Blake Eggleston created CASSANDRA-13797:
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Summary: RepairJob blocks on syncTasks
Key: CASSANDRA-13797
URL: https://issues.apache.org/jira/browse/CASSANDRA-13797
Project: Cassandra
Issue Type: Bug
Reporter: Blake Eggleston
Assignee: Blake Eggleston
Fix For: 4.0
The thread running {{RepairJob}} blocks while it waits for the validations it
starts to complete ([see
here|https://github.com/bdeggleston/cassandra/blob/9fdec0a82851f5c35cd21d02e8c4da8fc685edb2/src/java/org/apache/cassandra/repair/RepairJob.java#L185]).
However, the downstream callbacks (ie: the post-repair cleanup stuff) aren't
waiting for {{RepairJob#run}} to return, they're waiting for a result to be set
on RepairJob the future, which happens after the sync tasks have completed.
This post repair cleanup stuff also immediately shuts down the executor
{{RepairJob#run}} is running in. So in noop repair sessions, where there's
nothing to stream, I'm seeing the callbacks sometimes fire before
{{RepairJob#run}} wakes up, and causing an {{InterruptedException}} is thrown.
I'm pretty sure this can just be removed, but I'd like a second opinion. This
appears to just be a holdover from before repair coordination became async. I
thought it might be doing some throttling by blocking, but each repair session
gets it's own executor, and validation is throttled by the fixed size
executors doing the actual work of validation, so I don't think we need to keep
this around.
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