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From "vitthal (Suhas) Gogate (JIRA)" <>
Subject [jira] [Created] (AMBARI-517) Dashboard shows HDFS is down though it's still running
Date Tue, 05 Jun 2012 20:51:22 GMT
vitthal (Suhas) Gogate created AMBARI-517:

             Summary: Dashboard shows HDFS is down though it's still running
                 Key: AMBARI-517
             Project: Ambari
          Issue Type: Bug
    Affects Versions: ambari-186
            Reporter: vitthal (Suhas) Gogate
         Attachments: AMBARI-517.patch

This defect occasionally occurs when the jmx over http call to respective service master times
out due to load on the service master or network problem. e.g. error message in the httpd/error_log
file is,

error_log:Mon Jun 04 12:56:07 2012 error client
Error when accessing jmx info: , url=,
errno=28, error=Operation timed out after 1 seconds with 0 bytes received, referer:

Solution for this is to increase the timeout (currently 1 sec) to 2 or 3 seconds. Although
drawback of increasing timeout is, when one of the services (HDFS, MR, HBASE) is down, backend
call will always timeout for that service and so will take that much time to load the page.
Although this is not a common scenario to have one of the installed services down for long
time, I would recommend to increase the timeout to 3 secs to lower the chances of happening
this problem on the slower nodes and network. 

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