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https://issues.apache.org/jira/browse/HBASE-4010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13052919#comment-13052919
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Ted Yu commented on HBASE-4010:
-------------------------------
Interesting, v3 was customized to latest trunk.
TestAdmin used to pass for v2.
Now the tests were fine but JVM didn't shutdown:
{code}
"main" prio=5 tid=103000800 nid=0x100601000 in Object.wait() [100600000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Thread.join(Thread.java:1210)
- locked <7a6041b98> (a org.apache.hadoop.fs.FileSystem$ClientFinalizer)
at java.lang.Thread.join(Thread.java:1263)
at
java.lang.ApplicationShutdownHooks.runHooks(ApplicationShutdownHooks.java:79)
at
java.lang.ApplicationShutdownHooks$1.run(ApplicationShutdownHooks.java:24)
at java.lang.Shutdown.runHooks(Shutdown.java:79)
at java.lang.Shutdown.sequence(Shutdown.java:123)
at java.lang.Shutdown.exit(Shutdown.java:168)
- locked <7faf8ead8> (a java.lang.Class for java.lang.Shutdown)
at java.lang.Runtime.exit(Runtime.java:90)
{code}
> HMaster.createTable could be heavily optimized
> ----------------------------------------------
>
> Key: HBASE-4010
> URL: https://issues.apache.org/jira/browse/HBASE-4010
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.90.3
> Reporter: Jean-Daniel Cryans
> Assignee: Ted Yu
> Fix For: 0.92.0
>
> Attachments: 4010-v2.txt, 4010-v3.txt
>
>
> Looking at the createTable method in HMaster (the one that's private), we
> seem to be very inefficient:
> - We set the enabled flag for the table for every region (should be done
> only once).
> - Every time we create a new region we create a new HLog and then close it
> (reuse one instead or see if it's really necessary).
> - We do one RPC to .META. per region (we should batch put).
> This should provide drastic speedups even for those creating tables with just
> 50 regions.
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