[jira] [Commented] (SPARK-39225) History Server initial scan may block new eventlog update

["Hai Tao (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-39225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17538953#comment-17538953 ] 

Hai Tao commented on SPARK-39225:
---------------------------------

Created PR https://github.com/apache/spark/pull/36597.

> History Server initial scan may block new eventlog update
> ---------------------------------------------------------
>
>                 Key: SPARK-39225
>                 URL: https://issues.apache.org/jira/browse/SPARK-39225
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 3.0.3, 3.1.2, 3.2.1
>            Reporter: Hai Tao
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 3.0.3, 3.1.2, 3.2.1
>
>   Original Estimate: 72h
>  Remaining Estimate: 72h
>
> Current Spark History Server suffers when there are a large number of eventlog files under eventLog.dir: when a SHS starts, the initial scan may take a long time, and new eventlog files would not be scanned/parsed until the initial scan completes.
> For example, if the initial scan takes 1-2 days(this is not uncommon in large environments), the newly finished spark jobs would not show up in SHS since their eventlog files are not scanned/parsed until the initial scan process finishes. This would result in a 1-2 days SHS malfunctioning since the newly finished spark jobs are most likely to be queried by users.



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