Scala:Set（简介/常用方法示例）

最新推荐文章于 2024-04-18 15:06:20 发布
最新推荐文章于 2024-04-18 15:06:20 发布
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本文链接：https://blog.youkuaiyun.com/drl_blogs/article/details/91560826
本文深入探讨了Set和List的特性，解析了不可变Set的独特优势，以及可变ListBuffer的灵活性。强调了Set元素的唯一性和操作上的相似性，为读者提供了清晰的对比视角。

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Set

不可变 List：长度内容都不可变

可变 ListBuffer：长度内容都可变 必须导入包

创建set

set存储的元素都是唯一的，不重复的

注：操作与List相似

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/home/hadoopmaster/jdk1.8.0_161/jre/lib/charsets.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/deploy.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/ext/cldrdata.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/ext/dnsns.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/ext/jaccess.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/ext/jfxrt.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/ext/localedata.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/ext/nashorn.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/ext/sunec.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/ext/sunjce_provider.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/ext/sunpkcs11.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/ext/zipfs.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/javaws.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/jce.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/jfr.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/jfxswt.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/jsse.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/management-agent.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/plugin.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/resources.jar:/home/hadoopmaster/jdk1.8.0_161/jre/lib/rt.jar:/root/IdeaProjects/kkk/out/production/kkk:/home/hadoopmaster/scala-2.12.15/lib/scala-reflect.jar:/home/hadoopmaster/scala-2.12.15/lib/scala-xml_2.12-1.0.6.jar:/home/hadoopmaster/scala-2.12.15/lib/scala-parser-combinators_2.12-1.0.7.jar:/home/hadoopmaster/scala-2.12.15/lib/scala-swing_2.12-2.0.3.jar:/home/hadoopmaster/scala-2.12.15/lib/scala-library.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/xz-1.8.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jta-1.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jpam-1.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/json-1.8.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/ST4-4.0.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/guice-3.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/ivy-2.5.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/oro-2.0.8.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/blas-2.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/core-1.1.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/gson-2.2.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/tink-1.6.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/avro-1.10.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jsp-api-2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/okio-1.14.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/opencsv-2.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/shims-0.9.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/xmlenc-0.52.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/arpack-2.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/guava-14.0.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jetty-6.1.26.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jline-2.14.6.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jsr305-3.0.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/lapack-2.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/log4j-1.2.17.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/minlog-1.3.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/stream-2.9.6.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/velocity-1.5.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/generex-1.0.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hk2-api-2.6.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/janino-3.0.16.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jdo-api-3.0.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/objenesis-2.6.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/paranamer-2.8.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/py4j-0.10.9.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/pyrolite-4.30.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/HikariCP-2.5.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-io-2.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-cli-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/javax.inject-1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/libfb303-0.9.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/lz4-java-1.7.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/okhttp-3.12.12.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/snakeyaml-1.27.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/stax-api-1.0.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/JTransforms-3.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/aopalliance-1.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/avro-ipc-1.10.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/breeze_2.12-1.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-cli-1.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-net-3.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/derby-10.14.2.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-jdbc-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hk2-utils-2.6.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/httpcore-4.4.14.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jaxb-api-2.2.11.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jersey-hk2-2.34.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jodd-core-3.5.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/orc-core-1.6.12.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/super-csv-2.2.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/xml-apis-1.4.01.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/zookeeper-3.6.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/JLargeArrays-1.5.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/activation-1.1.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/automaton-1.11-8.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-dbcp-1.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-lang-2.6.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-text-1.6.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-serde-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-shims-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/javolution-5.5.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/libthrift-0.12.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/orc-shims-1.6.12.