GitHub user uncleGen opened a pull request:
https://github.com/apache/spark/pull/16601
[SPARK-19182][DStream] Optimize the lock in StreamingJobProgressListener to
not block UI when generating Streaming jobs
## What changes were proposed in this pull request?
When DStreamGraph is generating a job, it will hold a lock and block other
APIs. Because StreamingJobProgressListener (numInactiveReceivers,
streamName(streamId: Int), streamIds) needs to call DStreamGraph's methods to
access some information, the UI may hang if generating a job is very slow
(e.g., talking to the slow Kafka cluster to fetch metadata).
It's better to optimize the locks in DStreamGraph and
StreamingJobProgressListener to make the UI not block by job generation.
## How was this patch tested?
existing ut
cc @zsxwing
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/uncleGen/spark SPARK-19182
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16601.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 #16601
----
commit 46036bf683632e03f970de20f7bcd17b5369d5dc
Author: uncleGen <[email protected]>
Date: 2017-01-16T09:14:32Z
Optimize the lock in StreamingJobProgressListener to not block UI when
generating Streaming jobs
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