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Posted to issues@spark.apache.org by "Jungtaek Lim (Jira)" <ji...@apache.org> on 2021/02/06 04:03:00 UTC

[jira] [Created] (SPARK-34383) Optimize WAL commit phase on SS

Jungtaek Lim created SPARK-34383:
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             Summary: Optimize WAL commit phase on SS
                 Key: SPARK-34383
                 URL: https://issues.apache.org/jira/browse/SPARK-34383
             Project: Spark
          Issue Type: Improvement
          Components: Structured Streaming
    Affects Versions: 3.2.0
            Reporter: Jungtaek Lim


I found there're unnecessary access / expensive operation of file system in WAL commit phase of SS.

They can be optimized via caching (using driver memory a bit) & replacing FS operation. This brings reduced latency per batch, especially checkpoint against object store.



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