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From Jonathan Ellis <jbel...@gmail.com>
Subject the release after 0.5
Date Fri, 08 Jan 2010 20:06:22 GMT
In the month since 0.5 was branched, we've already made some
significant progress, particularly in performance.  I can't find a way
to easily link the full list in Jira, but these include

  408+669 (mmapping sstables for reads instead of using buffered I/O):
~50% speed improvement
  658 (better write concurrency): ~1000% improvement when cluster is
in degraded state
  675 (faster communication between nodes): ~100% improvement of reads
and writes
  678 (row level caching): up to 120% improvement of reads (workload dependent)

We also have some other interesting tickets done:
  336: add the ability to insert data to multiple rows at once -- like
multiget, but for writes
  535: expose StorageProxy to use as a fat client (with
StorageService.initClient)
  599: give some visibility of what Compaction is busy doing (can be a
major source of "why is it slow?")

We have a lot of other issues tagged 0.9
(https://issues.apache.org/jira/secure/IssueNavigator.jspa?reset=true&mode=hide&sorter/order=DESC&sorter/field=priority&resolution=-1&pid=12310865&fixfor=12314361),
but the above issues and the others done so far are already useful
enough to release, both because it helps our existing users of 0.5
[note that none of these introduce compatibility issues of any sort,
which makes upgrading especially easy], and because improving
performance by that much makes us look better, which helps grow the
community. :)

On the other hand, creating and stabilizing and testing a new release
(that is not bugfix-only) is a non-negligible amount of overhead, and
I would give extra weight to Eric Evans's opinion here as release
manager.

-Jonathan

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