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Posted to hdfs-issues@hadoop.apache.org by "Junping Du (JIRA)" <ji...@apache.org> on 2016/01/04 00:22:40 UTC
[jira] [Updated] (HDFS-9220) Reading small file (< 512 bytes) that
is open for append fails due to incorrect checksum
[ https://issues.apache.org/jira/browse/HDFS-9220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Junping Du updated HDFS-9220:
-----------------------------
Target Version/s: 2.7.2, 2.6.4 (was: 2.7.2)
> 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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