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https://issues.apache.org/jira/browse/HDFS-9643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Clampffer updated HDFS-9643:
----------------------------------
    Attachment: HDFS-9643.HDFS-8707.001.patch

New patch:
-Added tests into the remote_block_reader_test because most of the 
infrastructure was already there.
-Pushed all of the cancellation checking logic into Pipeline.  The pipeline can 
optionally take a CancelHandle.  It will also propagate out Cancel statuses 
returned from continuations.
-CancelTracker uses a std::atomic_bool instead of a mutex+bool
-FileHandle checks CancelHandle and bails out of any new operations if the 
handle has been canceled.

> libhdfs++: Support async cancellation of read operations
> --------------------------------------------------------
>
>                 Key: HDFS-9643
>                 URL: https://issues.apache.org/jira/browse/HDFS-9643
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>         Attachments: HDFS-9643.HDFS-8707.000.patch, 
> HDFS-9643.HDFS-8707.001.patch
>
>
> It should be possible for any thread to cancel operations in progress on a 
> FileHandle.  Any ephemeral objects created by the FileHandle should free 
> resources as quickly as possible.



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