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https://issues.apache.org/jira/browse/SPARK-22330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-22330:
-----------------------------------
Assignee: Alexander
> Linear containsKey operation for serialized maps.
> -------------------------------------------------
>
> Key: SPARK-22330
> URL: https://issues.apache.org/jira/browse/SPARK-22330
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.2.1, 2.2.0
> Reporter: Alexander
> Assignee: Alexander
> Labels: performance
> Fix For: 2.3.0
>
> Original Estimate: 5m
> Remaining Estimate: 5m
>
> One of our production application which aggressively uses cached spark RDDs
> degraded after increasing volumes of data though it shouldn't. Fast profiling
> session showed that the slowest part was SerializableMapWrapper#containsKey:
> it delegates get and remove to actual implementation, but containsKey is
> inherited from AbstractMap which is implemented in linear time via iteration
> over whole keySet. A workaround was simple: replacing all containsKey with
> get(key) != null solved the issue.
> Nevertheless, it would be much simpler for everyone if the issue will be
> fixed once and for all.
> A fix is straightforward, delegate containsKey to actual implementation.
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