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HDFS, mail # dev - Decommission DataNode


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Re: Decommission DataNode
lei liu 2013-10-29, 08:48
Should the datanode be shutdown when it is Decommissioned?

I think if this is bug,  I can fix it.
2013/10/29 lei liu <[EMAIL PROTECTED]>

> HI Steve,  thanks for your reply.
>
>
> There is the question in hadoop-2.2.0.
>
>
> In hadoop-2.2.0, there are below code in DatanodeManager.handleHeartbeat
> method :
>  // Check if this datanode should actually be shutdown instead.
>         if (nodeinfo != null &&* nodeinfo.isDisallowed()*) {
>           setDatanodeDead(nodeinfo);
>           throw new DisallowedDatanodeException(nodeinfo);
>       }
>
>
> In hadoop-1.0.1, there are below code in FSNamesystem.handleHeartbeat
> method:
> // Check if this datanode should actually be shutdown instead.
>         if (nodeinfo != null && shouldNodeShutdown(nodeinfo)) {
>           setDatanodeDead(nodeinfo);
>           throw new DisallowedDatanodeException(nodeinfo);
>         }
>
> private boolean shouldNodeShutdown(DatanodeDescriptor node) {
>     return (node.isDecommissioned());
>   }
>
>
> So in hadoop-1.0.1, when the datanode is Decommissioned, the datanode will
> be kill by NameNode, but in hadoop-2.2.0, when the datanode is
> Decommissioned, the  datanode still is lived.
>
>
>
> 2013/10/28 Steve Loughran <[EMAIL PROTECTED]>
>
>> sounds like a question for the cloudera support forums
>>
>>
>> On 28 October 2013 08:59, lei liu <[EMAIL PROTECTED]> wrote:
>>
>> > In CDH3u5, when the DataNode is Decommissioned, the DataNode progress
>> will
>> > be  shutdown by NameNode.
>> >
>> > But In CDH4.3.1, when the DataNode is Decommissioned, the DataNode
>> progress
>> > will be  not shutdown by NameNode.
>> >
>> >
>> > When the datanode is Decommissioned, why the datanode is not
>> automatically
>> > shutdown by NameNode in CDH4.3.1?
>> >
>> >
>> > Thanks,
>> >
>> > LiuLei
>> >
>>
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>