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From "J.Andreina (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3295) Mismatch in number of bytes already moved and number of bytes being moved in balancer report
Date Wed, 18 Apr 2012 10:57:42 GMT
Mismatch in number of bytes already moved and number of bytes being moved in balancer report
--------------------------------------------------------------------------------------------

                 Key: HDFS-3295
                 URL: https://issues.apache.org/jira/browse/HDFS-3295
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: balancer
    Affects Versions: 0.23.0
            Reporter: J.Andreina
             Fix For: 0.24.0


Scenario:
Replication factor = 1,fs.defaultFS=hdfs://namenodeip:port,dfs.namenode.rpc-address=namenodeip:port.
step 1: started DN1.Pumped 4.67GB of data
step 2: started DN2.
step 3: issued the balancer cmd(./start-balancer.sh -threshold 1)

Totally  848.41 MB  has been moved to 2DN and took 4 iterations to move the blocks to 2DN.

But in balancer output in all the iterations the number of bytes already moved is alway 0KB
 and there is mismatch in the Bytes being moved with the bytes left to move

Balancer output for 2nd Iteration
=================================
{noformat}
Time Stamp               Iteration#  Bytes Already Moved  Bytes Left To Move  Bytes Being
Moved
Apr 18, 2012 12:41:20 PM          0                 0 KB           848.41 MB          151.18
MB
Apr 18, 2012 1:06:46 PM           1                 0 KB           646.02 MB          151.18
MB
Apr 18, 2012 1:10:28 PM           2                 0 KB           417.43 MB          151.18
MB
Apr 18, 2012 1:14:04 PM           3                 0 KB           223.84 MB          151.18
MB
Apr 18, 2012 1:18:10 PM           4                 0 KB            30.34 MB          151.18
MB{noformat}

In the above balancer output

•Bytes already moved is 0KB
• In 3 rd iterarion Bytes left to move is 223.84 MB but Bytes being moved is 151.18 MB .
So in next iteration the bytes left to move should be 223.84 MB - 151.18 MB 


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