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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Deleted] (HDFS-10140) CLONE - Erasure Coding: reuse BlockReader when reading the same block in pread
Date Tue, 15 Mar 2016 09:43:35 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinayakumar B deleted HDFS-10140:
---------------------------------


> CLONE - Erasure Coding: reuse BlockReader when reading the same block in pread
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-10140
>                 URL: https://issues.apache.org/jira/browse/HDFS-10140
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: dragon
>            Assignee: Jing Zhao
>
> Currently in pread, we create a new block reader for each aligned stripe even though
these stripes belong to the same block. It's better to reuse them to avoid unnecessary block
reader creation overhead. This can also avoid reading from the same bad DataNode.



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