2025-06-17 16:57:49,871 INFO zookeeper.ZooKeeper: Client environment:java.library.path=/opt/hadoop-3.3.2/lib/native
2025-06-17 16:57:49,871 INFO zookeeper.ZooKeeper: Client environment:java.io.tmpdir=/tmp
2025-06-17 16:57:49,871 INFO zookeeper.ZooKeeper: Client environment:java.compiler=<NA>
2025-06-17 16:57:49,871 INFO zookeeper.ZooKeeper: Client environment:os.name=Linux
2025-06-17 16:57:49,871 INFO zookeeper.ZooKeeper: Client environment:os.arch=amd64
2025-06-17 16:57:49,871 INFO zookeeper.ZooKeeper: Client environment:os.version=3.10.0-862.el7.x86_64
2025-06-17 16:57:49,871 INFO zookeeper.ZooKeeper: Client environment:user.name=root
2025-06-17 16:57:49,871 INFO zookeeper.ZooKeeper: Client environment:user.home=/root
2025-06-17 16:57:49,872 INFO zookeeper.ZooKeeper: Client environment:user.dir=/root
2025-06-17 16:57:49,872 INFO zookeeper.ZooKeeper: Client environment:os.memory.free=92MB
2025-06-17 16:57:49,872 INFO zookeeper.ZooKeeper: Client environment:os.memory.max=235MB
2025-06-17 16:57:49,872 INFO zookeeper.ZooKeeper: Client environment:os.memory.total=176MB
2025-06-17 16:57:49,873 INFO zookeeper.ZooKeeper: Initiating client connection, connectString=hh1:2181,hh2:2181,hh3:2181 sessionTimeout=90000 watcher=org.apache.hadoop.hbase.zookeeper.PendingWatcher@45843650
2025-06-17 16:57:49,881 INFO common.X509Util: Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation
2025-06-17 16:57:49,889 INFO zookeeper.ClientCnxnSocket: jute.maxbuffer value is 4194304 Bytes
2025-06-17 16:57:49,893 INFO zookeeper.ClientCnxn: zookeeper.request.timeout value is 0. feature enabled=
2025-06-17 16:57:49,912 INFO zookeeper.ClientCnxn: Opening socket connection to server hh3/192.168.222.152:2181. Will not attempt to authenticate using SASL (unknown error)
2025-06-17 16:57:49,935 INFO zookeeper.ClientCnxn: Socket connection established, initiating session, client: /192.168.222.150:34352, server: hh3/192.168.222.152:2181
2025-06-17 16:57:49,943 INFO zookeeper.ClientCnxn: Session establishment complete on server hh3/192.168.222.152:2181, sessionid = 0x30000016e820006, negotiated timeout = 40000
2025-06-17 16:57:50,945 INFO client.ConnectionManager$HConnectionImplementation: Closing master protocol: MasterService
2025-06-17 16:57:50,945 INFO client.ConnectionManager$HConnectionImplementation: Closing zookeeper sessionid=0x30000016e820006
2025-06-17 16:57:51,051 ERROR zookeeper.ClientCnxn: Error while calling watcher
java.lang.IllegalStateException: Received event is not valid: Closed
at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.connectionEvent(ZooKeeperWatcher.java:707)
at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:629)
at org.apache.hadoop.hbase.zookeeper.PendingWatcher.process(PendingWatcher.java:40)
at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:535)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)
2025-06-17 16:57:51,053 INFO zookeeper.ZooKeeper: Session: 0x30000016e820006 closed
2025-06-17 16:57:51,053 INFO zookeeper.ClientCnxn: EventThread shut down for session: 0x30000016e820006
2025-06-17 16:57:51,097 WARN mapreduce.TableMapReduceUtil: The addDependencyJars(Configuration, Class<?>...) method has been deprecated since it is easy to use incorrectly. Most users should rely on addDependencyJars(Job) instead. See HBASE-8386 for more details.
