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https://issues.apache.org/jira/browse/HBASE-13578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14518123#comment-14518123
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Hudson commented on HBASE-13578:
--------------------------------
FAILURE: Integrated in HBase-1.1 #440 (See
[https://builds.apache.org/job/HBase-1.1/440/])
HBASE-13578 Remove Arrays.asList().subList() from FSHLog.offer()
(matteo.bertozzi: rev 3fba9de03e63fbf4b60734c32a75b00e2f892411)
*
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java
> Remove Arrays.asList().subList() from FSHLog.offer()
> ----------------------------------------------------
>
> Key: HBASE-13578
> URL: https://issues.apache.org/jira/browse/HBASE-13578
> Project: HBase
> Issue Type: Improvement
> Components: wal
> Affects Versions: 1.0.0, 2.0.0, 1.1.0
> Reporter: Matteo Bertozzi
> Assignee: Matteo Bertozzi
> Priority: Trivial
> Fix For: 2.0.0, 1.1.0, 1.2.0
>
> Attachments: ArrayTest.java, HBASE-13578-v0.patch
>
>
> while doing a run with a profiler I noticed this:
> {code}
> FSHLog.java
> void offer(final long sequence, final SyncFuture [] syncFutures, final int
> syncFutureCount) {
> ...
> this.syncFutures.addAll(Arrays.asList(syncFutures).subList(0,
> syncFutureCount));
> }
> {code}
> it is creating an Arrays.ArrayList then a RandomAccessSubList,
> and then addAll() is using creating an iterator and call the
> syncFutures.add() for each item.
> a simpler for loop adding the items directly is not too ugly and it will
> avoid all this stuff.
> I've attached a simple test to compare the two, it will not make huge
> difference but since we are in the core path any tiny bit probably helps.
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