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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9220) Reading small file (< 512 bytes) that is open for append fails due to incorrect checksum
Date Thu, 15 Oct 2015 18:29:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14959361#comment-14959361
] 

Hudson commented on HDFS-9220:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #1274 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/1274/])
HDFS-9220. Reading small file (< 512 bytes) that is open for append (kihwal: rev c7c36cbd6218f46c33d7fb2f60cd52cb29e6d720)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend2.java


> Reading small file (< 512 bytes) that is open for append fails due to incorrect checksum
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-9220
>                 URL: https://issues.apache.org/jira/browse/HDFS-9220
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.1
>            Reporter: Bogdan Raducanu
>            Assignee: Jing Zhao
>            Priority: Blocker
>             Fix For: 3.0.0, 2.7.2
>
>         Attachments: HDFS-9220.000.patch, HDFS-9220.001.patch, HDFS-9220.002.patch, test2.java
>
>
> Exception:
> 2015-10-09 14:59:40 WARN  DFSClient:1150 - fetchBlockByteRange(). Got a checksum exception
for /tmp/file0.05355529331575182 at BP-353681639-10.10.10.10-1437493596883:blk_1075692769_9244882:0
from DatanodeInfoWithStorage[10.10.10.10]:5001
> All 3 replicas cause this exception and the read fails entirely with:
> BlockMissingException: Could not obtain block: BP-353681639-10.10.10.10-1437493596883:blk_1075692769_9244882
file=/tmp/file0.05355529331575182
> Code to reproduce is attached.
> Does not happen in 2.7.0.
> Data is read correctly if checksum verification is disabled.
> More generally, the failure happens when reading from the last block of a file and the
last block has <= 512 bytes.



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