[jira] [Updated] (HDFS-6086) Fix a case where zero-copy or no-checksum reads were not allowed even when the block was cached

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-6086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe updated HDFS-6086:
---------------------------------------

    Attachment: HDFS-6086.001.patch

> Fix a case where zero-copy or no-checksum reads were not allowed even when the block was cached
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-6086
>                 URL: https://issues.apache.org/jira/browse/HDFS-6086
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 2.4.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-6086.001.patch
>
>
> We need to fix a case where zero-copy or no-checksum reads are not allowed even when the block is cached.  The case is when the block is cached before the {{REQUEST_SHORT_CIRCUIT_FDS}} operation begins.  In this case, {{DataXceiver}} needs to consult the {{ShortCircuitRegistry}} to see if the block is cached, rather than relying on a callback.



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