Tao Zhang created HDFS-12906:
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Summary: hedged point read in DFSInputStream sends only 1 hedge
read request
Key: HDFS-12906
URL: https://issues.apache.org/jira/browse/HDFS-12906
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs-client
Reporter: Tao Zhang
Assignee: Tao Zhang
Hedged point read is handled in DFSInputStream.hedgedFetchBlockByteRange(). It
calls "getFirstToComplete()" to get the 1st returned result after sending out
hedge read requests. But since "getFirstToComplete()" uses
"CompletionService.take()" which is a endlessly blocking operation. It will
wait for 1 result after sending only 1 hedge read request.
It could be changed to wait for a specific timeout (instead of infinite
timeout) and starting another hedge read request.
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