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From "binlijin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17118) StoreScanner leaked in KeyValueHeap
Date Thu, 17 Nov 2016 04:08:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15672658#comment-15672658
] 

binlijin commented on HBASE-17118:
----------------------------------

Ok, done.

> StoreScanner leaked in KeyValueHeap
> -----------------------------------
>
>                 Key: HBASE-17118
>                 URL: https://issues.apache.org/jira/browse/HBASE-17118
>             Project: HBase
>          Issue Type: Bug
>            Reporter: binlijin
>            Assignee: binlijin
>         Attachments: HBASE-17118-master_v1.patch, HBASE-17118-master_v2.patch, StoreScanner.png,
StoreScannerLeakHeap.png
>
>
> KeyValueHeap#generalizedSeek
>       KeyValueScanner scanner = current;
>       while (scanner != null) {
>         Cell topKey = scanner.peek();
>         ......
>         boolean seekResult;
>         if (isLazy && heap.size() > 0) {
>           // If there is only one scanner left, we don't do lazy seek.
>           seekResult = scanner.requestSeek(seekKey, forward, useBloom);
>         } else {
>           seekResult = NonLazyKeyValueScanner.doRealSeek(scanner, seekKey,
>               forward);
>         }
>         ......
>         scanner = heap.poll();
>       }
> (1) scanner = heap.poll();  Retrieves and removes the head of this queue
> (2) scanner.requestSeek(seekKey, forward, useBloom); or NonLazyKeyValueScanner.doRealSeek(scanner,
seekKey, forward);
> throw exception, and scanner will have no chance to close, so will cause the scanner
leak.



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