Chetan Mehrotra created OAK-2302:
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Summary: Simplify query debugging with MDC
Key: OAK-2302
URL: https://issues.apache.org/jira/browse/OAK-2302
Project: Jackrabbit Oak
Issue Type: Improvement
Components: query
Reporter: Chetan Mehrotra
Priority: Minor
Fix For: 1.0.9, 1.2
QueryEngine in Oak has support for {{explain}} and {{measure}} to enable a user
to determine how a query is executed by the engine. Result returned via explain
call just tell what index would be used to execute the query. However often we
need to see which all indexes were consulted and what cost were obtained from
them.
To get that data one has to enable debug level log for
{{org.apache.jackrabbit.oak.query}}. Enabling them on a bigger system often
results in lots of logs due to invocation of queries done by various part.
Mostly the log is flooded with reference query invoked by authentication layer
thus making it hard to find out relevant logs.
To simplify getting only debug level logs for query which had explain enabled
it would be helpful to provide support via MDC [1] (which is part of Slf4j API
already being used in Oak)
(patch and usage details to follow)
[1] http://logback.qos.ch/manual/mdc.html
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