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

["Guangxu Cheng (JIRA)" <ji...@apache.org>]

Guangxu Cheng created HBASE-18880:
-------------------------------------

             Summary: 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
            Reporter: Guangxu Cheng
            Assignee: Guangxu Cheng
             Fix For: 3.0.0, 2.0.0-alpha-4


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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