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From Harsh J <ha...@cloudera.com>
Subject Re: Need help, Can I disable datanode block report?
Date Wed, 10 Apr 2013 08:37:56 GMT
While upgrading is safe and works, note that 0.20.2 -> 1.0.4 is not
backwards compatible. That is, existing 0.20.2 clients may fail to work
with 1.0.4 services, if left un-upgraded as well.

Regarding specifying a great length of delay in block reports, it may
affect a few operations that depend on most current block info at the
NameNode, but I can't imagine a very critical issue being caused as a
result of that. You should be OK (afaik) but certainly either apply
HDFS-2379, or upgrade, soon.


On Wed, Apr 10, 2013 at 1:55 PM, Xibin Liu <xibin.liu.cn@gmail.com> wrote:

> Is upgrade from 0.20.2 to 1.0.4 safe? I have nearly 100T data and the data
> are very important.
>
>
> 2013/4/10 Harsh J <harsh@cloudera.com>
>
>> Xibin,
>>
>> I'd recommend upgrading. This was addressed quite a while ago with
>> HDFS-2379.
>>
>>
>> On Wed, Apr 10, 2013 at 1:35 PM, Xibin Liu <xibin.liu.cn@gmail.com>wrote:
>>
>>> hi all,
>>> My data nodes have very large disks(20T+), and when data node reports
>>> block info, the hdfs will not be able to read or write. Can I disable this
>>> feature or give it a very long interval without risk? My hadoop version is
>>> 0.20.2.
>>>
>>> --
>>> Thanks & Regards
>>> Benjamin Liu
>>>
>>>
>>
>>
>> --
>> Harsh J
>>
>
>
>
> --
> Thanks & Regards
> Benjamin Liu
>
>


-- 
Harsh J

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