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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1148) Convert FSDataset to ReadWriteLock
Date Wed, 12 May 2010 20:24:43 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866716#action_12866716
] 

Todd Lipcon commented on HDFS-1148:
-----------------------------------

pretty small in 0.20, but FSDataset is substantially reworked in trunk, haven't taken a look
there. In general I just took a conservative approach, and made anything that might possibly
change something use the write lock - even without being fancy it completely dropped this
class off my jstacks.

> Convert FSDataset to ReadWriteLock
> ----------------------------------
>
>                 Key: HDFS-1148
>                 URL: https://issues.apache.org/jira/browse/HDFS-1148
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>
> In benchmarking HDFS-941 I noticed that for the random read workload, the FSDataset lock
is highly contended. After converting it to a ReentrantReadWriteLock, I saw a ~25% improvement
on both latency and ops/second.

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