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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (TEZ-924) InputFailedEvent handling for Shuffle
Date Sat, 04 Jul 2015 08:21:04 GMT

     [ https://issues.apache.org/jira/browse/TEZ-924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bikas Saha resolved TEZ-924.
----------------------------
    Resolution: Duplicate

> InputFailedEvent handling for Shuffle
> -------------------------------------
>
>                 Key: TEZ-924
>                 URL: https://issues.apache.org/jira/browse/TEZ-924
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Siddharth Seth
>            Priority: Critical
>
> Shuffle receives batches of Events to process from the AM. The way these events are sent
over to the ShuffleHandlers and the way they're processed - it's possible that Shuffle will
start fetching data from an Event, which is to be subsequently marked as failed (via an InputFailedEvent)
> 1) The AM sends events in batches. An InputFailedEvent for a specific Input may not be
part of the same batch which contained the original event which is being marked bad.
> 2) The ShuffleEventHandler processes the events in each batch one event at a time - so
even if the InputFailedEvent follows - it's possible for Shuffle to start fetching data from
a Failed Input.
> The AM needs to change to invalidate Inputs up front - so that related events don't span
batches. Alternately, it needs to apply the InputFailedEvent to the original event being sent.
> The Shuffle itself should process a batch update as a batch - that would prevent fetchers
from starting early even though there may be additional events for the same host.



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