[improve] [broker] Print warn log if compaction failure

[poorbarcode]

Motivation

Now exceptions that happen in the flow of compaction task are collected into variable currentCompaction and don't print any log.

When compaction doesn't work, two reasons come to mind:

• the task skipped by rules.
• the task failed.

We can't determine which causing the problem if there has no log, this increases the difficulty of troubleshooting.

The API pulsar-admin topics compaction-status <topic> lets us see what happens when the last compaction executes, But it can not help us know if there were previous missions that failed.

Modifications

Print warn log if compaction fails.

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository:

• [ci] [improve] [broker] Print warn log if compaction failure poorbarcode/pulsar#63

[poorbarcode]

/pulsarbot rerun-failure-checks

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.59%. Comparing base (39dd1cd) to head (6cb2ff6).
⚠️ Report is 2891 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #19405       +/-   ##
=============================================
+ Coverage     32.36%   62.59%   +30.22%     
- Complexity     6355    25663    +19308     
=============================================
  Files          1648     1830      +182     
  Lines        123990   133944     +9954     
  Branches      13523    14737     +1214     
=============================================
+ Hits          40129    83838    +43709     
+ Misses        77958    42381    -35577     
- Partials       5903     7725     +1822     

Flag	Coverage Δ
inttests	24.88% <0.00%> (+0.07%)	⬆️
systests	25.58% <0.00%> (-0.11%)	⬇️
unittests	59.78% <100.00%> (+42.24%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...sar/broker/service/persistent/PersistentTopic.java	64.30% <100.00%> (+13.02%)	⬆️

... and 1230 files with indirect coverage changes

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