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From "Xiaowei Zhu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9890) libhdfs++: Add test suite to simulate network issues
Date Mon, 02 May 2016 21:38:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267551#comment-15267551
] 

Xiaowei Zhu commented on HDFS-9890:
-----------------------------------

Uploaded a patch with changes mainly replacing the code blocks that randomly throw errors
with event callback logic.

> libhdfs++: Add test suite to simulate network issues
> ----------------------------------------------------
>
>                 Key: HDFS-9890
>                 URL: https://issues.apache.org/jira/browse/HDFS-9890
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
>            Assignee: Xiaowei Zhu
>         Attachments: HDFS-9890.HDFS-8707.000.patch, HDFS-9890.HDFS-8707.001.patch, HDFS-9890.HDFS-8707.002.patch,
HDFS-9890.HDFS-8707.003.patch
>
>
> I propose adding a test suite to simulate various network issues/failures in order to
get good test coverage on some of the retry paths that aren't easy to hit in mock unit tests.
> At the moment the only things that hit the retry paths are the gmock unit tests.  The
gmock are only as good as their mock implementations which do a great job of simulating protocol
correctness but not more complex interactions.  They also can't really simulate the types
of lock contention and subtle memory stomps that show up while doing hundreds or thousands
of concurrent reads.   We should add a new minidfscluster test that focuses on heavy read/seek
load and then randomly convert error codes returned by network functions into errors.
> List of things to simulate(while heavily loaded), roughly in order of how badly I think
they need to be tested at the moment:
> -Rpc connection disconnect
> -Rpc connection slowed down enough to cause a timeout and trigger retry
> -DN connection disconnect



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