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From "Ashutosh Mestry (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ATLAS-2129) Atlas shutdown during progress of bulk import throws ConcurrentModificationException
Date Tue, 12 Sep 2017 18:55:00 GMT

    [ https://issues.apache.org/jira/browse/ATLAS-2129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16163480#comment-16163480
] 

Ashutosh Mestry commented on ATLAS-2129:
----------------------------------------

[~ssainath] I don't think this should be a blocker. At best it can be marked as _Major_.

> Atlas shutdown during progress of bulk import throws ConcurrentModificationException
> ------------------------------------------------------------------------------------
>
>                 Key: ATLAS-2129
>                 URL: https://issues.apache.org/jira/browse/ATLAS-2129
>             Project: Atlas
>          Issue Type: Bug
>          Components:  atlas-core
>    Affects Versions: 0.9-incubating
>            Reporter: Sharmadha Sainath
>            Assignee: Ashutosh Mestry
>            Priority: Blocker
>         Attachments: ATLAS-2129-bulkImport-nested-txn.patch
>
>
> 1. Exported an hive_db containing 300 hive_table entities from cluster1 into a zip file
.
> 2. Tried to import into cluster2.
> 3. When the import was in progress ( at 34%) , stopped Atlas.
> 4. Following exception was seen in application logs of cluster2 :
> {code}
> 2017-09-11 10:17:09,192 INFO  - [pool-2-thread-9 - 83fe24a2-ff2b-4add-a94e-a54b09090912:]
~ bulkImport(): progress: 34% (of 301) - entity:last-imported:hive_table:[102]:(2d629a8e-5c94-40e8-b83f-8a9c91c6de8d)
(AtlasEntityStoreV1:238)
> 2017-09-11 10:17:09,340 ERROR - [SIGTERM handler:] ~ Could not commit transaction [1]
due to exception (StandardTitanGraph:731)
> java.util.ConcurrentModificationException
> 	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
> 	at java.util.ArrayList$Itr.next(ArrayList.java:851)
> 	at atlas.shaded.titan.guava.common.collect.Iterators$7.computeNext(Iterators.java:701)
> 	at atlas.shaded.titan.guava.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
> 	at atlas.shaded.titan.guava.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
> 	at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.prepareCommit(StandardTitanGraph.java:473)
> 	at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.commit(StandardTitanGraph.java:654)
> 	at com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx.commit(StandardTitanTx.java:1337)
> 	at com.thinkaurelius.titan.graphdb.blueprints.TitanBlueprintsGraph.shutdown(TitanBlueprintsGraph.java:120)
> 	at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.shutdownInternal(StandardTitanGraph.java:171)
> 	at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.access$700(StandardTitanGraph.java:75)
> 	at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph$ShutdownThread.start(StandardTitanGraph.java:756)
> 	at java.lang.ApplicationShutdownHooks.runHooks(ApplicationShutdownHooks.java:102)
> 	at java.lang.ApplicationShutdownHooks$1.run(ApplicationShutdownHooks.java:46)
> 	at java.lang.Shutdown.runHooks(Shutdown.java:123)
> 	at java.lang.Shutdown.sequence(Shutdown.java:167)
> 	at java.lang.Shutdown.exit(Shutdown.java:212)
> 	at java.lang.Terminator$1.handle(Terminator.java:52)
> 	at sun.misc.Signal$1.run(Signal.java:212)
> 	at java.lang.Thread.run(Thread.java:748)
> {code}
> Other operations that are called during Atlas shut down such as Shutdown hook , Stopping
KafkaNotification service , NotificationHookConsumer , HBaseBasedAuditRepository are not called.
> 5.After that , restarted Atlas.  Atlas functioned properly.
> 6.Resumed import with import option , startGuid= <GUID present in logs at 33 %. Atlas
was stopped when Import was going on at 34% >
> 7. Import completed successfully.
> 8.Post import, only entities from 33% to 100% were imported . Initial 32% of the entities
were not imported.
> 9.Fired an import command again without any interruption and without specifying the startGUID.
All 300 hive_table entities and 1 hive_db were imported successfully.



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