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https://issues.apache.org/jira/browse/HDFS-3600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brahma Reddy Battula resolved HDFS-3600.
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Resolution: Not A Problem
> DataNode is not responding After throwing java.lang.OutOfMemoryError: Direct
> buffer memory
> ------------------------------------------------------------------------------------------
>
> Key: HDFS-3600
> URL: https://issues.apache.org/jira/browse/HDFS-3600
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 2.1.0-alpha
> Reporter: Brahma Reddy Battula
>
> Scenario:
> =========
> Started NN with four DN's
> written client program such that it will keep on write,append and read dta
> with 10 thread.
> After 4 hours ,got OOME.Then DN listed under Dead it's not sending any
> heartbeats but GC is happening.
> *GC OPTS configured for DN*
> -Xms3G -Xmx4G -XX:NewSize=256M -XX:MaxNewSize=512M -XX:PermSize=128M
> -XX:MaxPermSize=128M -XX:CMSFullGCsBeforeCompaction=1
> -XX:MaxDirectMemorySize=1G -XX:+UseConcMarkSweepGC
> -XX:+CMSParallelRemarkEnabled -XX:+UseCMSCompactAtFullCollection
> -XX:CMSInitiatingOccupancyFraction=65
> -Xloggc:/home/install/hadoop/datanode/logs/datanode-root-gc.log
> -XX:+PrintGCDetails -XX:+DisableExplicitGC
>
> *CPU usage for DN*
> {noformat}
> Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
> Cpu(s): 0.1%us, 0.0%sy, 0.0%ni, 99.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
> Mem: 15955M total, 15806M used, 148M free, 436M buffers
> Swap: 12284M total, 9M used, 12274M free, 11422M cached
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
>
> 7431 root 20 0 6291m 2.6g 13m S 0 16.4 55:20.65 java
> {noformat}
> *JAVA Version*
> {noformat}
> sun.boot.library.path = /root/nodesetup/java/jdk1.6.0_31/jre/lib/amd64
> java version "1.6.0_31"
> Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
> Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)
> {noformat}
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