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https://issues.apache.org/jira/browse/HADOOP-10143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13878649#comment-13878649
]
Hudson commented on HADOOP-10143:
---------------------------------
SUCCESS: Integrated in Hadoop-Hdfs-trunk #1652 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1652/])
Move HADOOP-10143 to 2.4 section of CHANGES.txt (wang:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1560222)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
> replace WritableFactories's hashmap with ConcurrentHashMap
> ----------------------------------------------------------
>
> Key: HADOOP-10143
> URL: https://issues.apache.org/jira/browse/HADOOP-10143
> Project: Hadoop Common
> Issue Type: Improvement
> Components: io
> Affects Versions: 2.0.0-alpha, 2.2.0
> Reporter: Liang Xie
> Assignee: Liang Xie
> Fix For: 3.0.0, 2.4.0
>
> Attachments: HADOOP-10143.txt
>
>
> We observed a lock contend hotspot from a HBase cluster:
> "IPC Reader 9 on port 12600" daemon prio=10 tid=0x00007f85b8aceed0 nid=0x4be8
> waiting for monitor entry [0x00007f8501c57000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.hadoop.io.WritableFactories.getFactory(WritableFactories.java:44)
> - locked <0x00000007fd1328a8> (a java.lang.Class for
> org.apache.hadoop.io.WritableFactories)
> at
> org.apache.hadoop.io.WritableFactories.newInstance(WritableFactories.java:49)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:680)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:586)
> at
> org.apache.hadoop.hbase.client.MultiAction.readFields(MultiAction.java:116)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:682)
> at
> org.apache.hadoop.hbase.ipc.Invocation.readFields(Invocation.java:126)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.processData(SecureServer.java:618)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.processOneRpc(SecureServer.java:596)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.saslReadAndProcess(SecureServer.java:362)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.readAndProcess(SecureServer.java:492)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:770)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.doRunLoop(HBaseServer.java:561)
> - locked <0x000000043da3fea0> (a
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:536)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> "IPC Reader 7 on port 12600" daemon prio=10 tid=0x00007f85b8a99df0 nid=0x4be6
> waiting for monitor entry [0x00007f8501cd9000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.hadoop.io.WritableFactories.getFactory(WritableFactories.java:44)
> - locked <0x00000007fd1328a8> (a java.lang.Class for
> org.apache.hadoop.io.WritableFactories)
> at
> org.apache.hadoop.io.WritableFactories.newInstance(WritableFactories.java:49)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:680)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:586)
> at
> org.apache.hadoop.hbase.client.MultiAction.readFields(MultiAction.java:116)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:682)
> at
> org.apache.hadoop.hbase.ipc.Invocation.readFields(Invocation.java:126)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.processData(SecureServer.java:618)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.processOneRpc(SecureServer.java:596)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.saslReadAndProcess(SecureServer.java:362)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.readAndProcess(SecureServer.java:492)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:770)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.doRunLoop(HBaseServer.java:561)
> - locked <0x000000043da232e8> (a
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:536)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> "IPC Reader 5 on port 12600" daemon prio=10 tid=0x00007f85b8a64d40 nid=0x4be2
> runnable [0x00007f8501d5b000]
> java.lang.Thread.State: RUNNABLE
> at
> org.apache.hadoop.io.WritableFactories.getFactory(WritableFactories.java:44)
> - locked <0x00000007fd1328a8> (a java.lang.Class for
> org.apache.hadoop.io.WritableFactories)
> at
> org.apache.hadoop.io.WritableFactories.newInstance(WritableFactories.java:49)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:680)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:586)
> at org.apache.hadoop.hbase.client.Action.readFields(Action.java:103)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:682)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:586)
> at
> org.apache.hadoop.hbase.client.MultiAction.readFields(MultiAction.java:116)
> at
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:682)
> at
> org.apache.hadoop.hbase.ipc.Invocation.readFields(Invocation.java:126)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.processData(SecureServer.java:618)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.processOneRpc(SecureServer.java:596)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.saslReadAndProcess(SecureServer.java:362)
> at
> org.apache.hadoop.hbase.ipc.SecureServer$SecureConnection.readAndProcess(SecureServer.java:492)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:770)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.doRunLoop(HBaseServer.java:561)
> - locked <0x000000043da27300> (a
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:536)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> All those three threads just wanted to get/read the factory, so to me, it
> looks like a perfect use case for ConcurrentHashMap here.
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