GitHub user shivaram opened a pull request:
https://github.com/apache/spark/pull/16261
[SPARK-18836] [CORE] Serialize one copy of task metrics in DAGScheduler
## What changes were proposed in this pull request?
Right now we serialize the empty task metrics once per task â Since this
is shared across all tasks we could use the same serialized task metrics across
all tasks of a stage.
## How was this patch tested?
- [ ] Run tests on EC2 to measure performance improvement
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/shivaram/spark-1 task-metrics-one-copy
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16261.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #16261
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commit 3a76605520dba8b73ce8d3e01059ea21ea7259ab
Author: Shivaram Venkataraman <[email protected]>
Date: 2016-12-13T00:12:13Z
Serialize one copy of task metrics in DAGScheduler
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