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https://issues.apache.org/jira/browse/HBASE-15121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16397716#comment-16397716
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stack commented on HBASE-15121:
-------------------------------
[~asamir] Say more about how you replicated. Was the ITMTTR run on a
single-node or on a cluster? What was the command-line? Thanks.
> ConnectionImplementation#locateRegionInMeta() issue when master is restarted
> ----------------------------------------------------------------------------
>
> Key: HBASE-15121
> URL: https://issues.apache.org/jira/browse/HBASE-15121
> Project: HBase
> Issue Type: Bug
> Components: Client
> Affects Versions: 2.0.0
> Reporter: Samir Ahmic
> Assignee: Samir Ahmic
> Priority: Major
> Fix For: 2.0.0
>
> Attachments: HBASE-15121-v0.patch, HBASE-15121-v0.patch
>
>
> I notice this issue while i was running
> IntegrationTestMTTR#testRestartMaster() test was failing on put operation.
> Here is sequence of events from logs leading to failed put operation:
> Master restart
> {code}
> INFO [pool-5-thread-1] util.Shell: Executing full command [/usr/bin/ssh
> hnode2 "sudo -u hbase ps aux | grep proc_master | grep -v grep | tr -s ' ' |
> cut -d ' ' -f2 | xargs kill -s SIGKILL"]
> {code}
> Client trying to locate region for row=70efdf2ec9b086079795c442636b55fb-17
> (this is additional logging inspecting metaKey which is used to search
> hbase:meta )
> {code}
> 2016-01-15 10:26:05,169 INFO [HBaseWriterThread_9]
> client.ConnectionImplementation: metaKey inspection:
> table=IntegrationTestMTTRLoadTestTool row=
> 70efdf2ec9b086079795c442636b55fb-17 metaKey=
> IntegrationTestMTTRLoadTestTool,70efdf2ec9b086079795c442636b55fb-17,99999999999999
> {code}
> Client throwing TableNotFoundException (hbase:meta scan returned null)
> {code}
> 2016-01-15 10:32:58,154 INFO [HBaseWriterThread_5]
> client.ConnectionImplementation: regionInfo result is null:
> HBaseWriterThread_5 throwing TableNotFoundException logging details
> table=IntegrationTestMTTRLoadTestTool row=70efdf2ec9b086079795c442636b55fb-17
> metaKey=IntegrationTestMTTRLoadTestTool,70efdf2ec9b086079795c442636b55fb-17,99999999999999
> 2016-01-15 10:32:58,154 ERROR [HBaseWriterThread_5] client.AsyncProcess:
> Failed to get region location
> org.apache.hadoop.hbase.TableNotFoundException:
> IntegrationTestMTTRLoadTestTool
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.locateRegionInMeta(ConnectionImplementation.java:890)
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.locateRegion(ConnectionImplementation.java:781)
> at
> org.apache.hadoop.hbase.client.AsyncProcess.submit(AsyncProcess.java:396)
> at
> org.apache.hadoop.hbase.client.AsyncProcess.submit(AsyncProcess.java:344)
> at
> org.apache.hadoop.hbase.client.BufferedMutatorImpl.backgroundFlushCommits(BufferedMutatorImpl.java:239)
> at
> org.apache.hadoop.hbase.client.BufferedMutatorImpl.flush(BufferedMutatorImpl.java:191)
> at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:949)
> at org.apache.hadoop.hbase.client.HTable.put(HTable.java:569)
> at
> org.apache.hadoop.hbase.util.MultiThreadedWriter$HBaseWriterThread.insert(MultiThreadedWriter.java:146)
> at
> org.apache.hadoop.hbase.util.MultiThreadedWriter$HBaseWriterThread.run(MultiThreadedWriter.java:111)
> {code}
> And as result we have failed insert operation:
> {code}
> 2016-01-15 10:32:58,179 ERROR [HBaseWriterThread_5] util.MultiThreadedWriter:
> Failed to insert: 17 after 60046ms; region information: cached:
> region=IntegrationTestMTTRLoadTestTool,66666660,1452849956427.05b437185a9437f178726a55a29a79b7.,
> hostname=hnode4,16020,1452776418437, seqNum=5; cache is up to date; errors:
> exception from null for 70efdf2ec9b086079795c442636b55fb-17
> org.apache.hadoop.hbase.TableNotFoundException:
> IntegrationTestMTTRLoadTestTool
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.locateRegionInMeta(ConnectionImplementation.java:890)
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.locateRegion(ConnectionImplementation.java:781)
> at
> org.apache.hadoop.hbase.client.AsyncProcess.submit(AsyncProcess.java:396)
> at
> org.apache.hadoop.hbase.client.AsyncProcess.submit(AsyncProcess.java:344)
> at
> org.apache.hadoop.hbase.client.BufferedMutatorImpl.backgroundFlushCommits(BufferedMutatorImpl.java:239)
> at
> org.apache.hadoop.hbase.client.BufferedMutatorImpl.flush(BufferedMutatorImpl.java:191)
> at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:949)
> at org.apache.hadoop.hbase.client.HTable.put(HTable.java:569)
> at
> org.apache.hadoop.hbase.util.MultiThreadedWriter$HBaseWriterThread.insert(MultiThreadedWriter.java:146)
> at
> org.apache.hadoop.hbase.util.MultiThreadedWriter$HBaseWriterThread.run(MultiThreadedWriter.java:111)
> {code}
> leading to test failing:
> {code}
> Failed to write key: 17
> 2016-01-15 10:33:53,984 INFO [main] mttr.IntegrationTestMTTR: RestartMaster
> failed after 469878ms.
> java.util.concurrent.ExecutionException: java.lang.AssertionError: Load
> failed expected:<0> but was:<1>
> {code}
> Here is snippet from ConnectionImplementation#locateRegionInMeta() throwing
> exception:
> {code}
> try {
> Result regionInfoRow = null;
> ReversedClientScanner rcs = null;
> try {
> rcs = new ClientSmallReversedScanner(conf, s,
> TableName.META_TABLE_NAME, this,
> rpcCallerFactory, rpcControllerFactory, getMetaLookupPool(), 0);
> regionInfoRow = rcs.next();
> } finally {
> if (rcs != null) {
> rcs.close();
> }
> }
> if (regionInfoRow == null) {
> throw new TableNotFoundException(tableName);
> {code}
> I was able to avoid this issue by removing thrown declaration and adding
> continue allowing client to retry to locate region. This sounds like simplest
> solution here.
> Thoughts ?
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