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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]>
>> I'd recommend upgrading. This was addressed quite a while ago with
>> On Wed, Apr 10, 2013 at 1:35 PM, Xibin Liu <[EMAIL PROTECTED]>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
>>> Thanks & Regards
>>> Benjamin Liu
>> Harsh J
> Thanks & Regards
> Benjamin Liu
Xibin Liu 2013-04-10, 08:31