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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16164) Missing close of new compacted segments in few occasions which might leak MSLAB chunks from pool
Date Sat, 02 Jul 2016 11:04:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15360126#comment-15360126

Hudson commented on HBASE-16164:

FAILURE: Integrated in HBase-Trunk_matrix #1154 (See [https://builds.apache.org/job/HBase-Trunk_matrix/1154/])
HBASE-16164 Missing close of new compacted segments in few occasions (anoopsamjohn: rev 97f2294bfd17f7ae762d2e72ab0f25028b78f3fe)
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MemStoreCompactor.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompactionPipeline.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompactingMemStore.java

> Missing close of new compacted segments in few occasions which might leak MSLAB chunks
from pool
> ------------------------------------------------------------------------------------------------
>                 Key: HBASE-16164
>                 URL: https://issues.apache.org/jira/browse/HBASE-16164
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 2.0.0
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>            Priority: Critical
>             Fix For: 2.0.0
>         Attachments: HBASE-16164.patch
> An in memory compaction of N segments in progress. Inn between snapshot() call comes.
We will stop the in progress compaction then. This just sets an AtomicBoolean.  We check this
boolean state in the compaction loop (while loop reading the cells from the segments) and
before swapping the segments. But if this scenario comes, we are just ignoring the new newly
compacted Segment. This is a problem maker when we work with MSLAB pool. The new segment would
have acquired some chunks but when will they get released? As we dont close the segment this
will leak them.
> Also in swap we have
> {code}
> public boolean swap(VersionedSegmentsList versionedList, ImmutableSegment segment) {
>     if(versionedList.getVersion() != version) {
>       return false;
>     }
>     LinkedList<ImmutableSegment> suffix;
>     synchronized (pipeline){
>       if(versionedList.getVersion() != version) {
>         return false;
>       }
> {code}
> I dont see any possibility for this code flow to happen.  Still for correctness, we should
close the segment here too.

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