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https://issues.apache.org/jira/browse/HBASE-15785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15280343#comment-15280343
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Hudson commented on HBASE-15785:
--------------------------------
FAILURE: Integrated in HBase-Trunk_matrix #913 (See
[https://builds.apache.org/job/HBase-Trunk_matrix/913/])
HBASE-15785 Unnecessary lock in ByteBufferArray. (anoopsamjohn: rev
c9ebcd4e296a31e0da43f513db3f5a8c3929c191)
* hbase-common/src/main/java/org/apache/hadoop/hbase/util/ByteBufferUtils.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/util/ByteBufferArray.java
> Unnecessary lock in ByteBufferArray
> -----------------------------------
>
> Key: HBASE-15785
> URL: https://issues.apache.org/jira/browse/HBASE-15785
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver, Scanners
> Affects Versions: 2.0.0
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Fix For: 2.0.0
>
> Attachments: HBASE-15785.patch, HBASE-15785_V2.patch,
> HBASE-15785_V3.patch
>
>
> {code}
> Lock lock = locks[i];
> lock.lock();
> try {
> ByteBuffer bb = buffers[i];
> if (i == startBuffer) {
> cnt = bufferSize - startBufferOffset;
> if (cnt > len) cnt = len;
> ByteBuffer dup = bb.duplicate();
> dup.limit(startBufferOffset + cnt).position(startBufferOffset);
> mbb[j] = dup.slice();
> {code}
> In asSubByteBuff, we work on the duplicate BB and set limit and position on
> that.. The locking is not needed here.
> The locking is added because we set limit and position on the BBs in the
> array. We can duplicate the BBs and do positioning and limit on them. The
> locking can be fully avoided.
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