[jira] [Resolved] (SPARK-22784) Configure reading buffer size in Spark History Server

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-22784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-22784.
-------------------------------
    Resolution: Won't Fix

> Configure reading buffer size in Spark History Server
> -----------------------------------------------------
>
>                 Key: SPARK-22784
>                 URL: https://issues.apache.org/jira/browse/SPARK-22784
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.2.1
>            Reporter: Mikhail Erofeev
>            Priority: Minor
>         Attachments: replay-baseline.svg
>
>
> Motivation:
> Our Spark History Server spends most of the backfill time inside BufferedReader and StringBuffer. It happens because average line size of our events is ~1.500.000 chars (due to a lot of partitions and iterations), whereas the default buffer size is 2048 bytes. See the attached flame graph.
> Implementation:
> I've added logging of spent time and line size for each job.
> Parametrised ReplayListenerBus with a new buffer size parameter. 
> Measured the best buffer size. x20 of the average line size (30mb) gives 32% speedup in a local test.
> Result:
> Backfill of Spark History and reading to the cache will be up to 30% faster after tuning.



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