SingleSharding process keep pace with MultipleSharding process

[skaic]

Fixes #1910.

Changes proposed in this pull request:

• remove SingleSharding process run in currentThread
• catch ExecutionException and throw the JobSystemException of executorService.submit
• assertExecuteFailureWhenThrowExceptionForMultipleShardingItems test is JobSystemException

[codecov-commenter]

Codecov Report

Merging #1911 (7c543e4) into master (adcf88c) will decrease coverage by 0.08%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master    #1911      +/-   ##
============================================
- Coverage     85.66%   85.57%   -0.09%     
+ Complexity      114      113       -1     
============================================
  Files           276      276              
  Lines          6026     6031       +5     
  Branches        922      922              
============================================
- Hits           5162     5161       -1     
- Misses          525      529       +4     
- Partials        339      341       +2     

Impacted Files	Coverage Δ
...sphere/elasticjob/executor/ElasticJobExecutor.java	89.69% <83.33%> (-1.62%)	⬇️
...e/shardingsphere/elasticjob/infra/env/IpUtils.java	60.00% <0.00%> (-4.62%)	⬇️
...sticjob/reg/zookeeper/ZookeeperRegistryCenter.java	72.44% <0.00%> (-0.79%)	⬇️

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[TeslaCN]

The Future and CountDownLatch are doing the same thing, aren't they?
My understanding is submitting a task to the thread pool may cause a thread context switch, which is unnecessary for a single shard.
I think it is better to keep it as it unless we have good reasons.

[skaic]

Thanks for the reply. @TeslaCN

I'm trying work of #1464 .
So I need all process run are same currentThread or executorService.submit at first.

[TeslaCN]

Thanks for the reply. @TeslaCN

I'm trying work of #1464 .
So I need all process run are same currentThread or executorService.submit at first.

I think it is better to discuss about how before doing that.

[skaic]

Yes, you are right.