hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1605) Convert DFSInputStream synchronized sections to a ReadWrite lock
Date Wed, 06 May 2015 03:26:07 GMT

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

Allen Wittenauer updated HDFS-1605:
-----------------------------------
    Labels: BB2015-05-TBR  (was: )

> 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: dhruba borthakur
>              Labels: BB2015-05-TBR
>         Attachments: DFSClientRWlock.1.txt, DFSClientRWlock.3.txt, 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



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message