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**The table is out of date, to be updated**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 <wi...@qq.com>
Date: 2017-03-02T14:50:54Z
Move task serialization from the TaskSetManager to the
CoarseGrainedSchedulerBackend
----
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
