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https://issues.apache.org/jira/browse/SENTRY-1630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16021918#comment-16021918
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Alexander Kolbasov commented on SENTRY-1630:
--------------------------------------------
We saw the issue on the real cluster. It is possible that HMS could have
received two concurrent requests from two HMSFollower instances so we need to
check how HMS handles such cases. [~kkalyan] encountered similar issue in unit
tests while working on SENTRY-1669 - due to another bug we were requesting full
HM update multiple times in a row and this eventually caused the problem. I
don't think local metastore was involved since [~lina.li] fixes prevent local
metastore from starting. Plus in the case of SENTRY-1669 tests there was only a
single Sentry Server instance.
> out of sequence error in HMSFollower
> ------------------------------------
>
> Key: SENTRY-1630
> URL: https://issues.apache.org/jira/browse/SENTRY-1630
> Project: Sentry
> Issue Type: Sub-task
> Components: Hdfs Plugin
> Affects Versions: sentry-ha-redesign
> Reporter: Hao Hao
> Assignee: Sergio Peña
> Priority: Blocker
> Fix For: sentry-ha-redesign
>
>
> When HMSFollower exits in an abnormal way, for all the following connection
> would encounter out of sequence and SocketTimeoutException: Read timed out.
> Looking at HIVE-6893, it seems to relate to leakage connection problem.
> {noformat}2017-02-15 19:03:42,822 ERROR
> org.apache.sentry.hdfs.FullUpdateInitializer: Task did not complete
> successfully after 0 tries. Exception got:
> org.apache.thrift.TApplicationException: get_database failed: out of sequence
> response
> 2017-02-15 19:03:42,827 ERROR org.apache.sentry.hdfs.FullUpdateInitializer:
> Task did not complete successfully after 0 tries. Exception got:
> MetaException(message:Got exception:
> org.apache.thrift.transport.TTransportException null)
> 2017-02-15 19:03:43,803 INFO hive.metastore: Closed a connection to
> metastore, current connections: 0
> 2017-02-15 19:03:43,803 ERROR org.apache.sentry.service.thrift.HMSFollower:
> Exception occurred persisting Hive full snapshot into DB
> java.lang.RuntimeException: org.apache.thrift.TApplicationException:
> get_database failed: out of sequence response
> at
> org.apache.sentry.hdfs.FullUpdateInitializer.createInitialUpdate(FullUpdateInitializer.java:324)
> at
> org.apache.sentry.service.thrift.HMSFollower.fetchFullUpdate(HMSFollower.java:343)
> at
> org.apache.sentry.service.thrift.HMSFollower.run(HMSFollower.java:244)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.thrift.TApplicationException: get_database failed: out
> of sequence response
> at
> org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:84)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Client.recv_get_database(ThriftHiveMetastore.java:662)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Client.get_database(ThriftHiveMetastore.java:649)
> at
> org.apache.hadoop.hive.metastore.HiveMetaStoreClient.getDatabase(HiveMetaStoreClient.java:1213)
> at
> org.apache.sentry.hdfs.FullUpdateInitializer$DbTask.doTask(FullUpdateInitializer.java:256)
> at
> org.apache.sentry.hdfs.FullUpdateInitializer$BaseTask$RetryStrategy.exec(FullUpdateInitializer.java:110)
> at
> org.apache.sentry.hdfs.FullUpdateInitializer$BaseTask.call(FullUpdateInitializer.java:150)
> at
> org.apache.sentry.hdfs.FullUpdateInitializer$BaseTask.call(FullUpdateInitializer.java:79)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> ... 3 more
> 2017-02-15 19:03:43,849 INFO org.apache.sentry.service.thrift.HMSFollower:
> Making a kerberos connection to HMS{noformat}
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