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https://issues.apache.org/jira/browse/HDFS-89?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934648#action_12934648
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Thanh Do commented on HDFS-89:
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This is true for data file, if the length of a data block get truncated
by ext3 fsck, NN will detect this because the NN knows the length
of the block.
But we saw a case that once a meta file get truncated,
and DN boots up, send a block report to NN, NN doesn't detect
that problem.
This kind of corruption can only be detect by a reader,
or a data block scanner.
> Datanode should verify block sizes vs metadata on startup
> ---------------------------------------------------------
>
> Key: HDFS-89
> URL: https://issues.apache.org/jira/browse/HDFS-89
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Brian Bockelman
>
> I could have sworn this bug had been reported by someone else already, but I
> can't find it on JIRA after searching.... apologies if this is a duplicate.
> The datanode, upon starting up, should check and make sure that all block
> sizes as reported via `stat` are the same as the block sizes as reported via
> the block's metadata.
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