Leigh Stewart created BOOKKEEPER-862:
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Summary: Add tracing and stats to OrderedSafeExecutor for
debugging slow tasks
Key: BOOKKEEPER-862
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-862
Project: Bookkeeper
Issue Type: Task
Components: bookkeeper-server
Reporter: Leigh Stewart
Priority: Minor
Porting a change form the Twitter branch to improve stats and logging in
OrderedSafeExecutor
These changes have been helpful for us in debugging latency issues in
Bookkeeper server/client
Summary of changes is
* add a config option for op stats
* add stats for task execution time, task pending time
* add a config option for logging a warning when an op takes longer than x
micros
* add toString implementations for submitted tasks so make it easier to track
down slow ops
* start using Builder for OrderedSafeExecutor
* add a very simple test to make sure that the slow op logging path is exercised
Most of this came from Sijie originally, with some changes from me
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