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/slf4j-api-1.7.30.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/zjsonpatch-0.3.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/zstd-jni-1.5.0-4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/chill-java-0.10.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/chill_2.12-0.10.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/guice-servlet-3.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-auth-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-hdfs-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-common-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hk2-locator-2.6.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/httpclient-4.5.13.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jackson-xc-1.9.13.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jetty-util-6.1.26.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/joda-time-2.10.10.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kryo-shaded-4.0.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/metrics-jmx-4.2.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/metrics-jvm-4.2.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/rocksdbjni-6.20.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spire_2.12-0.17.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/xercesImpl-2.12.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/aircompressor-0.21.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/algebra_2.12-2.0.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/annotations-17.0.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/antlr4-runtime-4.8.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/api-util-1.0.0-M20.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/arrow-format-2.0.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/arrow-vector-2.0.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/avro-mapred-1.10.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-codec-1.15.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-pool-1.5.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/compress-lzf-1.0.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-beeline-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/javax.jdo-3.2.0-m3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jaxb-runtime-2.3.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jersey-client-2.34.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jersey-common-2.34.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jersey-server-2.34.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/leveldbjni-all-1.8.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/metrics-core-4.2.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/metrics-json-4.2.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/RoaringBitmap-0.9.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/antlr-runtime-3.5.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-math3-3.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-client-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-common-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jackson-core-2.12.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/javassist-3.25.0-GA.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jul-to-slf4j-1.7.30.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/protobuf-java-2.5.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/snappy-java-1.1.8.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/transaction-api-1.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/bonecp-0.8.0.RELEASE.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-crypto-1.1.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-digester-1.8.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-lang3-3.12.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/curator-client-2.7.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-exec-2.3.9-core.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-metastore-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jackson-jaxrs-1.9.13.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jakarta.inject-2.6.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/orc-mapreduce-1.6.12.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/scala-xml_2.12-1.2.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/shapeless_2.12-2.3.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/slf4j-log4j12-1.7.30.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-sql_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/threeten-extra-1.5.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/zookeeper-jute-3.6.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-compress-1.21.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-logging-1.1.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/curator-recipes-2.7.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-yarn-api-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-shims-0.23-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jcl-over-slf4j-1.7.30.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/parquet-column-1.12.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/parquet-common-1.12.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/parquet-hadoop-1.12.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/scala-library-2.12.15.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/scala-reflect-2.12.15.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-core_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-hive_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-repl_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-tags_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-yarn_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/api-asn1-api-1.0.0-M20.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/breeze-macros_2.12-1.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/cats-kernel_2.12-2.1.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-httpclient-3.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/flatbuffers-java-1.9.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-llap-common-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-service-rpc-3.1.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-storage-api-2.7.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jetty-sslengine-6.1.26.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/metrics-graphite-4.2.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/netty-all-4.1.68.Final.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/parquet-jackson-1.12.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/scala-compiler-2.12.15.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-mesos_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-mllib_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spire-util_2.12-0.17.