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From "kartheek muthyala (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1605) Convert DFSInputStream synchronized sections to a ReadWrite lock
Date Tue, 12 May 2015 08:52:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1605?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

kartheek muthyala updated HDFS-1605:
------------------------------------
    Labels: BB2015-05-RFC  (was: BB2015-05-TBR)

> 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
>              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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