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https://issues.apache.org/jira/browse/TEZ-3718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16031616#comment-16031616
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Zhiyuan Yang commented on TEZ-3718:
-----------------------------------
TestUnorderedPartitionedKVWriter is flaky, and TestMockDAGAppMaster doesn't
fail on local run.
> Better handling of 'bad' nodes
> ------------------------------
>
> Key: TEZ-3718
> URL: https://issues.apache.org/jira/browse/TEZ-3718
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Siddharth Seth
> Assignee: Zhiyuan Yang
> Attachments: TEZ-3718.1.patch
>
>
> At the moment, the default behaviour in case of a node being marked bad is to
> do nothing other than not schedule new tasks on this node.
> The alternate, via config, is to retroactively kill every task which ran on
> the node, which causes far too many unnecessary re-runs.
> Proposing the following changes.
> 1. KILL fragments which are currently in the RUNNING state (instead of
> relying on a timeout which leads to the attempt being marked as FAILED after
> the timeout interval.
> 2. Keep track of these failed nodes, and use this as input to the failure
> heuristics. Normally source tasks require multiple consumers to report
> failure for them to be marked as bad. If a single consumer reports failure
> against a source which ran on a bad node, consider it bad and re-schedule
> immediately. (Otherwise failures can take a while to propagate, and jobs get
> a lot slower).
> [~jlowe] - think you've looked at this in the past. Any thoughts/suggestions.
> What I'm seeing is retroactive failures taking a long time to apply, and
> restart sources which ran on a bad node. Also running tasks being counted as
> FAILURES instead of KILLS.
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