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/xbean-asm9-shaded-4.20.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/apacheds-i18n-2.0.0-M15.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/arpack_combined_all-0.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/arrow-memory-core-2.0.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-beanutils-1.9.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-compiler-3.0.16.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/curator-framework-2.7.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/datanucleus-core-4.1.17.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-shims-common-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jackson-core-asl-1.9.13.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jackson-databind-2.12.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jakarta.ws.rs-api-2.1.6.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-client-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/macro-compat_2.12-1.1.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/parquet-encoding-1.12.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-graphx_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-sketch_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-unsafe_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/univocity-parsers-2.9.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/arrow-memory-netty-2.0.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/datanucleus-rdbms-4.1.19.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-annotations-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-yarn-client-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-yarn-common-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-kvstore_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spire-macros_2.12-0.17.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-collections-3.2.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/commons-configuration-1.6.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/datanucleus-api-jdo-4.2.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jackson-mapper-asl-1.9.13.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jakarta.servlet-api-4.0.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/json4s-ast_2.12-3.7.0-M11.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-catalyst_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-launcher_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/audience-annotations-0.5.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-shims-scheduler-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hive-vector-code-gen-2.3.9.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jackson-annotations-2.12.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jakarta.xml.bind-api-2.3.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/json4s-core_2.12-3.7.0-M11.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-streaming_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spire-platform_2.12-0.17.0.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-apps-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-core-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-node-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-rbac-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/logging-interceptor-3.12.12.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/mesos-1.4.0-shaded-protobuf.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/osgi-resource-locator-1.0.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-kubernetes_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-tags_2.12-3.2.1-tests.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/aopalliance-repackaged-2.6.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/htrace-core-3.1.0-incubating.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/istack-commons-runtime-3.0.8.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jakarta.annotation-api-1.3.5.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jakarta.validation-api-2.0.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/json4s-scalap_2.12-3.7.0-M11.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-batch-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-mllib-local_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jersey-container-servlet-2.34.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/json4s-jackson_2.12-3.7.0-M11.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-common-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-events-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-policy-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jackson-dataformat-yaml-2.12.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jackson-datatype-jsr310-2.11.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-metrics-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-yarn-server-common-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-network-common_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jackson-module-scala_2.12-2.12.3.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-discovery-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/parquet-format-structures-1.12.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-network-shuffle_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/apacheds-kerberos-codec-2.0.0-M15.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-mapreduce-client-app-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-extensions-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-networking-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-scheduling-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-mapreduce-client-core-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-yarn-server-web-proxy-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/jersey-container-servlet-core-2.34.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-autoscaling-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-flowcontrol-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/scala-collection-compat_2.12-2.1.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/spark-hive-thriftserver_2.12-3.2.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-certificates-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-coordination-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-storageclass-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/scala-parser-combinators_2.12-1.1.2.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-mapreduce-client-common-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-apiextensions-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-mapreduce-client-shuffle-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/hadoop-mapreduce-client-jobclient-2.7.4.