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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1555) some java "concurrent" structures may not be so much after all!
Date Sun, 21 Jun 2009 07:42:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722312#action_12722312
] 

ryan rawson commented on HBASE-1555:
------------------------------------

i have been unable to cause this to happen again since i fixed 1558... Its a very strange/impossible
situation!

this was 1.6u14

> some java "concurrent" structures may not be so much after all!
> ---------------------------------------------------------------
>
>                 Key: HBASE-1555
>                 URL: https://issues.apache.org/jira/browse/HBASE-1555
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>            Reporter: ryan rawson
>             Fix For: 0.20.0
>
>
> during a huge import (high concurrenty, 56 writers) I have seen:
> java.io.IOException: java.lang.NullPointerException
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.convertThrowableToIOE(HRegionServer.java:832)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.convertThrowableToIOE(HRegionServer.java:822)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.put(HRegionServer.java:1775)
>         at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:643)
>         at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:913)
> Caused by: java.lang.NullPointerException
>         at java.util.concurrent.ConcurrentHashMap$Segment.put(ConcurrentHashMap.java:426)
>         at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:883)
>         at org.apache.hadoop.hbase.regionserver.HRegion.obtainRowLock(HRegion.java:1557)
>         at org.apache.hadoop.hbase.regionserver.HRegion.getLock(HRegion.java:1610)
>         at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1225)
>         at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1197)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.put(HRegionServer.java:1768)
>         ... 5 more
> 2009-06-19 20:13:55,672 ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: java.lang.NullPointerException
> 2009-06-19 20:13:55,672 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 5
on 60020, call put([B@3160e069, [Lorg.apache.hadoop.hbase.client.Put;@4f2d26d2) from 10.10.20.226
> :38741: error: java.io.IOException: java.lang.NullPointerException
> java.io.IOException: java.lang.NullPointerException
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.convertThrowableToIOE(HRegionServer.java:832)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.convertThrowableToIOE(HRegionServer.java:822)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.put(HRegionServer.java:1775)
>         at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:643)
>         at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:913)
> Caused by: java.lang.NullPointerException
>         at java.util.concurrent.ConcurrentHashMap$Segment.put(ConcurrentHashMap.java:426)
>         at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:883)
>         at org.apache.hadoop.hbase.regionserver.HRegion.obtainRowLock(HRegion.java:1557)
>         at org.apache.hadoop.hbase.regionserver.HRegion.getLock(HRegion.java:1610)
>         at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1225)
>         at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1197)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.put(HRegionServer.java:1768)
>         ... 5 more

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