[HBASE-27762] Include EventType and ProcedureV2 pid in logging via MDC - ASF JIRA

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Type: Task
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: 2.6.0, 3.0.0-alpha-4, 2.5.3, 2.4.17
Fix Version/s: 2.6.0, 3.0.0-alpha-4, 2.5.5, 2.4.18
Component/s: None
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Release Note:

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Log the `o.a.h.hbase.executor.EventType` and ProcedureV2 pid in log messages via MDC. PatternLayouts on master and branch-2 have been updated to make use of the MDC variables. Note that due to ~~LOG4J2-3660~~, log lines for which the MDC is empty will have extraneous characters. To opt-in on branch-2.5 or branch-2.4, make an appropriate change to `conf/log4j2.properties`.

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 Log the `o.a.h.hbase.executor.EventType` and ProcedureV2 pid in log messages via MDC. PatternLayouts on master and branch-2 have been updated to make use of the MDC variables. Note that due to LOG4J2-3660 , log lines for which the MDC is empty will have extraneous characters. To opt-in on branch-2.5 or branch-2.4, make an appropriate change to `conf/log4j2.properties`.

Description

Tracing the distributed actions of ProcedureV2 RemoteProcedure execution is painful. We are pretty good about logging the proc_id most of the time, but we don't catch them all. Now that we're up on log4j2, let's use the MDC feature to include some basic information universally.