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From: Todd Lipcon <todd@cloudera.com>
Date: Fri, 23 Dec 2011 10:48:21 -0800
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Subject: Re: ceph and hbase.
To: user@hbase.apache.org
Cc: hbase-user@hadoop.apache.org
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On Tue, Dec 20, 2011 at 12:56 AM, Andrey Stepachev <octo47@gmail.com> wrote=
:
> I see, that most issues addressed to HA branch.
> What version this branch is applied to? 0.22 or
> i should build hadoop from sources?

It's currently only available in the HDFS-1623 branch, which is in
active development and definitely shouldn't be used unless you plan to
help us finish debugging it :) There are still some known bugs and
deficiencies to address before we merge.

The plan is to merge it into 0.23 but not 0.22 - it will hopefully be
merged in January. We'll also make it available in CDH4 beta releases
early next year.

-Todd

>
> 20 =C4=C5=CB=C1=C2=D2=D1 2011 =C7. 11:46 =D0=CF=CC=D8=DA=CF=D7=C1=D4=C5=
=CC=D8 Todd Lipcon <todd@cloudera.com>=CE=C1=D0=C9=D3=C1=CC:
>
>> Hi Andrey,
>>
>> I don't think anyone has ever run Ceph in a production use case, much
>> less run it in a production use case with HBase.
>>
>> The SPOF problem is currently being addressed and will be available
>> for production use by the middle of next calendar year. It will be
>> available for preview/beta usage in Q1 (it's already working in
>> development setups - feel free to follow HDFS-1623 for details)
>>
>> I think you're way better off waiting for the HA NameNode support in
>> HDFS than going with an unproven FS like Ceph. Ceph certainly has
>> promise and is a nice design, but it hasn't had the years of pounding
>> that HDFS has.
>>
>> -Todd
>>
>> On Mon, Dec 19, 2011 at 10:23 PM, Andrey Stepachev <octo47@gmail.com>
>> wrote:
>> > Hi all.
>> >
>> > I have requirements to use hbase in several datacenters.
>> > But HDFS has as SPOF, so we can't use it.
>> > I plan to use ceph as the file system for hbase.
>> >
>> > In general, interested in issues of:
>> > a) use the hadoop + =D3eph in the production environment
>> > b) using hbase + ceph in the production environment
>> >
>> > In particular:
>> > Ceph Wiki states that the integration of hadoop/ceph has the problem i=
n
>> the
>> > form of modification dates of the files.
>> > Does hbase uses modification times for some critical tasks?
>> >
>> > --
>> > Andrey.
>>
>>
>>
>> --
>> Todd Lipcon
>> Software Engineer, Cloudera
>>
>
>
>
> --
> =E1=CE=C4=D2=C5=CA.


--=20
Todd Lipcon
Software Engineer, Cloudera