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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6900) RegionScanner.reseek() creates NPE when a flush or compaction happens before the reseek.
Date Sun, 30 Sep 2012 19:50:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466551#comment-13466551

Lars Hofhansl commented on HBASE-6900:

Hmm... Shouldn't the RegionScannerImpl.reseek perform these extra checks? (again, I do not
have a machine with Eclipse to browse the code easily ATM)
> RegionScanner.reseek() creates NPE when a flush or compaction happens before the reseek.
> ----------------------------------------------------------------------------------------
>                 Key: HBASE-6900
>                 URL: https://issues.apache.org/jira/browse/HBASE-6900
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>         Attachments: HBASE-6900_1.patch, HBASE-6900.patch
> HBASE-5520 introduced reseek() on the RegionScanner.  
> Now when a scanner is created we have the StoreScanner heap.  After this if a flush or
compaction happens parallely all the StoreScannerObservers are cleared so that whenever a
new next() call happens we tend to recreate the scanner based on the latest store files.
> The reseek() in StoreScanner expects the heap not to be null because always reseek would
be called from next()
> {code}
> public synchronized boolean reseek(KeyValue kv) throws IOException {
>     //Heap cannot be null, because this is only called from next() which
>     //guarantees that heap will never be null before this call.
>     if (explicitColumnQuery && lazySeekEnabledGlobally) {
>       return heap.requestSeek(kv, true, useRowColBloom);
>     } else {
>       return heap.reseek(kv);
>     }
>   }
> {code}
> Now when we call RegionScanner.reseek() directly using CPs we tend to get a NPE.  In
our case it happened when a major compaction was going on.  I will also attach a testcase
to show the problem.

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