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/kubernetes-model-admissionregistration-5.4.1.jar:/home/hadoopmaster/spark-3.2.1-bin-hadoop2.7/jars/dropwizard-metrics-hadoop-metrics2-reporter-0.1.2.jar kkk.WordCount Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties 25/06/02 20:17:03 INFO SparkContext: Running Spark version 3.2.1 25/06/02 20:17:04 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 25/06/02 20:17:04 INFO ResourceUtils: ============================================================== 25/06/02 20:17:04 INFO ResourceUtils: No custom resources configured for spark.driver. 25/06/02 20:17:04 INFO ResourceUtils: ============================================================== 25/06/02 20:17:04 INFO SparkContext: Submitted application: WordCount 25/06/02 20:17:04 INFO ResourceProfile: Default ResourceProfile created, executor resources: Map(cores -> name: cores, amount: 1, script: , vendor: , memory -> name: memory, amount: 1024, script: , vendor: , offHeap -> name: offHeap, amount: 0, script: , vendor: ), task resources: Map(cpus -> name: cpus, amount: 1.0) 25/06/02 20:17:04 INFO ResourceProfile: Limiting resource is cpu 25/06/02 20:17:04 INFO ResourceProfileManager: Added ResourceProfile id: 0 25/06/02 20:17:04 INFO SecurityManager: Changing view acls to: root 25/06/02 20:17:04 INFO SecurityManager: Changing modify acls to: root 25/06/02 20:17:04 INFO SecurityManager: Changing view acls groups to: 25/06/02 20:17:04 INFO SecurityManager: Changing modify acls groups to: 25/06/02 20:17:04 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(root); groups with view permissions: Set(); users with modify permissions: Set(root); groups with modify permissions: Set() 25/06/02 20:17:05 INFO Utils: Successfully started service 'sparkDriver' on port 41615. 25/06/02 20:17:05 INFO SparkEnv: Registering MapOutputTracker 25/06/02 20:17:05 INFO SparkEnv: Registering BlockManagerMaster 25/06/02 20:17:05 INFO BlockManagerMasterEndpoint: Using org.apache.spark.storage.DefaultTopologyMapper for getting topology information 25/06/02 20:17:05 INFO BlockManagerMasterEndpoint: BlockManagerMasterEndpoint up 25/06/02 20:17:05 INFO SparkEnv: Registering BlockManagerMasterHeartbeat 25/06/02 20:17:05 INFO DiskBlockManager: Created local directory at /tmp/blockmgr-68486311-3f69-48e8-8f69-e7afffcf5979 25/06/02 20:17:05 INFO MemoryStore: MemoryStore started with capacity 258.5 MiB 25/06/02 20:17:05 INFO SparkEnv: Registering OutputCommitCoordinator 25/06/02 20:17:06 INFO Utils: Successfully started service 'SparkUI' on port 4040. 25/06/02 20:17:06 INFO SparkUI: Bound SparkUI to 0.0.0.0, and started at http://hadoopmaster:4040 25/06/02 20:17:06 INFO Executor: Starting executor ID driver on host hadoopmaster 25/06/02 20:17:06 INFO Utils: Successfully started service 'org.apache.spark.network.netty.NettyBlockTransferService' on port 41907. 25/06/02 20:17:06 INFO NettyBlockTransferService: Server created on hadoopmaster:41907 25/06/02 20:17:06 INFO BlockManager: Using org.apache.spark.storage.RandomBlockReplicationPolicy for block replication policy 25/06/02 20:17:06 INFO BlockManagerMaster: Registering BlockManager BlockManagerId(driver, hadoopmaster, 41907, None) 25/06/02 20:17:06 INFO BlockManagerMasterEndpoint: Registering block manager hadoopmaster:41907 with 258.5 MiB RAM, BlockManagerId(driver, hadoopmaster, 41907, None) 25/06/02 20:17:06 INFO BlockManagerMaster: Registered BlockManager BlockManagerId(driver, hadoopmaster, 41907, None) 25/06/02 20:17:06 INFO BlockManager: Initialized BlockManager: BlockManagerId(driver, hadoopmaster, 41907, None) 25/06/02 20:17:08 INFO MemoryStore: Block broadcast_0 stored as values in memory (estimated size 244.0 KiB, free 258.2 MiB) 25/06/02 20:17:09 INFO MemoryStore: Block broadcast_0_piece0 stored as bytes in memory (estimated size 23.4 KiB, free 258.2 MiB) 25/06/02 20:17:09 INFO BlockManagerInfo: Added broadcast_0_piece0 in memory on hadoopmaster:41907 (size: 23.4 KiB, free: 258.5 MiB) 25/06/02 20:17:09 INFO SparkContext: Created broadcast 0 from textFile at WordCount.scala:9 Exception in thread "main" org.apache.hadoop.mapred.InvalidInputException: Input path does not exist: file:/home/hadoopmaster/words.txt at org.apache.hadoop.mapred.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:287) at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:229) at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:315) at org.apache.spark.rdd.HadoopRDD.getPartitions(HadoopRDD.scala:205) at org.apache.spark.rdd.RDD.$anonfun$partitions$2(RDD.scala:300) at scala.Option.getOrElse(Option.scala:189) at org.apache.spark.rdd.RDD.partitions(RDD.scala:296) at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:49) at org.apache.spark.rdd.RDD.$anonfun$partitions$2(RDD.scala:300) at scala.Option.getOrElse(Option.scala:189) at org.apache.spark.rdd.RDD.partitions(RDD.scala:296) at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:49) at org.apache.spark.rdd.RDD.$anonfun$partitions$2(RDD.scala:300) at scala.Option.getOrElse(Option.scala:189) at org.apache.spark.rdd.RDD.partitions(RDD.scala:296) at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:49) at org.apache.spark.rdd.RDD.$anonfun$partitions$2(RDD.scala:300) at scala.Option.getOrElse(Option.scala:189) at org.apache.spark.rdd.RDD.partitions(RDD.scala:296) at org.apache.spark.Partitioner$.$anonfun$defaultPartitioner$4(Partitioner.scala:78) at org.apache.spark.Partitioner$.$anonfun$defaultPartitioner$4$adapted(Partitioner.scala:78) at scala.collection.immutable.List.map(List.scala:293) at org.apache.spark.Partitioner$.defaultPartitioner(Partitioner.scala:78) at org.apache.spark.rdd.PairRDDFunctions.$anonfun$reduceByKey$4(PairRDDFunctions.scala:322) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) at org.apache.spark.rdd.RDD.withScope(RDD.scala:414) at org.apache.spark.rdd.PairRDDFunctions.reduceByKey(PairRDDFunctions.scala:322) at kkk.WordCount$.main(WordCount.scala:10) at kkk.WordCount.main(WordCount.scala) 25/06/02 20:17:09 INFO SparkContext: Invoking stop() from shutdown hook 25/06/02 20:17:09 INFO SparkUI: Stopped Spark web UI at http://hadoopmaster:4040 25/06/02 20:17:09 INFO MapOutputTrackerMasterEndpoint: MapOutputTrackerMasterEndpoint stopped! 25/06/02 20:17:09 INFO MemoryStore: MemoryStore cleared 25/06/02 20:17:09 INFO BlockManager: BlockManager stopped 25/06/02 20:17:09 INFO BlockManagerMaster: BlockManagerMaster stopped 25/06/02 20:17:09 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint: OutputCommitCoordinator stopped! 25/06/02 20:17:10 INFO SparkContext: Successfully stopped SparkContext 25/06/02 20:17:10 INFO ShutdownHookManager: Shutdown hook called 25/06/02 20:17:10 INFO ShutdownHookManager: Deleting directory /tmp/spark-213e3a91-227c-4e0a-8254-ab5c0f00786d Process finished with exit code 1
06-04
用户可能是个Spark初学者，正在本地搭建环境测试WordCount示例。ta的困惑点在于：为什么教程里写的file://路径实际运行时报错？深层需求其实是理解Spark文件读取机制的核心差异——HDFS分布式存储vs本地文件系统。...
