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From "Gang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12820) Decommissioned datanode is counted in service cause datanode allcating failure
Date Mon, 20 Nov 2017 09:11:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16258975#comment-16258975
] 

Gang Xie commented on HDFS-12820:
---------------------------------

And I believe this issue still in the latest version

> Decommissioned datanode is counted in service cause datanode allcating failure
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-12820
>                 URL: https://issues.apache.org/jira/browse/HDFS-12820
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: block placement
>    Affects Versions: 2.4.0
>            Reporter: Gang Xie
>
> When allocate a datanode when dfsclient write with considering the load, it checks if
the datanode is overloaded by calculating the average xceivers of all the in service datanode.
But if the datanode is decommissioned and become dead, it's still treated as in service, which
make the average load much more than the real one especially when the number of the decommissioned
datanode is great. In our cluster, 180 datanode, and 100 of them decommissioned, and the average
load is 17. This failed all the datanode allocation. 
> private void subtract(final DatanodeDescriptor node) {
>       capacityUsed -= node.getDfsUsed();
>       blockPoolUsed -= node.getBlockPoolUsed();
>       xceiverCount -= node.getXceiverCount();
>     {color:red}  if (!(node.isDecommissionInProgress() || node.isDecommissioned())) {{color}
>         nodesInService--;
>         nodesInServiceXceiverCount -= node.getXceiverCount();
>         capacityTotal -= node.getCapacity();
>         capacityRemaining -= node.getRemaining();
>       } else {
>         capacityTotal -= node.getDfsUsed();
>       }
>       cacheCapacity -= node.getCacheCapacity();
>       cacheUsed -= node.getCacheUsed();
>     }



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