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https://issues.apache.org/jira/browse/HDFS-9620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15086340#comment-15086340
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Kihwal Lee commented on HDFS-9620:
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The read path already has a mechanism for refetching block tokens, but it is
currently not possible for writers to reacquire a block token for existing
block being written.
> Slow writer may fail permanently if pipeline breaks.
> ----------------------------------------------------
>
> Key: HDFS-9620
> URL: https://issues.apache.org/jira/browse/HDFS-9620
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kihwal Lee
> Priority: Critical
>
> During a block write to a datanode, if the block write time exceed the block
> token expiration, the client will not be able to reestablish a block output
> stream. E.g. if a node in the pipeline dies, the pipeline recovery won't work.
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