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https://issues.apache.org/jira/browse/HDFS-1605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14543306#comment-14543306
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Vinayakumar B commented on HDFS-1605:
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[~kartheek], Thanks for the patch.
It would be lot better if patch excludes whitespace changes and format changes
and limit to only current Jira related changes. Because lot of them are
whitespace changes and format changes.
I assume you might have done code format on entire file.
> Convert DFSInputStream synchronized sections to a ReadWrite lock
> ----------------------------------------------------------------
>
> Key: HDFS-1605
> URL: https://issues.apache.org/jira/browse/HDFS-1605
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Reporter: dhruba borthakur
> Assignee: kartheek muthyala
> Labels: BB2015-05-RFC
> Attachments: DFSClientRWlock.1.txt, DFSClientRWlock.3.txt,
> HADOOP-1605-trunk-1.patch, HADOOP-1605-trunk.patch, HDFS-1605.txt
>
>
> Hbase does concurrent preads from multiple threads to different blocks of the
> same hdfs file. Each of these pread calls invoke
> DFSInputStream.getFileLength() and DFSInputStream.getBlockAt(). These methods
> are "synchronized", thus causing all the concurrent threads to serialize. It
> would help performance to convert this to a Read/Write lock
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