[jira] Commented: (HBASE-1107) NPE in HStoreScanner.updateReaders

["stack (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-1107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671929#action_12671929 ] 

stack commented on HBASE-1107:
------------------------------

Do you think then Andrew the case is that we are moving from no scanners against files to our first one as the comment suggests?  ("Presume that we went from no readers to at least one -- need to pu...."). 

If so, do you think this.keys and this.scanners need resizing to accomodate the new file scanner?

If so, should we make a new method that does this and have the constructor call it setting them up initially and also this bit of code where we update the readers, have it call it too?  The new method should be synchronized since these are data members?

Please allow that the above speculation may be off. My line numbers do not align with those reported above so I may not have the story right.

> NPE in HStoreScanner.updateReaders
> ----------------------------------
>
>                 Key: HBASE-1107
>                 URL: https://issues.apache.org/jira/browse/HBASE-1107
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.19.1, 0.20.0
>            Reporter: Andrew Purtell
>            Priority: Blocker
>         Attachments: 1107-1.patch
>
>
> 2009-01-01 23:55:41,629 FATAL org.apache.hadoop.hbase.regionserver.MemcacheFlusher: Replay of hlog required. Forcing server shutdown
> org.apache.hadoop.hbase.DroppedSnapshotException: region: content,cff13605e2ea6ce0b221ac864687bf08,1230777531253
>         at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:880)
>         at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:773)
>         at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.flushRegion(MemcacheFlusher.java:227)
>         at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.run(MemcacheFlusher.java:137)
> Caused by: java.lang.NullPointerException
>         at org.apache.hadoop.hbase.regionserver.HStoreScanner.updateReaders(HStoreScanner.java:322)
>         at org.apache.hadoop.hbase.regionserver.HStore.notifyChangedReadersObservers(HStore.java:737)
>         at org.apache.hadoop.hbase.regionserver.HStore.updateReaders(HStore.java:725)
>         at org.apache.hadoop.hbase.regionserver.HStore.internalFlushCache(HStore.java:694)
>         at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:630)
>         at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:865)
>         ... 3 more

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