[
https://issues.apache.org/jira/browse/HDFS-6773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14078460#comment-14078460
]
Daryn Sharp commented on HDFS-6773:
-----------------------------------
The reason is every NN operation currently takes the full hit for a spindle
sync which can cost 10+ms.
> MiniDFSCluster can run dramatically faster
> ------------------------------------------
>
> Key: HDFS-6773
> URL: https://issues.apache.org/jira/browse/HDFS-6773
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.0.0-alpha, 3.0.0
> Reporter: Daryn Sharp
>
> The mini cluster is unnecessarily running with durable edit logs. The
> following change cut runtime of a single test from ~30s to ~10s.
> {code}EditLogFileOutputStream.setShouldSkipFsyncForTesting(true);{code}
> The mini cluster should default to this behavior after identifying the few
> edit log tests that probably depend on durable logs.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
