重启hdfs集群的时候，报大量的gc问题。

最新推荐文章于 2025-02-27 13:33:41 发布

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最新推荐文章于 2025-02-27 13:33:41 发布

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文章标签： java 大数据

原文链接：http://www.cnblogs.com/yjt1993/p/10510113.html

在重启HDFS集群时遇到大量GC问题，表现为特定错误日志。解决方法包括调整hadoop-env.sh文件中的HADOOP_HEAPSIZE和HADOOP_NAMENODE_INIT_HEAPSIZE参数，视情况增大内存分配，如从1000m调整到更高。如果问题依然存在，可进一步修改HADOOP_NAMENODE_OPTS以优化配置。

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问题现象：

2019-03-11 12:30:52,174 INFO org.apache.hadoop.util.JvmPauseMonitor: Detected pause in JVM or host machine (eg GC): pause of approximately 7653ms
GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=7692ms
2019-03-11 12:31:00,573 INFO org.apache.hadoop.util.JvmPauseMonitor: Detected pause in JVM or host machine (eg GC): pause of approximately 7899ms
GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=7951ms
2019-03-11 12:31:08,952 INFO org.apache.hadoop.util.JvmPauseMonitor: Detected pause in JVM or host machine (eg GC): pause of approximately 7878ms
GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=7937ms
2019-03-11 12:31:17,405 INFO org.apache.hadoop.util.JvmPauseMonitor: Detected pause in JVM or host machine (eg GC): pause of approximately 7951ms
GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=8037ms
2019-03-11 12:31:26,611 INFO org.apache.hadoop.util.JvmPauseMonitor: Detected pause in JVM or host machine (eg GC): pause of approximately 8705ms
GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=8835ms
2019-03-11 12:31:35,009 INFO org.apache.hadoop.util.JvmPauseMonitor: Detected pause in JVM or host machine (eg GC): pause of approximately 7897ms
GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=8083ms
2019-03-11 12:31:43,806 INFO org.apache.hadoop.util.JvmPauseMonitor: Detected pause in JVM or host machine (eg GC): pause of approximately 8296ms
GC pool 'ConcurrentMarkSweep' had collection(s): count=1 time=8416ms
2019-03-11 12:31:52,317 INFO org.apache.hadoop.util.JvmPauseMonitor: Detected pause in JVM or host machine (eg GC): pause of approximately 8010ms
GC pool