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https://issues.apache.org/jira/browse/HDFS-8150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499736#comment-14499736
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J.Andreina commented on HDFS-8150:
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[~kihwal] I would like to work on this issue. If you have already started
working on this issue , please feel free to assign to you.
> 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
>
> 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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