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https://issues.apache.org/jira/browse/HBASE-24380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17125928#comment-17125928
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Viraj Jasani commented on HBASE-24380:
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Tried adding some recovered edit write info locally.
*Sample output:*
Journal Log: null at 1591277609895
Opening log file
hdfs://localhost:62748/user/vjasani/test-data/9f834ad2-5a3f-5b85-f10a-cbadd8fb4efa/WALs/testioeonoutputthread,16010,1591277608241/wal.dat.7
at 1591277609913
Creating recovered edits writer
path=hdfs://localhost:62748/user/vjasani/test-data/9f834ad2-5a3f-5b85-f10a-cbadd8fb4efa/data/default/t1/ccc/recovered.edits/0000000000000000142-wal.dat.7.temp
at 1591277620311
Creating recovered edits writer
path=hdfs://localhost:62748/user/vjasani/test-data/9f834ad2-5a3f-5b85-f10a-cbadd8fb4efa/data/default/t1/bbb/recovered.edits/0000000000000000141-wal.dat.7.temp
at 1591277620311
Processed 20 edits across 2 regions cost 10082 ms; edits skipped=0;
WAL=hdfs://localhost:62748/user/vjasani/test-data/9f834ad2-5a3f-5b85-f10a-cbadd8fb4efa/WALs/testioeonoutputthread,16010,1591277608241/wal.dat.7,
size=1.4 K, length=1411, corrupted=false, progress failed=true at 1591277620539
> Improve WAL splitting log lines to enable sessionization
> --------------------------------------------------------
>
> Key: HBASE-24380
> URL: https://issues.apache.org/jira/browse/HBASE-24380
> Project: HBase
> Issue Type: Improvement
> Components: logging, Operability, wal
> Reporter: Andrew Kyle Purtell
> Priority: Minor
>
> Looking to reconstruct a timeline from write of recovered.edits file back to
> start of WAL file split, with a bunch of unrelated activity in the meantime,
> there isn't a consistent token that links split file write messages (which
> include store path including region hash) to beginning of WAL splitting
> activity. Sessonizing by host doesn't work because work can bounce around
> through retries. Thread context names in the logs vary and can be like
> [nds1-225-fra:60020-7] or [fb472085572ba72e96f1] (trailing digits of region
> hash) or [splits-1589016325868] .
> We could have WALSplitter get the current time when starting the split of a
> WAL file and have it log this timestamp in every line as a splitting session
> identifier.
> Related, we should track the time of split task execution end to end and
> export a metric that captures it.
> It might also be worthwhile to wire up more of WAL splitting to TaskMonitor
> status logging. If we do this we can also enable status journal logging, so
> when a WAL split has completed, a line will appear in the log that has the
> list of all status messages recorded during splitting and the time delta in
> milliseconds between them.
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