[jira] [Commented] (HBASE-18880) Failed to start rest server if the value of hbase.rest.threads.max is too small.

["Sean Busbey (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-18880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16180836#comment-16180836 ] 

Sean Busbey commented on HBASE-18880:
-------------------------------------

change looks reasonable. I changed the jira status to "patch submitted" so we can get a QA run in.

> Failed to start rest server if the value of hbase.rest.threads.max is too small.
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-18880
>                 URL: https://issues.apache.org/jira/browse/HBASE-18880
>             Project: HBase
>          Issue Type: Bug
>          Components: REST
>    Affects Versions: 3.0.0, 2.0.0-alpha-4
>            Reporter: Guangxu Cheng
>            Assignee: Guangxu Cheng
>            Priority: Critical
>             Fix For: 3.0.0, 2.0.0-alpha-4
>
>         Attachments: HBASE-18880.master.v0.patch
>
>
> After HBASE-18224, Jetty has be updated to 9.4.6, and it requires more threads to start up.
> If the value of hbase.rest.threads.max is too small, the rest server will fail to start.
> What I observed was as follows:
> 1. The process did not exit. (At the beginning, I thought the rest server has been start normally because of the process exists.)
> 2. Can't connect to the rest server and I didn't found any exception log in ***.log.
> 3. the main thread has exited (jstack log).
> 4. Found the exception information from ***.out.
> {code}
> java.lang.IllegalStateException: Insufficient threads: max=5 < needed(acceptors=1 + selectors=8 + request=1)
>         at org.eclipse.jetty.server.Server.doStart(Server.java:414)
>         at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
>         at org.apache.hadoop.hbase.rest.RESTServer.main(RESTServer.java:360)
> {code}
> I think the process should exit and log the information in ***.log when it happens.
> So that the user can directly discover that the rest server is abnormal.



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