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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (TEZ-2612) Critical path analyzer for DAGs
Date Mon, 27 Jul 2015 18:54:04 GMT

     [ https://issues.apache.org/jira/browse/TEZ-2612?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bikas Saha reassigned TEZ-2612:
-------------------------------

    Assignee: Bikas Saha

> Critical path analyzer for DAGs
> -------------------------------
>
>                 Key: TEZ-2612
>                 URL: https://issues.apache.org/jira/browse/TEZ-2612
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Rajesh Balamohan
>            Assignee: Bikas Saha
>
> This analyzer plugin/tool can be used to understand the important vertices/tasks of interest
in large DAG for perf analysis / finding bottlenecks.  It can be used to find out 1.input
dependency, 2. failure dependency, 3. scheduling dependency (may be at later stage).
> Creating this as a uber ticket. Getting this detail at vertex level might be possible
with the existing logs derived from ATS.  For task level analysis, certain more details are
required.
> 1. Timeline details like when fetch/merge/compute/sort etc are not captured now. These
details can possibly be added in TaskCompletionEvent
> 2. Need additional details like the last event that completed processing in the input
(for tracing at task level)
> 3. Add downstream task attempt that caused the higher level task to get rescheduled/restarted.
This can be used in terms of understanding in cases where the task failed due to read-error.



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