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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 Mon, 18 May 2015 07:32:02 GMT

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

kartheek muthyala updated HDFS-1605:
------------------------------------
    Attachment: HADOOP-1605-trunk-2.patch

Whitespaces and checkstyle issues fixed.

> 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-2.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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