[jira] [Created] (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>]

Colin Patrick McCabe created HDFS-6086:
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             Summary: 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


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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