From: @feng_xue_feng
Reviewed-by: @ouwenchang,@yelihua
Signed-off-by: @yelihua

From: @moran3
Reviewed-by: @yelihua,@ouwenchang
Signed-off-by: @ouwenchang

From: @fan-jibin
Reviewed-by: 
Signed-off-by:

From: @weiyanxi
Reviewed-by: @yelihua,@ouwenchang
Signed-off-by: @ouwenchang

From: @jiang-shuqiang
Reviewed-by: @yelihua,@ouwenchang
Signed-off-by: @ouwenchang

From: @liangtianshu
Reviewed-by: @ouwenchang,@yelihua
Signed-off-by: @yelihua

From: @jiang-shuqiang
Reviewed-by: 
Signed-off-by:

From: @yang_91b9
Reviewed-by: @wenkai_dist
Signed-off-by:

From: @liuchongming74
Reviewed-by: @ouwenchang,@yelihua
Signed-off-by: @yelihua

From: @feng_xue_feng
Reviewed-by: @ouwenchang,@yelihua
Signed-off-by: @yelihua

From: @gzhcv
Reviewed-by: @ouwenchang,@lilongfei15
Signed-off-by: @lilongfei15

From: @fuyu0830
Reviewed-by: 
Signed-off-by:

From: @moran3
Reviewed-by: 
Signed-off-by:

From: @wenkai_dist
Reviewed-by: 
Signed-off-by:

1. Ease the elegant exiting procedure by providing a singleton access pattern. Now the exiting procedure can easily call the exit_non_block method to notify the executors to start exiting worker processes. If the worker processes not exit after a timeout, the mindinsight stop still can kill these processes.

2. Build a framework for managing computing resources used by different businesses. Different businesses can now call the get_executor() API to get their process pool to execute compute heavy tasks outside the mindinsight guinicorn worker process, which will make the restful api respond more quickly.

From: @moran3
Reviewed-by: 
Signed-off-by:

From: @gzhcv
Reviewed-by: @ouwenchang,@yelihua
Signed-off-by: @yelihua

From: @zyhstack
Reviewed-by: 
Signed-off-by:

From: @huang_wei_feng4
Reviewed-by: @ouwenchang,@yelihua
Signed-off-by: @yelihua