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https://issues.apache.org/jira/browse/HDFS-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13557819#comment-13557819
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Todd Lipcon commented on HDFS-4421:
-----------------------------------
The block scanner thread sets this flag to true AFAIK. It could certainly be
refactored to not do it this way.
> Remove verify checksum option from BlockSender
> ----------------------------------------------
>
> Key: HDFS-4421
> URL: https://issues.apache.org/jira/browse/HDFS-4421
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.0.0
> Reporter: Brandon Li
> Assignee: Brandon Li
>
> When users read data from HDFS and require checksum verification, the
> checksum is validated by DFSClient before sending data to the user
> application.
> Currently BlockSender has the option (corruptChecksumOk/verifyChecksum) to
> verify checksum. This option is not turned on anywhere in current code.
> Validating checksum on the server(DataNode) side is redundant since DFSClient
> still needs to do the same work again due to possible errors introduced by
> the data transportation from the server to the client.
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