我这个是在Ubuntu运行sbt run发生的 root@Ubuntu:/home/rt/chisel-examples/hello-world# sbt run [info] welcome to sbt 1.10.11 (Ubuntu Java 21.0.6) [info] loading project definition from /home/rt/chisel-examples/hello-world/project [info] loading settings for project hello-world from build.sbt... [info] set current project to hello-world (in build file:/home/rt/chisel-examples/hello-world/) [info] compiling 1 Scala source to /home/rt/chisel-examples/hello-world/target/scala-2.12/classes ... [info] Non-compiled module 'compiler-bridge_2.12' for Scala 2.12.15. Compiling... error: bad constant pool index: 0 at pos: 48454emental 2s while compiling: <no file> during phase: globalPhase=<no phase>, enteringPhase=<some phase> library version: version 2.12.15 compiler version: version 2.12.15 reconstructed args: -bootclasspath /root/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.15/scala-library-2.12.15.jar -nowarn -classpath /root/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-sbt/compiler-interface/1.10.8/compiler-interface-1.10.8.jar:/root/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-sbt/util-interface/1.10.7/util-interface-1.10.7.jar:/root/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-sbt/compiler-bridge_2.12/1.10.8/compiler-bridge_2.12-1.10.8-sources.jar:/root/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.12.15/scala-compiler-2.12.15.jar:/root/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.12.15/scala-reflect-2.12.15.jar:/root/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-xml_2.12/1.0.6/scala-xml_2.12-1.0.6.jar:/root/.cache/coursier/v1/https/repo1.maven.org/maven2/jline/jline/2.14.6/jline-2.14.6.jar -d /tmp/sbt_bc12c207 -Xmaxwarns 0 last tree to typer: EmptyTree tree position: <unknown> tree tpe: <notype> symbol: null call site: <none> in <none> =
03-27
好的，我现在需要解决用户在Ubuntu上运行sbt时遇到的编译错误，具体是“bad constant pool index”问题，使用的Scala版本是2.12.15。首先，我需要理解这个错误的原因。 根据用户提供的引用内容，尤其是引用[2]提到...
