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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3964) Index.preWALRestore should handle index write failure
Date Tue, 20 Jun 2017 16:45:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16056057#comment-16056057
] 

Hadoop QA commented on PHOENIX-3964:
------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12873695/PHOENIX-3964_v1.patch
  against master branch at commit fba5fa28a03279e3fc427de800774690d280edca.
  ATTACHMENT ID: 12873695

    {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
tests.
                        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 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:red}-1 javadoc{color}.  The javadoc tool appears to have generated 50 warning messages.

    {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 core tests{color}.  The patch failed these unit tests:
     

Test results: https://builds.apache.org/job/PreCommit-PHOENIX-Build/1115//testReport/
Javadoc warnings: https://builds.apache.org/job/PreCommit-PHOENIX-Build/1115//artifact/patchprocess/patchJavadocWarnings.txt
Console output: https://builds.apache.org/job/PreCommit-PHOENIX-Build/1115//console

This message is automatically generated.

> Index.preWALRestore should handle index write failure
> -----------------------------------------------------
>
>                 Key: PHOENIX-3964
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3964
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.10.0
>            Reporter: chenglei
>         Attachments: PHOENIX-3964_v1.patch
>
>
> When I restarted my hbase cluster a certain time, I noticed some regions are in FAILED_OPEN
state and the RegionServers have some error logs as following:
> {code:java}
> 2017-06-20 12:31:30,493 ERROR [RS_OPEN_REGION-rsync:60020-3] handler.OpenRegionHandler:
Failed open of region=BIZARCH_NS_PRODUCT.BIZTRACER_SPAN,0100134e-7ddf-4d13-ab77-6f0d683e5fad_0,1487594358223.57a7be72f9beaeb4285529ac6236f4e5.,
starting to roll back the global memstore size.
> org.apache.phoenix.hbase.index.exception.MultiIndexWriteFailureException: Failed to write
to multiple index tables
>         at org.apache.phoenix.hbase.index.write.recovery.TrackingParallelWriterIndexCommitter.write(TrackingParallelWriterIndexCommitter.java:221)
>         at org.apache.phoenix.hbase.index.write.IndexWriter.write(IndexWriter.java:185)
>         at org.apache.phoenix.hbase.index.write.RecoveryIndexWriter.write(RecoveryIndexWriter.java:75)
>         at org.apache.phoenix.hbase.index.Indexer.preWALRestore(Indexer.java:554)
>         at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$58.call(RegionCoprocessorHost.java:1312)
>         at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$RegionOperation.call(RegionCoprocessorHost.java:1517)
>         at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.execOperation(RegionCoprocessorHost.java:1592)
>         at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.execOperation(RegionCoprocessorHost.java:1549)
>         at org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.preWALRestore(RegionCoprocessorHost.java:1308)
>         at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEdits(HRegion.java:3338)
>         at org.apache.hadoop.hbase.regionserver.HRegion.replayRecoveredEditsIfAny(HRegion.java:3220)
>         at org.apache.hadoop.hbase.regionserver.HRegion.initializeRegionStores(HRegion.java:823)
>         at org.apache.hadoop.hbase.regionserver.HRegion.initializeRegionInternals(HRegion.java:716)
>         at org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:687)
>         at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4596)
>         at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4566)
>         at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4538)
>         at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4494)
>         at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:4445)
>         at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:465)
>         at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:139)
>         at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:128)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>         at java.lang.Thread.run(Thread.java:745)
> {code}
> When I look the code of Index.preWALRestore method, I find RecoveryIndexWriter.write
method is used to write the indexUpdates in following line 543: 
>    
> {code:java}
>  
> 526  public void preWALRestore(ObserverContext<RegionCoprocessorEnvironment> env,
HRegionInfo info,
> 527      HLogKey logKey, WALEdit logEdit) throws IOException {
> 528      if (this.disabled) {
> 529          super.preWALRestore(env, info, logKey, logEdit);
> 530          return;
> 531        }
> 532    // TODO check the regions in transition. If the server on which the region lives
is this one,
> 533    // then we should rety that write later in postOpen.
> 534    // we might be able to get even smarter here and pre-split the edits that are
server-local
> 535    // into their own recovered.edits file. This then lets us do a straightforward
recovery of each
> 536    // region (and more efficiently as we aren't writing quite as hectically from
this one place).
> 537
> 538    /*
> 539     * Basically, we let the index regions recover for a little while long before
retrying in the
> 540     * hopes they come up before the primary table finishes.
> 541     */
> 542    Collection<Pair<Mutation, byte[]>> indexUpdates = extractIndexUpdate(logEdit);
> 543    recoveryWriter.write(indexUpdates, true);
> 544  }
> {code}
> but the RecoveryIndexWriter.write method is as following, it directly throws Exception
except non-existing tables, so RecoveryIndexWriter's failurePolicy(which is StoreFailuresInCachePolicy
by default) even has no opportunity to be used,  and it leads to Index.failedIndexEdits which
is filled by the StoreFailuresInCachePolicy is always empty.
> {code:java}
>  public void write(Collection<Pair<Mutation, byte[]>> toWrite, boolean allowLocalUpdates)
throws IOException {
>         try {
>             write(resolveTableReferences(toWrite), allowLocalUpdates);
>         } catch (MultiIndexWriteFailureException e) {
>             for (HTableInterfaceReference table : e.getFailedTables()) {
>                 if (!admin.tableExists(table.getTableName())) {
>                     LOG.warn("Failure due to non existing table: " + table.getTableName());
>                     nonExistingTablesList.add(table);
>                 } else {
>                     throw e;
>                 }
>             }
>         }
>     }
> {code}
> So the Index.postOpen method seems useless, because the updates Multimap in following
522 line which is got from Index.failedIndexEdits is always empty.
> {code:java}
> 499  public void postOpen(final ObserverContext<RegionCoprocessorEnvironment> c)
{
> 500     Multimap<HTableInterfaceReference, Mutation> updates = failedIndexEdits.getEdits(c.getEnvironment().getRegion());
> 501     
> 502     if (this.disabled) {
> 503         super.postOpen(c);
> 504         return;
> 505      }
> 506   
> 507     //if we have no pending edits to complete, then we are done
> 508     if (updates == null || updates.size() == 0) {
> 509       return;
> 510      }
> 511
> 512     LOG.info("Found some outstanding index updates that didn't succeed during"
> 513            + " WAL replay - attempting to replay now.");
> 514    
> 515     // do the usual writer stuff, killing the server again, if we can't manage to
make the index
> 516     // writes succeed again
> 517     try {
> 518        writer.writeAndKillYourselfOnFailure(updates, true);
> 519     } catch (IOException e) {
> 520              LOG.error("During WAL replay of outstanding index updates, "
> 521                    + "Exception is thrown instead of killing server during index
writing", e);
> 522    }
> 523  }
> {code}
> So  I think in Index.preWALRestore method,  we should use RecoveryWriter.writeAndKillYourselfOnFailure
method to write the indexUpdates and handle index write failure, not just use the RecoveryIndexWriter.write
method.
>  



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