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https://issues.apache.org/jira/browse/HBASE-19732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16324213#comment-16324213
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ramkrishna.s.vasudevan commented on HBASE-19732:
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bq.There is no way to run the memstore in isolation w/ mslab checking all gets
cleaned up?
We already have test for this. But we need to have a region way of test only
and that too a secondary region and then check the MSLAB openScanner count or
the MSLAB pool size - something like that.
> Replica regions does not return back the MSLAB chunks to pool
> -------------------------------------------------------------
>
> Key: HBASE-19732
> URL: https://issues.apache.org/jira/browse/HBASE-19732
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.0.0-alpha-4
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Priority: Critical
> Fix For: 2.0.0-beta-2
>
> Attachments: HBASE-19732.patch, HBASE-19732_1.patch,
> HBASE-19732_2.patch
>
>
> When we have region replica enabled, we try to replicate the flush markers.
> In the replica region on receiving the FLUSH_START_MARKER we create a
> snapshot. On receiving COMMIT_FLUSH_MARKER we just update the store files and
> clear the snapshot. But in the recent trunk code while creating snapshot
> (need to verify in other branches too)
> {code}
> this.timeRangeTracker = snapshot.getTimeRangeTracker();
> this.scanners = snapshot.getScanners(Long.MAX_VALUE, Long.MAX_VALUE);
> this.tagsPresent = snapshot.isTagsPresent();
> {code}
> The scanners that we create internally increment the openScannerCount per
> MSLAB. But since in this case we don't call scanner.close() we don't
> decrement the scanner count and so the MSLAB chunks are not returned back to
> the pool when the snapshot is closed in the replica region.
> {code}
> int count = openScannerCount.get();
> LOG.info("the count is "+count);
> if(count == 0) {
> recycleChunks();
> {code}
> This is a critical bug.
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