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https://issues.apache.org/jira/browse/HBASE-18847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16176367#comment-16176367
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Sean Busbey commented on HBASE-18847:
-------------------------------------
{quote}
-1 test4tests 0m 0s The patch doesn't appear to include any new or
modified tests. Please justify why no new tests are needed for this patch. Also
please list what manual steps were performed to verify this patch.
{quote}
I'd say we don't need a test for this, since we're just changing a lock around
a log message and we don't have any framework for testing changes to logging
currently.
> remove unneeded synchronized block from hfilev2 warning in branch-1.2
> ---------------------------------------------------------------------
>
> Key: HBASE-18847
> URL: https://issues.apache.org/jira/browse/HBASE-18847
> Project: HBase
> Issue Type: Bug
> Components: Performance
> Affects Versions: 1.2.0, 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.2.5, 1.2.6
> Reporter: Rich Howarth
> Assignee: Rich Howarth
> Priority: Critical
> Fix For: 1.2.7
>
> Attachments: HBASE-18847-branch-1.2-00.patch
>
>
> The below code block starts at line 277 of HFileWriterV2.java. Class-level
> synchronization in a heavily used code path has a demonstrably significant
> negative effect on performance. I tested forcing a major compaction with 18
> compaction threads per node; removing the synchronization resulted in an
> order of magnitude performance increase, with the bottleneck then being at
> the disks (where I want it to be).
> {code:java}
> synchronized (HFileWriterV2.class) {
> if (WARN_CELL_WITH_TAGS && getFileContext().isIncludesTags()) {
> LOG.warn("A minimum HFile version of " +
> HFile.MIN_FORMAT_VERSION_WITH_TAGS
> + " is required to support cell attributes/tags. Consider setting "
> + HFile.FORMAT_VERSION_KEY + " accordingly.");
> WARN_CELL_WITH_TAGS = false;
> }
> }
> {code}
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