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https://issues.apache.org/jira/browse/SPARK-17930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15577852#comment-15577852
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Sean Owen commented on SPARK-17930:
-----------------------------------
Maybe so; I think the question is whether this would cause it to be used by
multiple threads at once. Do you have any rough benchmarks that suggest this is
a bottleneck?
> The SerializerInstance instance used when deserializing a TaskResult is not
> reused
> -----------------------------------------------------------------------------------
>
> Key: SPARK-17930
> URL: https://issues.apache.org/jira/browse/SPARK-17930
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.6.1, 2.0.1
> Reporter: Guoqiang Li
>
> The following code is called when the DirectTaskResult instance is
> deserialized
> {noformat}
> def value(): T = {
> if (valueObjectDeserialized) {
> valueObject
> } else {
> // Each deserialization creates a new instance of SerializerInstance,
> which is very time-consuming
> val resultSer = SparkEnv.get.serializer.newInstance()
> valueObject = resultSer.deserialize(valueBytes)
> valueObjectDeserialized = true
> valueObject
> }
> }
> {noformat}
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