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https://issues.apache.org/jira/browse/HDFS-445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12729808#action_12729808
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Raghu Angadi commented on HDFS-445:
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+1. This is an important fix for clients that keep a file open for a long time
(like HBase).
> pread() fails when cached block locations are no longer valid
> -------------------------------------------------------------
>
> Key: HDFS-445
> URL: https://issues.apache.org/jira/browse/HDFS-445
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kan Zhang
> Assignee: Kan Zhang
> Attachments: 445-06.patch, 445-08.patch
>
>
> when cached block locations are no longer valid (e.g., datanodes restart on
> different ports), pread() will fail, whereas normal read() still succeeds
> through re-fetching of block locations from namenode (up to a max number of
> times).
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