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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13835) KeyValueHeap.current might be in heap when exception happens in pollRealKV
Date Thu, 25 Jun 2015 06:16:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14600764#comment-14600764
] 

Hadoop QA commented on HBASE-13835:
-----------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12741778/HBASE-13835_branch-1.patch
  against branch-1 branch at commit 2df3236a4eee48bf723213a7c4ff3d29c832c8cf.
  ATTACHMENT ID: 12741778

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 3 new or modified
tests.

    {color:green}+1 hadoop versions{color}. The patch compiles with all supported hadoop versions
(2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.0 2.7.0)

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 protoc{color}.  The applied patch does not increase the total number of
protoc compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 checkstyle{color}.  The applied patch does not increase the total number
of checkstyle errors

    {color:green}+1 findbugs{color}.  The patch does not introduce any  new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn post-site goal succeeds with this patch.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/14558//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/14558//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/14558//artifact/patchprocess/checkstyle-aggregate.html

  Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/14558//console

This message is automatically generated.

> KeyValueHeap.current might be in heap when exception happens in pollRealKV
> --------------------------------------------------------------------------
>
>                 Key: HBASE-13835
>                 URL: https://issues.apache.org/jira/browse/HBASE-13835
>             Project: HBase
>          Issue Type: Bug
>          Components: Scanners
>            Reporter: zhouyingchao
>            Assignee: zhouyingchao
>         Attachments: HBASE-13835-001.patch, HBASE-13835-002.patch, HBASE-13835-branch1-001.patch,
HBASE-13835_0.98.patch, HBASE-13835_branch-1.0.patch, HBASE-13835_branch-1.patch, HBASE-13835_branch-1.patch
>
>
> In a 0.94 hbase cluster, we found a NPE with following stack:
> {code}
> Exception in thread "regionserver21600.leaseChecker" java.lang.NullPointerException
>         at org.apache.hadoop.hbase.KeyValue$KVComparator.compare(KeyValue.java:1530)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap$KVScannerComparator.compare(KeyValueHeap.java:225)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap$KVScannerComparator.compare(KeyValueHeap.java:201)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap$KVScannerComparator.compare(KeyValueHeap.java:191)
>         at java.util.PriorityQueue.siftDownUsingComparator(PriorityQueue.java:641)
>         at java.util.PriorityQueue.siftDown(PriorityQueue.java:612)
>         at java.util.PriorityQueue.poll(PriorityQueue.java:523)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.close(KeyValueHeap.java:241)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.close(StoreScanner.java:355)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.close(KeyValueHeap.java:237)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.close(HRegion.java:4302)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer$ScannerListener.leaseExpired(HRegionServer.java:3033)
>         at org.apache.hadoop.hbase.regionserver.Leases.run(Leases.java:119)
>         at java.lang.Thread.run(Thread.java:662)
> {code}
> Before this NPE exception, there is an exception happens in pollRealKV, which we think
is the culprit of the NPE.
> {code}
> ERROR org.apache.hadoop.hbase.regionserver.HRegionServer:
> java.io.IOException: Could not reseek StoreFileScanner[HFileScanner for reader reader=....
>         at org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:180)
>         at org.apache.hadoop.hbase.regionserver.StoreFileScanner.enforceSeek(StoreFileScanner.java:371)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.pollRealKV(KeyValueHeap.java:366)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:116)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:455)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:154)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:4124)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:4196)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:4067)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:4057)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.internalNext(HRegionServer.java:2898)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:2833)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:2815)
>         at sun.reflect.GeneratedMethodAccessor38.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.SecureRpcEngine$Server.call(SecureRpcEngine.java:337)
>         at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1583)
> {code}
> Simply put, if there is an exception happens in pollRealKV( ), the KeyValueHeap.current
might be in heap. Later on, when KeyValueHeap.close( ) is called, the current would be closed
firstly. However, since it might still be in the heap, it would either be closed again or
its peek() (which is null after it is closed) is called by the heap's poll().  Neither case
is expected.
> Although it is caught in 0.94, it is still in the trunk from the code. 



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