gianm and fjy #88891
* Tidy up lifecycle, query, and ingestion logging. The goal of this patch is to improve the clarity and usefulness of Druid's logging for cluster operators. For more information, see https://twitter.com/cowtowncoder/status/1195469299814555648. Concretely, this patch does the following: - Changes a lot of INFO logs to DEBUG, and DEBUG to TRACE, with the goal of reducing redundancy and improving clarity by avoiding showing rarely-useful log messages. This includes most "starting" and "stopping" messages, and most messages related to individual columns. - Adds new log4j2 templates that show operators how to enabled DEBUG logging for certain important packages. - Eliminate stack traces for query errors, unless log level is DEBUG or more. This is useful because query errors often indicate user error rather than system error, but dumping stack trace often gave operators the impression that there was a system failure. - Adds task id to Appenderator, AppenderatorDriver thread names. In the default log4j2 configuration, this will put them in log lines as well. It's very useful if a user is using the Indexer, where multiple tasks run in the same JVM. - More consistent terminology when it comes to "sequences" (sets of segments that are handed-off together by Kafka ingestion) and "offsets" (cursors in partitions). These terms had been confused in some log messages due to the fact that Kinesis calls offsets "sequence numbers". - Replaces some ugly toString calls with either the JSONification or something more operator-accessible (like a URL or segment identifier, instead of JSON object representing the same). * Adjustments. * Adjust integration test.
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