scala> counts.saveAsTextFile("hdfs://Hadoop1:9000/wordcount/output/count") org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory hdfs://Hadoop1:9000/wordcount/output/count already exists at org.apache.hadoop.mapred.FileOutputFormat.checkOutputSpecs(FileOutputFormat.java:131) at org.apache.spark.internal.io.HadoopMapRedWriteConfigUtil.assertConf(SparkHadoopWriter.scala:299) at org.apache.spark.internal.io.SparkHadoopWriter$.write(SparkHadoopWriter.scala:71) at org.apache.spark.rdd.PairRDDFunctions.$anonfun$saveAsHadoopDataset$1(PairRDDFunctions.scala:1091) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) at org.apache.spark.rdd.RDD.withScope(RDD.scala:410) at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopDataset(PairRDDFunctions.scala:1089) at org.apache.spark.rdd.PairRDDFunctions.$anonfun$saveAsHadoopFile$4(PairRDDFunctions.scala:1062) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) at org.apache.spark.rdd.RDD.withScope(RDD.scala:410) at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopFile(PairRDDFunctions.scala:1027) at org.apache.spark.rdd.PairRDDFunctions.$anonfun$saveAsHadoopFile$3(PairRDDFunctions.scala:1009) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) at org.apache.spark.rdd.RDD.withScope(RDD.scala:410) at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopFile(PairRDDFunctions.scala:1008) at org.apache.spark.rdd.PairRDDFunctions.$anonfun$saveAsHadoopFile$2(PairRDDFunctions.scala:965) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) at org.apache.spark.rdd.RDD.withScope(RDD.scala:410) at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopFile(PairRDDFunctions.scala:963) at org.apache.spark.rdd.RDD.$anonfun$saveAsTextFile$2(RDD.scala:1623) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) at org.apache.spark.rdd.RDD.withScope(RDD.scala:410) at org.apache.spark.rdd.RDD.saveAsTextFile(RDD.scala:1623) at org.apache.spark.rdd.RDD.$anonfun$saveAsTextFile$1(RDD.scala:1609) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) at org.apache.spark.rdd.RDD.withScope(RDD.scala:410) at org.apache.spark.rdd.RDD.saveAsTextFile(RDD.scala:1609) ... 42 elided \
03-08
此外，用户可能对HDFS操作不太熟悉，需要提供具体的命令示例，比如如何通过命令行或代码删除目录。同时，需要提醒用户谨慎操作，避免误删数据。 最后，我应该总结这两种方法，并建议用户首选先删除目录，或者在代码...
root@hadoop01 apache-hive-3.1.3-bin]# bin/hive which: no hbase in (:/export/servers/apache-hive-3.1.3-bin/bin:/export/servers/flume-1.9.0/bin:/export/servers/hadoop-3.3.5/bin::/export/servers/apache-hive-3.1.3-bin/bin:/export/servers/flume-1.9.0/bin::/export/servers/apache-hive-3.1.3-bin/bin:/export/servers/flume-1.9.0/bin:/export/servers/flume-1.9.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/export/servers/jdk1.8.0_161/bin:/export/servers/hadoop-3.3.5/bin:/export/servers/hadoop-3.3.5/sbin:/export/servers/scala-2.12.10/bin:/root/bin:/export/servers/jdk1.8.0_161/bin:/export/servers/hadoop-3.3.5/bin:/export/servers/hadoop-3.3.5/sbin:/export/servers/scala-2.12.10/bin:/export/servers/jdk1.8.0_161/bin:/export/servers/hadoop-3.3.5/bin:/export/servers/hadoop-3.3.5/sbin:/export/servers/scala-2.12.10/bin:/root/bin:/export/servers/jdk1.8.0_161/bin:/export/servers/hadoop-3.3.5/bin:/export/servers/hadoop-3.3.5/sbin:/export/servers/scala-2.12.10/bin:/export/servers/sqoop/bin:) 2025-06-17 18:31:23,734 INFO conf.HiveConf: Found configuration file file:/export/servers/apache-hive-3.1.3-bin/conf/hive-site.xml Hive Session ID = 1bb412dc-6394-489e-80ca-943bacb068f6 2025-06-17 18:31:29,776 INFO SessionState: Hive Session ID = 1bb412dc-6394-489e-80ca-943bacb068f6 Logging initialized using configuration in jar:file:/export/servers/apache-hive-3.1.3-bin/lib/hive-common-3.1.3.jar!