Region Historian
----------------
Key: HBASE-533
URL: https://issues.apache.org/jira/browse/HBASE-533
Project: Hadoop HBase
Issue Type: Wish
Reporter: Bryan Duxbury
Priority: Minor
Whenever we try to debug region splitting, assignment, compaction, etc. issues,
we always end up having to look in 1-20 different log files for cryptic names
of regions and try to piece together the chain of events ourselves. This is a
challenging at best effort most of the time.
What would be very useful would be a new utility I've nicknamed the Region
Historian. You give it the text name of a region, and it will track down the
log messages relevant to it in the master and regionserver logs. Then, it will
interleave the messages in such a way that the timestamps correctly list the
order of events. The result is a log summary that accurately describes what
happened to a region during it's lifetime, making it much easier to try and
figure out where something went wrong.
Other things it could do would be replace cryptic log messages with simple
events like "the region was split into a and b", "the region was assigned to
server x", and trace the lineage of a region backwards to its parent before it
came into existence.
I'm sure there are other things we would think up that would be useful as well.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
