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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9098) Erasure coding: emulate race conditions among striped streamers in write pipeline
Date Thu, 17 Sep 2015 18:40:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhe Zhang updated HDFS-9098:
----------------------------
    Description: 
Apparently the interleaving of events among {{StripedDataStreamer}}'s is very tricky to handle.
[~walter.k.su] and [~jingzhao] have discussed several race conditions under HDFS-9040.

Let's use FaultInjector to emulate different combinations of interleaved events.

In particular, we should consider inject delays in the following places:
# {{Streamer#endBlock}}
# {{Streamer#locateFollowingBlock}}
# {{Streamer#updateBlockForPipeline}}
# {{Streamer#updatePipeline}}
# {{OutputStream#writeChunk}}
# {{OutputStream#close}}

  was:
Apparently the interleaving of events among {{StripedDataStreamer}}s is very tricky to handle.
[~walter.k.su] and [~jingzhao] have discussed several race conditions under HDFS-9040.

Let's use FaultInjector to emulate different combinations of interleaved events.


> Erasure coding: emulate race conditions among striped streamers in write pipeline
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-9098
>                 URL: https://issues.apache.org/jira/browse/HDFS-9098
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>
> Apparently the interleaving of events among {{StripedDataStreamer}}'s is very tricky
to handle. [~walter.k.su] and [~jingzhao] have discussed several race conditions under HDFS-9040.
> Let's use FaultInjector to emulate different combinations of interleaved events.
> In particular, we should consider inject delays in the following places:
> # {{Streamer#endBlock}}
> # {{Streamer#locateFollowingBlock}}
> # {{Streamer#updateBlockForPipeline}}
> # {{Streamer#updatePipeline}}
> # {{OutputStream#writeChunk}}
> # {{OutputStream#close}}



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