/hive-log4j2.properties Async: true 2025-06-17 18:31:29,920 INFO SessionState: Logging initialized using configuration in jar:file:/export/servers/apache-hive-3.1.3-bin/lib/hive-common-3.1.3.jar!/hive-log4j2.properties Async: true 2025-06-17 18:31:33,217 INFO session.SessionState: Created HDFS directory: /tmp/hive/root/1bb412dc-6394-489e-80ca-943bacb068f6 2025-06-17 18:31:33,267 INFO session.SessionState: Created local directory: /tmp/root/1bb412dc-6394-489e-80ca-943bacb068f6 2025-06-17 18:31:33,280 INFO session.SessionState: Created HDFS directory: /tmp/hive/root/1bb412dc-6394-489e-80ca-943bacb068f6/_tmp_space.db 2025-06-17 18:31:33,323 INFO conf.HiveConf: Using the default value passed in for log id: 1bb412dc-6394-489e-80ca-943bacb068f6 2025-06-17 18:31:33,323 INFO session.SessionState: Updating thread name to 1bb412dc-6394-489e-80ca-943bacb068f6 main 2025-06-17 18:31:35,971 INFO metastore.HiveMetaStore: 0: Opening raw store with implementation class:org.apache.hadoop.hive.metastore.ObjectStore 2025-06-17 18:31:36,007 WARN metastore.ObjectStore: datanucleus.autoStartMechanismMode is set to unsupported value null . Setting it to value: ignored 2025-06-17 18:31:36,017 INFO metastore.ObjectStore: ObjectStore, initialize called 2025-06-17 18:31:36,019 INFO conf.MetastoreConf: Found configuration file file:/export/servers/apache-hive-3.1.3-bin/conf/hive-site.xml 2025-06-17 18:31:36,021 INFO conf.MetastoreConf: Unable to find config file hivemetastore-site.xml 2025-06-17 18:31:36,021 INFO conf.MetastoreConf: Found configuration file null 2025-06-17 18:31:36,023 INFO conf.MetastoreConf: Unable to find config file metastore-site.xml 2025-06-17 18:31:36,023 INFO conf.MetastoreConf: Found configuration file null 2025-06-17 18:31:36,357 INFO DataNucleus.Persistence: Property datanucleus.cache.level2 unknown - will be ignored 2025-06-17 18:31:36,899 INFO hikari.HikariDataSource: HikariPool-1 - Starting... 2025-06-17 18:31:37,442 INFO hikari.HikariDataSource: HikariPool-1 - Start completed. 2025-06-17 18:31:37,532 INFO hikari.HikariDataSource: HikariPool-2 - Starting... 2025-06-17 18:31:37,674 INFO hikari.HikariDataSource: HikariPool-2 - Start completed. 2025-06-17 18:31:38,661 INFO metastore.ObjectStore: Setting MetaStore object pin classes with hive.metastore.cache.pinobjtypes="Table,StorageDescriptor,SerDeInfo,Partition,Database,Type,FieldSchema,Order" 2025-06-17 18:31:39,025 INFO metastore.MetaStoreDirectSql: Using direct SQL, underlying DB is MYSQL 2025-06-17 18:31:39,031 INFO metastore.ObjectStore: Initialized ObjectStore 2025-06-17 18:31:39,705 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:39,706 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:39,707 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:39,707 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:39,708 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:39,709 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:43,370 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:43,371 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:43,372 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:43,372 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:43,372 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:43,372 WARN DataNucleus.MetaData: Metadata has jdbc-type of null yet this is not valid. Ignored 2025-06-17 18:31:48,380 WARN metastore.ObjectStore: Version information not found in metastore. metastore.schema.verification is not enabled so recording the schema version 3.1.0 2025-06-17 18:31:48,380 WARN metastore.ObjectStore: setMetaStoreSchemaVersion called but recording version is disabled: version = 3.1.0, comment = Set by MetaStore root@192.168.245.131 2025-06-17 18:31:48,917 INFO metastore.HiveMetaStore: Added admin role in metastore 2025-06-17 