[
https://issues.apache.org/jira/browse/HDFS-1148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009782#comment-13009782
]
Todd Lipcon commented on HDFS-1148:
-----------------------------------
As I understood it, the non-fair mode is more efficient. Since the lock is
mostly uncontended, I figured strict fairness wasn't important. Do you have
some results that indicate the non-fair mode is a problem?
> 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.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
