Details
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Bug
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Status: Resolved
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Major
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Resolution: Not A Problem
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2.1.1
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None
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None
Description
Using Yarn with dynamic allocation enabled, spark does not allocate more containers when current containers(executors) number is less than the max executor num.
For example, we only have 7 executors working, while our cluster is not busy, and I have set
{{ spark.dynamicAllocation.maxExecutors = 600}}
and the current jobs of the context are executed slowly.
A live case with online logs:
```
$ grep "Not adding executors because our current target total" spark-job-server.log.9 | tail
[2018-04-12 16:07:19,070] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 16:07:20,071] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 16:07:21,072] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 16:07:22,073] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 16:07:23,074] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 16:07:24,075] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 16:07:25,076] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 16:07:26,077] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 16:07:27,078] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 16:07:28,079] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
$ grep "Not adding executors because our current target total" spark-job-server.log.9 | head
[2018-04-12 13:52:18,067] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 13:52:19,071] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 13:52:20,072] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 13:52:21,073] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 13:52:22,074] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 13:52:23,075] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 13:52:24,076] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 13:52:25,077] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 13:52:26,078] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
[2018-04-12 13:52:27,079] DEBUG .ExecutorAllocationManager [] [akka://JobServer/user/jobManager] - Not adding executors because our current target total is already 600 (limit 600)
$ grep "Not adding executors because our current target total" spark-job-server.log.9 | wc -l
8111
```
The logs mean that we are keeping the `numExecutorsTarget == maxNumExecutors == 600` without requesting new executors. And at that time, we only have 7 executors available for our users.
