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https://issues.apache.org/jira/browse/HDFS-3796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13435472#comment-13435472
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Hudson commented on HDFS-3796:
------------------------------
Integrated in Hadoop-Common-trunk-Commit #2581 (See
[https://builds.apache.org/job/Hadoop-Common-trunk-Commit/2581/])
HDFS-3796. Speed up edit log tests by avoiding fsync(). Contributed by Todd
Lipcon. (Revision 1373567)
Result = SUCCESS
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1373567
Files :
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/EditLogFileOutputStream.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestEditLog.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestEditLogFileOutputStream.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileJournalManager.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeRecovery.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecurityTokenEditLog.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestEditLogsDuringFailover.java
> Speed up edit log tests by avoiding fsync()
> -------------------------------------------
>
> Key: HDFS-3796
> URL: https://issues.apache.org/jira/browse/HDFS-3796
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: test
> Affects Versions: 3.0.0, 2.2.0-alpha
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Minor
> Fix For: 3.0.0, 2.2.0-alpha
>
> Attachments: hdfs-3796.txt, hdfs-3796.txt
>
>
> Our edit log tests are very slow because they incur a lot of fsyncs as they
> write out transactions. Since fsync() has no effect except in the case of
> power outages or system crashes, and we don't care about power outages in the
> context of tests, we can safely skip the fsync without any loss in coverage.
> In my tests, this sped up TestEditLog by about 5x. The testFuzzSequences test
> case improved from ~83 seconds with fsync to about 5 seconds without. These
> results are from my SSD laptop - they are probably even more drastic on
> spinning media.
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