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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8874) PutCombiner is skipping KeyValues while combining puts of same row during bulkload
Date Mon, 15 Jul 2013 14:30:54 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13708501#comment-13708501

Hadoop QA commented on HBASE-8874:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

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

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 hadoop1.0{color}.  The patch compiles against the hadoop 1.0 profile.

    {color:green}+1 hadoop2.0{color}.  The patch compiles against the hadoop 2.0 profile.

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

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

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

  {color:green}+1 site{color}.  The mvn 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/6340//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6340//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6340//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6340//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6340//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6340//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6340//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6340//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6340//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/6340//console

This message is automatically generated.
> PutCombiner is skipping KeyValues while combining puts of same row during bulkload
> ----------------------------------------------------------------------------------
>                 Key: HBASE-8874
>                 URL: https://issues.apache.org/jira/browse/HBASE-8874
>             Project: HBase
>          Issue Type: Bug
>          Components: mapreduce
>    Affects Versions: 0.95.0, 0.95.1
>            Reporter: rajeshbabu
>            Assignee: rajeshbabu
>            Priority: Critical
>             Fix For: 0.98.0, 0.95.2
>         Attachments: HBASE-8874_trunk.patch
> While combining puts of same row in map phase we are using below logic in PutCombiner#reduce.
In for loop first time we will add one Put object to puts map. Next time onwards we are just
overriding key values of a family with key values of the same family in other put. So we are
mostly writing one Put object to map output and remaining will be skipped(data loss).
> {code}
>     Map<byte[], Put> puts = new TreeMap<byte[], Put>(Bytes.BYTES_COMPARATOR);
>     for (Put p : vals) {
>       cnt++;
>       if (!puts.containsKey(p.getRow())) {
>         puts.put(p.getRow(), p);
>       } else {
>         puts.get(p.getRow()).getFamilyMap().putAll(p.getFamilyMap());
>       }
>     }
> {code}
> We need to change logic similar as below because we are sure the rowkey of all the puts
will be same.
> {code}
>     Put finalPut = null;
>     Map<byte[], List<? extends Cell>> familyMap = null;
>     for (Put p : vals) {
>      cnt++;
>       if (finalPut==null) {
>         finalPut = p;
>         familyMap = finalPut.getFamilyMap();
>       } else {
>         for (Entry<byte[], List<? extends Cell>> entry : p.getFamilyMap().entrySet())
>           List<? extends Cell> list = familyMap.get(entry.getKey());
>           if (list == null) {
>             familyMap.put(entry.getKey(), entry.getValue());
>           } else {
>             (((List<KeyValue>)list)).addAll((List<KeyValue>)entry.getValue());
>           }
>         }
>       }
>     }
>     context.write(row, finalPut);
> {code}
> Also need to implement TODOs mentioned by Nick 
> {code}
>     // TODO: would be better if we knew <code>K row</code> and Put rowkey
>     // identical. Then this whole Put buffering business goes away.
>     // TODO: Could use HeapSize to create an upper bound on the memory size of
>     // the puts map and flush some portion of the content while looping. This
>     // flush could result in multiple Puts for a single rowkey. That is
>     // acceptable because Combiner is run as an optimization and it's not
>     // critical that all Puts are grouped perfectly.
> {code}

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