GitHub user watermen opened a pull request:
https://github.com/apache/incubator-carbondata/pull/863 [CARBONDATA-998] Don't request executors when we use carbon distribution
In the current implementation, carbon request executors if it need more executors. This brings the following questions:
1. Carbon interferes with spark dispatch to make request/remove executors confusedly.
2. Carbon will involk DistributionUtil.getDistinctNodesList and sleep some times to make sure the executors are assigned, it wastes a lot of time.
We'd better make the data scan and schedule independently.
### In CarbonData layout
Make one task scan multiple splits to make the input size of task larger and the number of tasks fewer.
### In Spark layout(dynamic allocation is enable)
Request executors if some resources are released by other apps and we won't reach the max number of executors.
Now, I only invoke DistributionUtil.getNodeList insteads of DistributionUtil.ensureExecutorsAndGetNodeList. We can talked about this idea here and then I can remove the useless code about DistributionUtil.ensureExecutorsAndGetNodeList.
cc @jackylk @QiangCai @kumarvishal09
You can merge this pull request into a Git repository by running:
$ git pull
https://github.com/watermen/incubator-carbondata CARBONDATA-998
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-carbondata/pull/863.patchTo close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #863
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commit 824d0f7790f5559d48be6b1878786bc384af51a9
Author: Yadong Qi <
[hidden email]>
Date: 2017-04-27T07:54:49Z
Don't request executors when we use carbon distribution
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