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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3308) SplitTransaction.splitStoreFiles slows splits a lot
Date Fri, 03 Dec 2010 21:42:11 GMT
SplitTransaction.splitStoreFiles slows splits a lot

                 Key: HBASE-3308
                 URL: https://issues.apache.org/jira/browse/HBASE-3308
             Project: HBase
          Issue Type: Improvement
            Reporter: Jean-Daniel Cryans
            Priority: Critical
             Fix For: 0.92.0

Recently I've been seeing some slow splits in our production environment triggering timeouts,
so I decided to take a closer look into the issue.

According to my debugging, we spend almost all the time it takes to split on creating the
reference files. Each file in my testing takes at least 300ms to create, and averages around
600ms. Since we create two references per store file, it means that a region with 4 store
file can easily take up to 5 seconds to split just to create those references.

An intuitive improvement would be to create those files in parallel, so at least it wouldn't
be much slower when we're splitting a higher number of files. Stack left the following comment
in the code:

// TODO: If the below were multithreaded would we complete steps in less
// elapsed time?  St.Ack 20100920

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