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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3499) Users upgrading to 0.90.0 need to have their .META. table updated with the right MEMSTORE_SIZE
Date Wed, 02 Feb 2011 19:41:29 GMT
Users upgrading to 0.90.0 need to have their .META. table updated with the right MEMSTORE_SIZE
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                 Key: HBASE-3499
                 URL: https://issues.apache.org/jira/browse/HBASE-3499
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.90.0
            Reporter: Jean-Daniel Cryans
            Priority: Blocker
             Fix For: 0.90.1


With Jack Levin, we were able to figure that users that are upgrading from a 0.20.x era cluster
have their .META. schema set with a 16KB MEMSTORE_SIZE. This was done in order to minimize
lost meta rows when append wasn't available but even if we changed it in HTD, we also have
to make sure all users upgrading to 0.90 have it changed too.

In Jack's case, he ended up with 2143 storefiles in .META. during a cold start, slowing everything
down. He reported a few times in the past that his .META. was always extremely busy.

We should be able to do it as a one-off thing in HMaster when opening .META. (an update in
place).

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