Samir Ahmic created HBASE-15121:
-----------------------------------
Summary: 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
Fix For: 2.0.0
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 with continue
allowing client to retry to locate region. This sounds like simplest solution
here.
Thoughts ?
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