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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8760) Erasure Coding: reuse BlockReader when reading the same block in pread
Date Thu, 16 Jul 2015 01:13:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8760?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao updated HDFS-8760:
----------------------------
    Attachment:     (was: HDFS-8760.000.patch)

> Erasure Coding: reuse BlockReader when reading the same block in pread
> ----------------------------------------------------------------------
>
>                 Key: HDFS-8760
>                 URL: https://issues.apache.org/jira/browse/HDFS-8760
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-8760.000.patch
>
>
> 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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