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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6846) BitComparator bug - ArrayIndexOutOfBoundsException
Date Sat, 27 Oct 2012 04:33:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485352#comment-13485352
] 

Hadoop QA commented on HBASE-6846:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12551053/6846-trunk.txt
  against trunk revision .

    {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 hadoop2.0{color}.  The patch compiles against the hadoop 2.0 profile.

    {color:red}-1 javadoc{color}.  The javadoc tool appears to have generated 85 warning messages.

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

    {color:red}-1 findbugs{color}.  The patch appears to introduce 3 new Findbugs (version
1.3.9) warnings.

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

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.client.TestMultiParallel

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/3164//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/3164//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/3164//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/3164//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/3164//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/3164//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/3164//console

This message is automatically generated.
                
> BitComparator bug - ArrayIndexOutOfBoundsException
> --------------------------------------------------
>
>                 Key: HBASE-6846
>                 URL: https://issues.apache.org/jira/browse/HBASE-6846
>             Project: HBase
>          Issue Type: Bug
>          Components: Filters
>    Affects Versions: 0.94.1
>         Environment: HBase 0.94.1 + Hadoop 2.0.0-cdh4.0.1
>            Reporter: Lucian George Iordache
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.3, 0.96.0
>
>         Attachments: 6846-trunk.txt, HBASE-6846.patch
>
>
> The HBase 0.94.1 BitComparator introduced a bug in the method "compareTo":
> {code}
> @Override
>   public int compareTo(byte[] value, int offset, int length) {
>     if (length != this.value.length) {
>       return 1;
>     }
>     int b = 0;
>     //Iterating backwards is faster because we can quit after one non-zero byte.
>     for (int i = value.length - 1; i >= 0 && b == 0; i--) {
>       switch (bitOperator) {
>         case AND:
>           b = (this.value[i] & value[i+offset]) & 0xff;
>           break;
>         case OR:
>           b = (this.value[i] | value[i+offset]) & 0xff;
>           break;
>         case XOR:
>           b = (this.value[i] ^ value[i+offset]) & 0xff;
>           break;
>       }
>     }
>     return b == 0 ? 1 : 0;
>   }
> {code}
> I've encountered this problem when using a BitComparator with a configured this.value.length=8,
and in the HBase table there were KeyValues with keyValue.getBuffer().length=207911 bytes.
In this case:
> {code}
>     for (int i = 207910; i >= 0 && b == 0; i--) {
>       switch (bitOperator) {
>         case AND:
>           b = (this.value[207910] ... ==> ArrayIndexOutOfBoundsException
>           break;
> {code}
> That loop should use:
> {code}
>   for (int i = length - 1; i >= 0 && b == 0; i--) { (or this.value.length.)
> {code}
> Should I provide a patch for correcting the problem?

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