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https://reviews.apache.org/r/34821/
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Review request for Ambari, Robert Nettleton, Sumit Mohanty, Sid Wagle, and Tom
Beerbower.
Bugs: AMBARI-11542
https://issues.apache.org/jira/browse/AMBARI-11542
Repository: ambari
Description
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When provisioning a cluster via the blueprint api, occasionally a database
deadlock is detected. There is retry logic around this code so it doesn't
affect the creation of the cluster and a user wouldn't notice this unless they
looked at the logs. That being said, this issue involves incorrect transaction
demarcation and synchronization and is potentially serious depending on how it
is manifested.
The fix involves changing the scope of the database transaction as well as
synchronization.
There are currently many issues transaction/synchronization issues in the state
layer that need to be addresses, this only deals with this exact use case.
Also, this patch strictly deals with correctness and I didn't make an effort to
optimize this path. If this results is a performance regression, there are
several approaches that we could take.
Diffs
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ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariManagementControllerImpl.java
792b6fe
Diff: https://reviews.apache.org/r/34821/diff/
Testing
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Provison clusters many times via looking for a reported database deadlock.
Without this patch, I was able to reproduce the deadlock fairly consistently
and with the patch no deadlock occurred across many installs.
Unit Tests:
- tx/synchronization change only so no new unit test
- currently running full unit test suite and will update review with result
summary when completed
Thanks,
John Speidel
