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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15064) Possbile Bug in MultiByteBuffer
Date Tue, 05 Jan 2016 09:07:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15082673#comment-15082673

Hadoop QA commented on HBASE-15064:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against master branch at commit 9997e4ee52136a681faa825dea46bd1162d71eca.
  ATTACHMENT ID: 12780476

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

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified

    {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 2.6.1 2.7.0 2.7.1)

    {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:red}-1 checkstyle{color}.  The applied patch generated new checkstyle
errors. Check build console for list of new 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:red}-1 site{color}.  The patch appears to cause mvn post-site goal to fail.

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

    {color:green}+1 zombies{color}. No zombie tests found running at the end of the build.

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/17123//testReport/
Release Findbugs (version 2.0.3) 	warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/17123//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/17123//artifact/patchprocess/checkstyle-aggregate.html

                Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/17123//console

This message is automatically generated.

> Possbile Bug in MultiByteBuffer
> -------------------------------
>                 Key: HBASE-15064
>                 URL: https://issues.apache.org/jira/browse/HBASE-15064
>             Project: HBase
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 2.0.0
>            Reporter: deepankar
>            Assignee: Anoop Sam John
>            Priority: Critical
>             Fix For: 2.0.0
>         Attachments: HBASE-15064.patch
> While running the newer patches on our production system, I saw this error come couple
of times 
> {noformat}
> ipc.RpcServer: Unexpected throwable object 
> 2016-01-01 16:42:56,090 ERROR [B.defaultRpcServer.handler=20,queue=20,port=60020] ipc.RpcServer:
Unexpected throwable object 
> java.nio.BufferUnderflowException
> at java.nio.Buffer.nextGetIndex(Buffer.java:500)
> at java.nio.DirectByteBuffer.get(DirectByteBuffer.java:249)
> at org.apache.hadoop.hbase.nio.MultiByteBuff.get(MultiByteBuff.java:494)
> at org.apache.hadoop.hbase.io.encoding.FastDiffDeltaEncoder$1.decode(FastDiffDeltaEncoder.java:402)

> at org.apache.hadoop.hbase.io.encoding.FastDiffDeltaEncoder$1.decodeNext(FastDiffDeltaEncoder.java:517)

> at org.apache.hadoop.hbase.io.encoding.BufferedDataBlockEncoder$BufferedEncodedSeeker.next(BufferedDataBlockEncoder.java:815)
> at org.apache.hadoop.hbase.regionserver.StoreFileScanner.next(StoreFileScanner.java:138)
> {noformat}
> Looking at the get code 
> {code}
> if (this.curItem.remaining() == 0) {
>       if (items.length - 1 == this.curItemIndex) {
>         // means cur item is the last one and we wont be able to read a long. Throw exception
>         throw new BufferUnderflowException();
>       }
>       this.curItemIndex++;
>       this.curItem = this.items[this.curItemIndex];
>     }
> return this.curItem.get();
> {code}
> Can the new currentItem have zero elements (position == limit), does it make sense to
change the {{if}} to {{while}} ? {{while (this.curItem.remaining() == 0)}}. This logic is
repeated may make sense abstract to a new function if we plan to change to  {{if}} to {{while}}

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