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https://issues.apache.org/jira/browse/HDFS-12906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16438904#comment-16438904
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Wei-Chiu Chuang commented on HDFS-12906:
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Hi [~thinktaocs] could you please add affect version? We fixed quite a few
hedged read bugs late last year (HDFS-11738, HDFS-11303, HDFS-11708) so I'm not
sure if this issue is still valid.
> 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
> Priority: Major
>
> 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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