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From "Mehrdad Nurolahzade (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AURORA-1837) Improve task history pruning
Date Sat, 11 Feb 2017 05:31:41 GMT

    [ https://issues.apache.org/jira/browse/AURORA-1837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862230#comment-15862230
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Mehrdad Nurolahzade commented on AURORA-1837:
---------------------------------------------

The current implementation is also inefficient in the sense that it tries to delete an expired
task multiple times. The asynchronous nature of {{BatchWorker}} which used to process task
deletions introduces some delay between delete enqueue and delete execution. As a result,
tasks already deemed deleted in a previous evaluation round might get picked up, evaluated
and enqueued for deletion multiple times (note that if a task is not found {{deleteTasks.deleteTasks()}}
does not fail).

This is evident in {{tasks_pruned}} metric which reflects numbers much higher than the actual
number of expired tasks deleted.

> Improve task history pruning
> ----------------------------
>
>                 Key: AURORA-1837
>                 URL: https://issues.apache.org/jira/browse/AURORA-1837
>             Project: Aurora
>          Issue Type: Task
>            Reporter: Reza Motamedi
>            Assignee: Mehrdad Nurolahzade
>            Priority: Minor
>              Labels: scheduler
>
> Current implementation of {{TaskHistoryPrunner}} registers all inactive tasks upon terminal
_state_ change for pruning. {{TaskHistoryPrunner::registerInactiveTask()}} uses a delay executor
to schedule the process of pruning _task_s. However, we have noticed most of pruning takes
place after scheduler recovers from a fail-over.
> Modify {{TaskHistoryPruner}} to a design similar to {{JobUpdateHistoryPruner}}:
> # Instead of registering delay executor's upon terminal task state transitions, have
it wake up on preconfigured intervals, find all terminal state tasks that meet pruning criteria
and delete them.
> # Make the initial task history pruning delay configurable so that it does not hamper
scheduler upon start.



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