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From "Ashish Singhi (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-3377) While Balancing more than 10 Blocks are being moved from one DN even though the maximum number of blocks to be moved in an iterations is hard coded to 5
Date Thu, 07 Jun 2012 03:57:24 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3377?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashish Singhi resolved HDFS-3377.
---------------------------------

    Resolution: Invalid
    
> While Balancing more than 10 Blocks are being moved from one DN even though the maximum
number of blocks to be moved in an iterations is hard coded to 5
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3377
>                 URL: https://issues.apache.org/jira/browse/HDFS-3377
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer
>    Affects Versions: 2.0.0-alpha
>            Reporter: J.Andreina
>
> Replication factor= 1,block size is default value
> Step 1: Start NN,DN1
> Step 2: Pump 5 GB of data.
> Step 3: Start DN2 and issue balancer with threshold value 1
> In the balancer report and the NN logs displays that more than 8 blocks are being moved
from DN1 to DN2 in one iterations But MAX_NUM_CONCURRENT_MOVES in one iterations is hard coded
to 5.
> Balancer report for 1st iteration:
> =================================
> {noformat}
> HOST-XX-XX-XX-XX:/home/Andreina/NewHadoop2nd/hadoop-2.0.0-SNAPSHOT/bin # ./hdfs balancer
-threshold 1
> 12/05/03 17:31:28 INFO balancer.Balancer: Using a threshold of 1.0
> 12/05/03 17:31:28 INFO balancer.Balancer: namenodes = [hdfs://HOST-XX-XX-XX-XX:9002]
> 12/05/03 17:31:28 INFO balancer.Balancer: p         = Balancer.Parameters[BalancingPolicy.Node,
threshold=1.0]
> Time Stamp               Iteration#  Bytes Already Moved  Bytes Left To Move  Bytes Being
Moved
> 12/05/03 17:31:30 INFO net.NetworkTopology: Adding a new node: /datacenter1/rack1/YY.YY.YY.YY:50176
> 12/05/03 17:31:30 INFO net.NetworkTopology: Adding a new node: /datacenter1/rack1/XX.XX.XX.XX:50076
> 12/05/03 17:31:30 INFO balancer.Balancer: 1 over-utilized: [Source[XX.XX.XX.XX:50076,
utilization=5.018416429773605]]
> 12/05/03 17:31:30 INFO balancer.Balancer: 1 underutilized: [BalancerDatanode[YY.YY.YY.YY:50176,
utilization=3.272819804269012E-5]]
> 12/05/03 17:31:30 INFO balancer.Balancer: Need to move 1.06 GB to make the cluster balanced.
> 12/05/03 17:31:30 INFO balancer.Balancer: Decided to move 716.13 MB bytes from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176
> 12/05/03 17:31:30 INFO balancer.Balancer: Will move 716.13 MB in this iteration
> May 3, 2012 5:31:30 PM            0                 0 KB             1.06 GB        
 716.13 MB
> 12/05/03 17:35:29 INFO balancer.Balancer: Moving block -5275260117334749945 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:36:31 INFO balancer.Balancer: Moving block -8079758341763366944 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:37:12 INFO balancer.Balancer: Moving block -7395554712490186313 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:37:45 INFO balancer.Balancer: Moving block 7805443002654525130 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:38:15 INFO balancer.Balancer: Moving block 1864290085256894184 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:40:30 INFO balancer.Balancer: Moving block 23322655230037442 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:41:24 INFO balancer.Balancer: Moving block -8839566903692469634 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:43:03 INFO balancer.Balancer: Moving block 7304385435779271887 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:43:48 INFO balancer.Balancer: Moving block -7242009026552182303 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:44:06 INFO balancer.Balancer: Moving block -2449309138254106767 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:44:55 INFO balancer.Balancer: Moving block 500930296233438046 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.
> 12/05/03 17:45:04 INFO balancer.Balancer: Moving block 2642725820310610865 from XX.XX.XX.XX:50076
to YY.YY.YY.YY:50176 through XX.XX.XX.XX:50076 is succeeded.{noformat}

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