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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7686) Re-add rapid rescan of possibly corrupt block feature to the block scanner
Date Fri, 13 Feb 2015 23:14:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14320940#comment-14320940
] 

Hudson commented on HDFS-7686:
------------------------------

FAILURE: Integrated in Hadoop-trunk-Commit #7108 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/7108/])
HDFS-7686. Re-add rapid rescan of possibly corrupt block feature to the block scanner (cmccabe)
(cmccabe: rev 8bb9a5000ed06856abbad268c43ce1d5ad5bdd43)
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBlockScanner.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockSender.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockScanner.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/VolumeScanner.java


> Re-add rapid rescan of possibly corrupt block feature to the block scanner
> --------------------------------------------------------------------------
>
>                 Key: HDFS-7686
>                 URL: https://issues.apache.org/jira/browse/HDFS-7686
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Rushabh S Shah
>            Assignee: Colin Patrick McCabe
>            Priority: Blocker
>             Fix For: 3.0.0
>
>         Attachments: HDFS-7686.002.patch, HDFS-7686.003.patch, HDFS-7686.004.patch
>
>
> When doing a transferTo (aka sendfile operation) from the DataNode to a client, we may
hit an I/O error from the disk.  If we believe this is the case, we should be able to tell
the block scanner to rescan that block soon.  The feature was originally implemented in HDFS-7548
but was removed by HDFS-7430.  We should re-add it.



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