2025-06-17 16:57:51,170 INFO client.DefaultNoHARMFailoverProxyProvider: Connecting to ResourceManager at hh1/192.168.222.150:8032
2025-06-17 16:57:51,639 INFO mapreduce.JobResourceUploader: Disabling Erasure Coding for path: /tmp/hadoop-yarn/staging/root/.staging/job_1750149645829_0003
2025-06-17 16:57:59,695 INFO db.DBInputFormat: Using read commited transaction isolation
2025-06-17 16:57:59,726 INFO mapreduce.JobSubmitter: number of splits:1
2025-06-17 16:57:59,760 INFO Configuration.deprecation: yarn.resourcemanager.system-metrics-publisher.enabled is deprecated. Instead, use yarn.system-metrics-publisher.enabled
2025-06-17 16:57:59,943 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1750149645829_0003
2025-06-17 16:57:59,943 INFO mapreduce.JobSubmitter: Executing with tokens: []
2025-06-17 16:58:00,196 INFO conf.Configuration: resource-types.xml not found
2025-06-17 16:58:00,197 INFO resource.ResourceUtils: Unable to find 'resource-types.xml'.
2025-06-17 16:58:00,270 INFO impl.YarnClientImpl: Submitted application application_1750149645829_0003
2025-06-17 16:58:00,297 INFO mapreduce.Job: The url to track the job: http://hh1:8088/proxy/application_1750149645829_0003/
2025-06-17 16:58:00,298 INFO mapreduce.Job: Running job: job_1750149645829_0003
2025-06-17 16:58:10,403 INFO mapreduce.Job: Job job_1750149645829_0003 running in uber mode : false
2025-06-17 16:58:10,405 INFO mapreduce.Job: map 0% reduce 0%
2025-06-17 16:58:10,415 INFO mapreduce.Job: Job job_1750149645829_0003 failed with state FAILED due to: Application application_1750149645829_0003 failed 2 times due to AM Container for appattempt_1750149645829_0003_000002 exited with exitCode: 1
Failing this attempt.Diagnostics: [2025-06-17 16:58:10.181]Exception from container-launch.
Container id: container_1750149645829_0003_02_000001
Exit code: 1
[2025-06-17 16:58:10.183]Container exited with a non-zero exit code 1. Error file: prelaunch.err.
Last 4096 bytes of prelaunch.err :
Last 4096 bytes of stderr :
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/hadoop-3.3.2/share/hadoop/common/lib/slf4j-log4j12-1.7.30.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/tmp/hadoop/nm-local-dir/usercache/root/filecache/12/libjars/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
log4j:WARN No appenders could be found for logger (org.apache.hadoop.mapreduce.v2.app.MRAppMaster).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[2025-06-17 16:58:10.184]Container exited with a non-zero exit code 1. Error file: prelaunch.err.
Last 4096 bytes of prelaunch.err :
Last 4096 bytes of stderr :
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/hadoop-3.3.2/share/hadoop/common/lib/slf4j-log4j12-1.7.30.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/tmp/hadoop/nm-local-dir/usercache/root/filecache/12/libjars/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
log4j:WARN No appenders could be found for logger (org.apache.hadoop.mapreduce.v2.app.MRAppMaster).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
For more detailed output, check the application tracking page: http://hh1:8088/cluster/app/application_1750149645829_0003 Then click on links to logs of each attempt.
. Failing the application.
2025-06-17 16:58:10,462 INFO mapreduce.Job: Counters: 0
2025-06-17 16:58:10,475 WARN mapreduce.Counters: Group FileSystemCounters is deprecated. Use org.apache.hadoop.mapreduce.FileSystemCounter instead
2025-06-17 16:58:10,478 INFO mapreduce.ImportJobBase: Transferred 0 bytes in 19.3693 seconds (0 bytes/sec)
2025-06-17 16:58:10,486 WARN mapreduce.Counters: Group org.apache.hadoop.mapred.Task$Counter is deprecated. Use org.apache.hadoop.mapreduce.TaskCounter instead
2025-06-17 16:58:10,487 INFO mapreduce.ImportJobBase: Retrieved 0 records.
2025-06-17 16:58:10,487 ERROR tool.ImportTool: Import failed: Import job failed!
[root@hh1 ~]#
本文介绍了一个常见的 ZooKeeper 错误——当客户端尝试建立的连接数超过默认的最大值10时，会触发错误。文章给出了通过设置 maxClientCnxns 参数为 0 来解除这一限制的方法，并提醒读者为了防止潜在的 DOS 攻击，应当根据实际情况合理调整该参数。
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