SplitTransaction.splitStoreFiles slows splits a lot
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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:
{noformat}
// TODO: If the below were multithreaded would we complete steps in less
// elapsed time? St.Ack 20100920
{noformat}
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