accumulo-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ott, Charles H." <>
Subject RE: No info for Accumulo Master on Monitor Overview page
Date Fri, 07 Jun 2013 13:56:59 GMT
I had the exact same issue a couple weeks back.


I was able to find out what specific HDFS path had permission issues by switching the Monitor
logger to DEBUG mode.  Then a chmod 775 fixed the issue by giving the group write permissions.


From: []
On Behalf Of Terry P.
Sent: Thursday, June 06, 2013 6:13 PM
Subject: Re: No info for Accumulo Master on Monitor Overview page


In our installation the hdfs account has hdfs as his primary group and hadoop as a secondary
group.  Our accumulo account has accumulo as his primary group.

I added both hdfs and hadoop as secondary groups for the accumulo account, but no joy -- still
a blank Accumulo Master summary box on the overview page.

So do both the accumulo and hdfs users have to have the same primary group then?  

I put accumulo into a separate group in order to protect the shared secret in accumulo-site.xml,
but I guess the better approach is to have both accumulo and hdfs in the same Linux group
and just protect this file by making it readable by owner only?  If both accumulo and hdfs
users must have the same primary group, looks like that's about the only option.


On Thu, Jun 6, 2013 at 4:57 PM, Eric Newton <> wrote:

Yea, that's a 1.4.2 issue.  You can work around it by putting the accumulo and hdfs accounts
into the same group, or just ignore the display issue.







On Thu, Jun 6, 2013 at 5:48 PM, Terry P. <> wrote:

Hi Eric,
Sorry I should have thought of including a screenshot.  I've attached one to this email --
first one I've done, I hope it works just like a regular attachment?

To ensure I had a clean monitor log, I shutdown Accumulo and started it up again.  First there
are all the [server.Accumulo] entries, here's the head of that which looks good:

2013-06-06 21:34:37,823 [server.Accumulo] INFO :  monitor starting
2013-06-06 21:34:37,824 [server.Accumulo] INFO :  Instance 22e13d96-d1ac-45c7-9d90-ae2e813e983c
2013-06-06 21:34:37,841 [server.Accumulo] INFO :  Data Version 4
2013-06-06 21:34:37,841 [server.Accumulo] INFO :  Attempting to talk to zookeeper
2013-06-06 21:34:38,026 [server.Accumulo] INFO :  Zookeeper connected and initialized, attemping
to talk to HDFS
2013-06-06 21:34:38,030 [server.Accumulo] INFO :  Connected to HDFS
2013-06-06 21:34:38,034 [server.Accumulo] INFO :  gc.cycle.delay = 5m
2013-06-06 21:34:38,034 [server.Accumulo] INFO :  gc.cycle.start = 30s
2013-06-06 21:34:38,034 [server.Accumulo] INFO :  gc.port.client = 50091
2013-06-06 21:34:38,034 [server.Accumulo] INFO :  gc.threads.delete = 16
2013-06-06 21:34:38,034 [server.Accumulo] INFO :  general.classpaths =

Then at the very end I found (with only INFO messages in between):

2013-06-06 21:34:39,132 [monitor.Monitor] WARN :
        at org.apache.accumulo.server.monitor.Monitor.fetchData(
        at org.apache.accumulo.server.monitor.Monitor$
        at Source)

That's the last entry in the monitor log.  

The second image I attached shows the Master Status page, showing there is no problem with
that display.

This is Accumulo 1.4.2 running as linux account 'accumulo' -- HDFS runs as the hdfs account,
which is why the NameNode section shows "permission denied."  NameNode and Accumulo Master
reside on the same server.  OS is Red Hat Enterprise Linux 6.3 64-bit.

Thanks in advance,


On Thu, Jun 6, 2013 at 2:58 PM, Eric Newton <> wrote:

Would you have a screenshot?  Any messages in the monitor log?





On Thu, Jun 6, 2013 at 2:44 PM, Terry P. <> wrote:

Greetings all,
We have two Accumulo clusters built from essentially the same build procedure.  Everything
is running well with the exception that on the Accumulo Monitor Overview web page, the Accumulo
Master box is blank -- the "Accumulo Master" title/hyperlink works (takes you to the "Master
Server" page), but nothing is in the box.  The NameNode, JobTracker, and Zookeeper boxes are
all populated.

On the Master Server page, I see the Master Status that shows 3 Online Tablet Servers, Loggers,
Last GC, etc.  It also shows the Table List.  The Tablet Servers page looks good.

In these small clusters we have one Accumulo Master that runs on the NameNode, 3 DataNodes,
3 Zookeepers.  I'm in the process of firing up a Secondary NameNode which will also run an
Alternate Accumulo Master in case the Master on the NameNode were to fail for some reason,
but I have not fired up the Accumulo processes on the Secondary NameNode server yet at all.


Any idea where I can look to try and determine why the Accumulo Master box is empty?  It's
not really a big deal to me, but I can see an Operator asking questions about it someday ;-)

Thanks and best regards,






View raw message