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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