GitHub user witgo opened a pull request:
https://github.com/apache/spark/pull/17139
[WIP][SPARK-18890][CORE](try 3) Move task serialization from the
TaskSetManager to the CoarseGrainedSchedulerBackend
## What changes were proposed in this pull request?
See https://issues.apache.org/jira/browse/SPARK-18890
In the case of stage has a lot of tasks, this PR can improve the scheduling
performance of ~~15%~~
The test code:
``` scala
val rdd = sc.parallelize(0 until 100).repartition(100000)
rdd.localCheckpoint().count()
rdd.sum()
(1 to 10).foreach{ i=>
val serializeStart = System.currentTimeMillis()
rdd.sum()
val serializeFinish = System.currentTimeMillis()
println(f"Test $i: ${(serializeFinish - serializeStart) / 1000D}%1.2f")
}
```
and `spark-defaults.conf` file:
```
spark.master yarn-client
spark.executor.instances 20
spark.driver.memory 64g
spark.executor.memory 30g
spark.executor.cores 5
spark.default.parallelism 100
spark.sql.shuffle.partitions 100
spark.serializer
org.apache.spark.serializer.KryoSerializer
spark.driver.maxResultSize 0
spark.ui.enabled false
spark.driver.extraJavaOptions -XX:+UseG1GC
-XX:+UseStringDeduplication -XX:G1HeapRegionSize=16M -XX:MetaspaceSize=512M
spark.executor.extraJavaOptions -XX:+UseG1GC
-XX:+UseStringDeduplication -XX:G1HeapRegionSize=16M -XX:MetaspaceSize=256M
spark.cleaner.referenceTracking.blocking true
spark.cleaner.referenceTracking.blocking.shuffle true
```
The test results are as follows
**The table is out of date, to be updated**
| [SPARK-17931](https://github.com/witgo/spark/tree/SPARK-17931) |
[941b3f9](https://github.com/apache/spark/commit/941b3f9aca59e62c078508a934f8c2221ced96ce)
|
| --- | --- |
| 17.116 s | 21.764 s |
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/witgo/spark SPARK-18890-multi-threading
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17139.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 #17139
----
commit bfa285b1bd677e0c0b8a57ceda4433bb8ae072e9
Author: Guoqiang Li <[email protected]>
Date: 2017-03-02T14:50:54Z
Move task serialization from the TaskSetManager to the
CoarseGrainedSchedulerBackend
----
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