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From "James Clampffer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10952) libhdfs++: Fix test_libhdfs_threaded_hdfspp_test_shim_static non-deterministic failures
Date Fri, 26 Oct 2018 13:14:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

James Clampffer updated HDFS-10952:
-----------------------------------
    Parent Issue: HDFS-14032  (was: HDFS-8707)

> libhdfs++: Fix test_libhdfs_threaded_hdfspp_test_shim_static non-deterministic failures
> ---------------------------------------------------------------------------------------
>
>                 Key: HDFS-10952
>                 URL: https://issues.apache.org/jira/browse/HDFS-10952
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>            Priority: Major
>
> test_libhdfs_threaded_hdfspp_test_shim_static has started failing more often and not
a whole lot has changed that should directly impact this.
> It looks like the failure mode is error injection in the read pipeline.  Until HDFS-10951
is completed reads don't have a retry mechanism so any error injection will cause that read
to fail.  However that doesn't explain why these failures have been happening more frequently
lately.  The failures seem to be hardware or timing specific; they almost never happen in
some environments and happen fairly frequently in others.  It might help to set up a test
harness to step through revisions and see if a specific commit causes the probability of a
failure to go up.



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