stack created HBASE-20800:
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Summary: Master orchestrated compactions
Key: HBASE-20800
URL: https://issues.apache.org/jira/browse/HBASE-20800
Project: HBase
Issue Type: Umbrella
Components: Compaction
Reporter: stack
Assignee: Mohit Goel
An umbrella issue for having compactions go via the Master so we can have a
centralized arbitrator of cluster i/o. If we put Master in the way, we can do
stuff like:
* Ask the Master for current cluster compaction state; what is running, what
is blocked
* Master can manage cluster-wide compaction policy and/or throttling/or
blocking of compaction i/os.
* Master can schedule when and where compactions run so we can guard against
the pathological where all RegionServers decide now is the time to major
compact bringing on a compaction storm.
Other side-benefits might include being able to farm out the compaction work to
another process -- e.g. the splice machine model of having spark run the
compactions -- or just to a separate compactor that we might i/o nice.
* We'll need to figure how to externalize the CompactionRequest so it can be
passed over RPC.
* We'll need to have something like a CompactionManager in the Master process
that keeps up current cluster state.
MOB needs a compaction fabric it can use. Its compactions are currently
Master-based only and so don't scale. It could make use of this mechanism to
ask the Master to farm out its compaction requests.
This is an umbrella issue. I thought I'd filed one already on this topic but
can't find it. Will shut it down if I trip over it.
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