[SPARK-13988][Core] Make replaying event logs multi threaded in Histo…ry server to ensure a single large log does not block other logs from being rendered.#11800

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Parth-Brahmbhatt:SPARK-13988

Commits on Apr 20, 2016

[SPARK-13988][Core] Make replaying event logs multi threaded in History server to ensure a single large log does not block other logs from being rendered.
Parth-Brahmbhatt
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Added a config to control number of processing threads for history server replay log processing.
Parth-Brahmbhatt
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Commits on Apr 21, 2016

Renaming the config to spark.history.fs.numReplayThreads.
Parth-Brahmbhatt
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