GitHub user zsxwing opened a pull request:
https://github.com/apache/spark/pull/16220
[SPARK-18796][SS]StreamingQueryManager should not block when starting a
query
## What changes were proposed in this pull request?
Major change in this PR:
- Add `pendingQueryNames` and `pendingQueryIds` to track that are going to
start but not yet put into `activeQueries` so that we don't need to hold a lock
when starting a query.
Minor changes:
- Fix a potential NPE when the user sets `checkpointLocation` using SQLConf
but doesn't specify a query name.
- Add missing docs in `StreamingQueryListener`
## How was this patch tested?
Jenkins
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zsxwing/spark SPARK-18796
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16220.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 #16220
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