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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8150) Make getFileChecksum fail for blocks under construction
Date Thu, 14 May 2015 15:15:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14543794#comment-14543794
] 

Hudson commented on HDFS-8150:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #195 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/195/])
HDFS-8150. Make getFileChecksum fail for blocks under construction (Contributed by J.Andreina)
(vinayakumarb: rev def9136e0259e118e6fd7b656260765d28ac9ae6)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestGetFileChecksum.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestSnapshotFileLength.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java


> Make getFileChecksum fail for blocks under construction
> -------------------------------------------------------
>
>                 Key: HDFS-8150
>                 URL: https://issues.apache.org/jira/browse/HDFS-8150
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: J.Andreina
>            Priority: Critical
>             Fix For: 2.8.0
>
>         Attachments: HDFS-8150.1.patch, HDFS-8150.2.patch, HDFS-8150.3.patch
>
>
> We have seen the cases of validating data copy using checksum then the content of target
changing. It turns out the target wasn't closed successfully, so it was still under-construction.
 One hour later, a lease recovery kicked in and truncated the block.
> Although this can be prevented in many ways, if there is no valid use case for getting
file checksum from under-construction blocks, can it be disabled?  E.g. Datanode can throw
an exception if the replica is not in the finalized state.



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