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https://issues.apache.org/jira/browse/SPARK-31608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim reassigned SPARK-31608:
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Assignee: Baohe Zhang
> Add a hybrid KVStore to make UI loading faster
> ----------------------------------------------
>
> Key: SPARK-31608
> URL: https://issues.apache.org/jira/browse/SPARK-31608
> Project: Spark
> Issue Type: Story
> Components: Web UI
> Affects Versions: 3.0.1
> Reporter: Baohe Zhang
> Assignee: Baohe Zhang
> Priority: Major
>
> This is a follow-up for the work done by Hieu Huynh in 2019.
> Add a new class HybridKVStore to make the history server faster when loading
> event files. When rebuilding the application state from event logs,
> HybridKVStore will first write data to an in-memory store and having a
> background thread that keeps pushing the change to levelDB.
> I ran some tests on 3.0.1 on mac os:
> ||kvstore type / log size||100m||200m||500m||1g||2g||
> |HybridKVStore|5s to parse, 7s(include the parsing time) to switch to
> leveldb|6s to parse, 10s to switch to leveldb|15s to parse, 23s to switch to
> leveldb|23s to parse, 40s to switch to leveldb|37s to parse, 73s to switch to
> leveldb|
> |LevelDB|12s to parse|19s to parse|43s to parse|69s to parse|124s to parse|
> For example when loading a 1g file, HybridKVStore takes 23s to parse (that
> means, users only need to wait for 23s to see the UI), the background thread
> will still run 17s to copy data to leveldb. And after that, the in memory
> store can be closed, the entire store now moves to leveldb. So in general, it
> has 3x - 4x UI loading speed improvement.
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