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https://issues.apache.org/jira/browse/HIVE-21479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Dai updated HIVE-21479:
------------------------------
    Attachment: HIVE-21479.1.patch

> NPE during metastore cache update
> ---------------------------------
>
>                 Key: HIVE-21479
>                 URL: https://issues.apache.org/jira/browse/HIVE-21479
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>            Priority: Major
>         Attachments: HIVE-21479.1.patch
>
>
> Saw the following stack during a long periodical update:
> {code}
> 2019-03-12T10:01:43,015 ERROR [CachedStore-CacheUpdateService: Thread-36] 
> cache.CachedStore: Update failure:java.lang.NullPointerException
>       at 
> org.apache.hadoop.hive.metastore.cache.CachedStore$CacheUpdateMasterWork.updateTableColStats(CachedStore.java:508)
>       at 
> org.apache.hadoop.hive.metastore.cache.CachedStore$CacheUpdateMasterWork.update(CachedStore.java:461)
>       at 
> org.apache.hadoop.hive.metastore.cache.CachedStore$CacheUpdateMasterWork.run(CachedStore.java:396)
>       at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>       at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>       at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>       at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>       at java.lang.Thread.run(Thread.java:748)
> {code}
> The reason is we get the table list at very early stage and then refresh 
> table one by one. It is likely table is removed during the interim. We need 
> to deal with this case during cache update.



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