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https://issues.apache.org/jira/browse/HDFS-2848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198045#comment-13198045
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Ravi Prakash commented on HDFS-2848:
------------------------------------
Can someone please tell me if a datanode is supposed to verify the checksums of
the chunks in a block it is serving up before sending it onto the network? If
so why is DataXceiver.java:215 setting verifyChecksum to false?
{noformat}
blockSender = new BlockSender(block, blockOffset, length,
true, false, datanode, clientTraceFmt);
{noformat}
> hdfs corruption appended to blocks is not detected by fs commands or fsck
> -------------------------------------------------------------------------
>
> Key: HDFS-2848
> URL: https://issues.apache.org/jira/browse/HDFS-2848
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.23.0
> Reporter: Ravi Prakash
> Assignee: Ravi Prakash
>
> Courtesy Pat White [~patwhitey2007]
> {quote}
> Appears that there is a regression in corrupt block detection by both fsck
> and fs cmds like 'cat'. Testcases for
> pre-block and block-overwrite corruption of all replicas is correctly
> reporting errors however post-block corruption is
> not, fsck on the filesystem reports it's Healthy and 'cat' returns without
> error. Looking at the DN blocks themselves,
> they clearly contain the injected corruption pattern.
> {quote}
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