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From "fanshilun (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-22410) CachedStore Prewarm Failure NPE
Date Fri, 01 Nov 2019 01:51:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-22410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16964527#comment-16964527
] 

fanshilun commented on HIVE-22410:
----------------------------------

[~samuelan], Thank you for your help review the code, I will add a note in the code. The specific
reason is also described.

> CachedStore Prewarm Failure NPE
> -------------------------------
>
>                 Key: HIVE-22410
>                 URL: https://issues.apache.org/jira/browse/HIVE-22410
>             Project: Hive
>          Issue Type: Bug
>          Components: Standalone Metastore
>    Affects Versions: 3.1.2, 2.3.7
>         Environment: JDK 1.7.0_40
>            Reporter: fanshilun
>            Assignee: fanshilun
>            Priority: Major
>              Labels: cachedstore
>             Fix For: 2.3.7, 3.1.3
>
>         Attachments: HIVE-22410.1.patch
>
>
> java.lang.NullPointerException
> at org.apache.hadoop.hive.metastore.utils.IncrementalObjectSizeEstimator$ObjectEstimator.estimateArrayElements(IncrementalObjectSizeEstimator.java:501)
~[hive-metastore-2.3.5.jar:2.3.5]
> at org.apache.hadoop.hive.metastore.utils.IncrementalObjectSizeEstimator$ObjectEstimator.estimate(IncrementalObjectSizeEstimator.java:443)
~[hive-metastore-2.3.5.jar:2.3.5]
> at org.apache.hadoop.hive.metastore.utils.IncrementalObjectSizeEstimator$ObjectEstimator.estimate(IncrementalObjectSizeEstimator.java:433)
~[hive-metastore-2.3.5.jar:2.3.5]
> at org.apache.hadoop.hive.metastore.utils.IncrementalObjectSizeEstimator$ObjectEstimator.estimate(IncrementalObjectSizeEstimator.java:369)
~[hive-metastore-2.3.5.jar:2.3.5]
> at org.apache.hadoop.hive.metastore.cached.SharedCache.populateTableInCache(SharedCache.java:1028)
~[hive-metastore-2.3.5.jar:2.3.5]
> at org.apache.hadoop.hive.metastore.cached.CachedStore.prewarm(CachedStore.java:314)
~[hive-metastore-2.3.5.jar:2.3.5]
> at org.apache.hadoop.hive.metastore.cached.CachedStore$CacheUpdateMasterWork.run(CachedStore.java:492)
[hive-metastore-2.3.5.jar:2.3.5]
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_40]
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304) [?:1.7.0_40]
> at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
[?:1.7.0_40]
> at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
[?:1.7.0_40]
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [?:1.7.0_40]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [?:1.7.0_40]
> at java.lang.Thread.run(Thread.java:724) [?:1.7.0_40]
> *reason:*
> Methods estimateArrayElements throw NPE
> I found that the last class does not appear in the parent (HashMap<Class<?>,
Object Estimator> ), and the parent does not contain the information of the ConcurrentHashMap
Class.
> The solution is to initialize the class information before using it.



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