18:31:48,922 INFO metastore.HiveMetaStore: Added public role in metastore 2025-06-17 18:31:49,028 INFO metastore.HiveMetaStore: No user is added in admin role, since config is empty 2025-06-17 18:31:49,426 INFO metastore.RetryingMetaStoreClient: RetryingMetaStoreClient proxy=class org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient ugi=root (auth:SIMPLE) retries=1 delay=1 lifetime=0 2025-06-17 18:31:49,471 INFO metastore.HiveMetaStore: 0: get_all_functions 2025-06-17 18:31:49,474 INFO HiveMetaStore.audit: ugi=root ip=unknown-ip-addr cmd=get_all_functions Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases. 2025-06-17 18:31:49,645 INFO CliDriver: Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases. Hive Session ID = 4bd9c9da-8eb4-44a2-948e-faa5053d60f3 2025-06-17 18:31:49,645 INFO SessionState: Hive Session ID = 4bd9c9da-8eb4-44a2-948e-faa5053d60f3 2025-06-17 18:31:49,697 INFO session.SessionState: Created HDFS directory: /tmp/hive/root/4bd9c9da-8eb4-44a2-948e-faa5053d60f3 2025-06-17 18:31:49,703 INFO session.SessionState: Created local directory: /tmp/root/4bd9c9da-8eb4-44a2-948e-faa5053d60f3 2025-06-17 18:31:49,710 INFO session.SessionState: Created HDFS directory: /tmp/hive/root/4bd9c9da-8eb4-44a2-948e-faa5053d60f3/_tmp_space.db 2025-06-17 18:31:49,713 INFO metastore.HiveMetaStore: 1: get_databases: @hive# 2025-06-17 18:31:49,714 INFO HiveMetaStore.audit: ugi=root ip=unknown-ip-addr cmd=get_databases: @hive# 2025-06-17 18:31:49,716 INFO metastore.HiveMetaStore: 1: Opening raw store with implementation class:org.apache.hadoop.hive.metastore.ObjectStore 2025-06-17 18:31:49,720 INFO metastore.ObjectStore: ObjectStore, initialize called 2025-06-17 18:31:49,755 INFO metastore.MetaStoreDirectSql: Using direct SQL, underlying DB is MYSQL 2025-06-17 18:31:49,756 INFO metastore.ObjectStore: Initialized ObjectStore 2025-06-17 18:31:49,768 INFO metastore.HiveMetaStore: 1: get_tables_by_type: db=@hive#db_hive1 pat=.*,type=MATERIALIZED_VIEW 2025-06-17 18:31:49,769 INFO HiveMetaStore.audit: ugi=root ip=unknown-ip-addr cmd=get_tables_by_type: db=@hive#db_hive1 pat=.*,type=MATERIALIZED_VIEW 2025-06-17 18:31:49,789 INFO metastore.HiveMetaStore: 1: get_multi_table : db=db_hive1 tbls= 2025-06-17 18:31:49,793 INFO HiveMetaStore.audit: ugi=root ip=unknown-ip-addr cmd=get_multi_table : db=db_hive1 tbls= 2025-06-17 18:31:49,795 INFO metastore.HiveMetaStore: 1: get_tables_by_type: db=@hive#default pat=.*,type=MATERIALIZED_VIEW 2025-06-17 18:31:49,796 INFO HiveMetaStore.audit: ugi=root ip=unknown-ip-addr cmd=get_tables_by_type: db=@hive#default pat=.*,type=MATERIALIZED_VIEW 2025-06-17 18:31:49,803 INFO metastore.HiveMetaStore: 1: get_multi_table : db=default tbls= 2025-06-17 18:31:49,803 INFO HiveMetaStore.audit: ugi=root ip=unknown-ip-addr cmd=get_multi_table : db=default tbls= 2025-06-17 18:31:49,803 INFO metadata.HiveMaterializedViewsRegistry: Materialized views registry has been initialized hive>
最新发布
06-18
- **日志示例**：启动日志中可能显示类似 `WARN: HBase jar is not found in classpath. Skipping HBase integration.` 的信息。 - **"jdbc-type null" 警告**： - **含义**：这表示 Hive 在初始化 JDBC 连接时，...
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Scala Set(集合)是没有重复的对象集合，所有的元素都是唯一的。 Scala 集合分为可变的和不可变的集合。 默认情况下，Scala 使用的是不可变集合，如果你想使用可变集合，需要引用scala.collection.mutable.Set包。 默认引用 scala.collection.immutable.Set，不可变集合实例如下： 1.定义： var set1 =Set(1,"一",2,"er") set1.foreach(x => println(x)) 输出： ...
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不可变Set 创建Set scala&gt; val a=Set(1,1,2,3) a: scala.collection.immutable.Set[Int] = Set(1, 2, 3) 添加元素 scala&gt; a+(4) res119: scala.collection.immutable.Set[Int] = Set(1, 2, 3, 4) scala&gt; a...
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