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From ch huang <justlo...@gmail.com>
Subject Re: issue about add disk on DN
Date Thu, 07 Nov 2013 05:25:59 GMT
yes ,but if one of disks is full,the totol io bandwidth also will reduce

On Thu, Nov 7, 2013 at 11:31 AM, Andrew Wright <agwlists@gmail.com> wrote:

> It is possible to rebalance across hosts but I do not believe it is
> possible to rebalance within a data node. Best chance to decommission the
> host have all the data redistribute to other nodes and then add the node
> back into the cluster and rebalance then.
>
> Also, the dn will identify when the individual dura are full and no longer
> allow writes to the disks.
>
>
> On Wednesday, November 6, 2013, ch huang wrote:
>
>> 这个好像不太合理吧,如果我原来3块盘的话,变成6块盘需要由3个拷贝改成六个拷贝?
>> 那我如果弄完后改回3个拷贝原来的数据还是存6拷贝的呀,那不是浪费空间?
>>
>> On Thu, Nov 7, 2013 at 9:44 AM, 金杰 <hellojinjie@gmail.com> wrote:
>>
>>>  yes, you can rebalance them. try hdfs rebalance. Or, you can first
>>> increment the replica by 1, then decrement by 1.
>>>
>>>
>>> Best Regards
>>> 金杰 (Jay Jin)
>>>
>>>
>>> On Thu, Nov 7, 2013 at 8:34 AM, ch huang <justlooks@gmail.com> wrote:
>>>
>>>> hi,all:
>>>>         i have a DN,and i mount the two disk ,one disk for
>>>> /data/dataspace/1, and one disk for /data/dataspace/2,
>>>> the two disk is almost full, so i add a new disk,and modify the config
>>>> file,now
>>>> disk3 mount on /data/dataspace/3 , is it possible even distribution of
>>>> data on the three disks?
>>>>
>>>
>>>
>>

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