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From "James Clampffer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11758) libhdfs++: Catch exceptions thrown by runtime hooks
Date Tue, 16 May 2017 19:34:05 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

James Clampffer updated HDFS-11758:
    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

Committed to HDFS-8707.  Thanks for reviewing [~anatoli.shein].

> libhdfs++: Catch exceptions thrown by runtime hooks
> ---------------------------------------------------
>                 Key: HDFS-11758
>                 URL: https://issues.apache.org/jira/browse/HDFS-11758
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>         Attachments: HDFS-11758.HDFS-8707.000.patch, HDFS-11758.HDFS-8707.001.patch
> Right now there's nothing to stop a user supplied event callback from throwing and unwinding
the stack on the asio worker thread.  This can lead to async filesystem operations that never
complete because the stack was unwound before setting up the next async io call.
> Best practice is to be really careful about what is done inside event hooks and callbacks:
don't throw, sleep, or anything else that might block.  I've seen a few issues pop up because
a hook was made for monitoring purposes and later on stuff that was able to throw was added
without realizing where the exception may end up.

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