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https://issues.apache.org/jira/browse/SENTRY-1630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16021906#comment-16021906
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Sergio Peña commented on SENTRY-1630:
-------------------------------------
Interesting.
I saw the error is happening only when the getFullHMSSnapshot was requesting 2
databases at the same time. The logs were showing that the HMS received those 2
requests, then it fails with the out of sequence error. Before receiving 2
requests, there were requests to one database only and that was successful all
the times except when doing it with 2 databases. Maven ran this test 4 times,
and the failure was caused when calling 2 {{get_database}} at the same time.
Then I saw that HIVE-6893 fixed this issue on local metastores (something we
run in our tests). This uses a new synchronized metastore client when
connecting to local metastores. I tested this same code on CDH (where the Hive
patch is backported) and it worked.
> 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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