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https://issues.apache.org/jira/browse/HBASE-17118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15674669#comment-15674669
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Mikhail Antonov commented on HBASE-17118:
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[~tedyu] let me have a look and come back in a bit
> StoreScanner leaked in KeyValueHeap
> -----------------------------------
>
> Key: HBASE-17118
> URL: https://issues.apache.org/jira/browse/HBASE-17118
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: binlijin
> Assignee: binlijin
> Fix For: 2.0.0, 1.4.0
>
> Attachments: HBASE-17118-master_v1.patch,
> HBASE-17118-master_v2.patch, HBASE-17118-master_v3.patch,
> HBASE-17118-master_v4.patch, HBASE-17118-master_v5.patch,
> HBASE-17118.branch-1.v1.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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