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https://issues.apache.org/jira/browse/HBASE-20268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16417711#comment-16417711
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Mike Drob commented on HBASE-20268:
-----------------------------------
Spent time digging into this, we have about 5 seconds of starting the JVM, 5
seconds of starting the IRB, and 5 seconds of everything else. Unfortunately, I
wasn't able to make much progress on either front.
Leaving this wiki page here for now
https://github.com/jruby/jruby/wiki/Improving-startup-time
> It takes more than 15 seconds to bring up hbase shell
> -----------------------------------------------------
>
> Key: HBASE-20268
> URL: https://issues.apache.org/jira/browse/HBASE-20268
> Project: HBase
> Issue Type: Improvement
> Components: shell
> Affects Versions: 2.0.0-alpha-4
> Reporter: huaxiang sun
> Assignee: Mike Drob
> Priority: Major
>
> On a hbase 2.0 based cluster, it takes more than 15 seconds to bring up hbase
> shell.
> Output:
> {noformat}
> # [root@hsun-1 ~]# echo exit | time /usr/java/default/bin/java -jar
> /opt/cloudera/parcels/CDH/jars/jruby-complete-9.1.10.0.jar -S irb
> # Switch to inspect mode.
> # exit
> # 9.81user 0.30system 0:03.59elapsed 281%CPU (0avgtext+0avgdata
> 308672maxresident)k
> # 0inputs+776outputs (0major+79787minor)pagefaults 0swaps
> #
> # [root@hsun-1 ~]# echo exit | time hbase shell
> # Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is
> deprecated and will likely be removed in a future release
> # HBase Shell
> # Use "help" to get list of supported commands.
> # Use "exit" to quit this interactive shell.
> # Version 2.0.0-cdh6.0.x-SNAPSHOT, rUnknown, Thu Mar 22 12:30:22 PDT 2018
> # Took 0.0040 seconds
> # exit
> # 33.92user 1.20system 0:15.21elapsed 230%CPU (0avgtext+0avgdata
> 360928maxresident)k
> # 0inputs+1064outputs (0major+176658minor)pagefaults 0swaps
> {noformat}
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