Administrative functions for table/region maintenance
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Key: HBASE-1082
URL: https://issues.apache.org/jira/browse/HBASE-1082
Project: Hadoop HBase
Issue Type: New Feature
Affects Versions: 0.19.0
Reporter: Jonathan Gray
Fix For: 0.19.0
It would be useful to have some administrative functions available through
HTable or HBaseAdmin. The two functions I'm thinking of right now are to force
memcache flushes (on all regions, or individually specified) and to run major
compactions (on all regions, or individually specified).
One reason to have this is currently major compactions run once a day by
default. The time that they run is related to when you brought up your cluster
or created the tables. In my case, this has been during peak load rather than
offpeak times. We have times that we run other administrative tasks like
backups, cleanup, etc... during off times, and this would be a good time to
also trigger major compactions and memcache flushes.
Memcache force flushing can also be useful in the case that your cluster starts
to have issues. They might be isolated to a single region or regionserver, but
with lots of edits sitting in memcache and potentially unappended hlogs, you
want to just flush things out to remove the possibility of losing anything.
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