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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10460) Erasure Coding: Recompute block checksum for a particular range less than file size on the fly by reconstructing missed block
Date Tue, 21 Jun 2016 15:21:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15341962#comment-15341962
] 

Rakesh R commented on HDFS-10460:
---------------------------------

oops, you are right. Will take care in next patch.

> Erasure Coding: Recompute block checksum for a particular range less than file size on
the fly by reconstructing missed block
> -----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-10460
>                 URL: https://issues.apache.org/jira/browse/HDFS-10460
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>         Attachments: HDFS-10460-00.patch, HDFS-10460-01.patch
>
>
> This jira is HDFS-9833 follow-on task to address reconstructing block and then recalculating
block checksum for a particular range query.
> For example,
> {code}
> // create a file 'stripedFile1' with fileSize = cellSize * numDataBlocks = 65536 * 6
= 393216
> FileChecksum stripedFileChecksum = getFileChecksum(stripedFile1, 10, true);
> {code}



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