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Posted to hdfs-issues@hadoop.apache.org by "Dmytro Molkov (JIRA)" <ji...@apache.org> on 2011/03/22 19:16:05 UTC

[jira] [Commented] (HDFS-1148) Convert FSDataset to ReadWriteLock

    [ https://issues.apache.org/jira/browse/HDFS-1148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009755#comment-13009755 ] 

Dmytro Molkov commented on HDFS-1148:
-------------------------------------

Todd, in your patch you are using ReentrantReadWriteLock in a Non-Fair mode, is this intentional?

> 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
>         Attachments: hdfs-1148-old.txt
>
>
> 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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