Balancer is not available

[#1]

Balancer is not active

http://www.cloudera.com/content/cloudera-content/cloudera-docs/CM4Ent/4.5.3/Cloudera-Manager-Enterpr...

I see 'Rebalance' option in the list, but it's not active.

Why?

[#2]

Hi Sergey,

For some reason do you lack a Role type of "Balancer" within that HDFS config? A Balancer role must be present in order for that option to be available. Check in HDFS > Instances to see if a Balancer exists. If not, use the Add button to assign it to one host (it's not terribly critical which host you assign it to).

[#3]

Hi, it does exist. I did use it last week.

Now it's not available.

Looks like it's still running, that is why it's not available.

2014-01-23 16:05:51,772 INFO  [pool-968-thread-61] balancer.Balancer (Balancer.java:dispatch(344)) - Moving block 2660451847257582750 from 10.66.49.199:50010 to 10.66.62.56:50010 through 10.66.49.157:50010 is succeeded.

[#4 · Accepted solution]

The balancer's state is only ever N/A (Not Applicable) or Busy. You should not be concerned if you see an N/A state there.

The balancer role runs whenever you run the Rebalance command, and at all other times it will be in the N/A state. Roles like Gateways and the Balancer that are never started / stopped via the Start / Stop commands usually have the N/A state.

[#5]

Hi, It confuses a little.

CM says that balancer is stopped:

But commands interface says it is running: