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HBase >> mail # dev >> read short circuit


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Re: read short circuit
That's https://issues.apache.org/jira/browse/HBASE-4867

On Thu, Sep 13, 2012 at 10:57 AM, Jesse Yates <[EMAIL PROTECTED]> wrote:
> There was a jira a while back (can't remember the number) that I think came
> from the Facebook fellas to have multiple hbase-site.xmls, with a naming
> scheme such that you can do layering of configurations.
>
> What ever happened to that?
> -------------------
> Jesse Yates
> @jesse_yates
> jyates.github.com
>
>
> On Thu, Sep 13, 2012 at 10:44 AM, Andrew Purtell <[EMAIL PROTECTED]>wrote:
>
>> Making it the default seems reasonable.
>>
>> For <= 0.94, the security profile has a separate hbase-site.xml file
>> under test resources where there it could be defaulted as off.  Reason
>> is the local block sharing requires some shared group membership
>> between HBase and HDFS service accounts that might be objectionable in
>> a secure setting. So we should have test coverage with it off.
>>
>> On Thu, Sep 13, 2012 at 9:42 AM, n keywal <[EMAIL PROTECTED]> wrote:
>> > It's all in the "pretty much" :-)
>> > Should we make it the default (i.e. recommending it in the doc, emitting
>> a
>> > warning if it's not set) for all installation ?
>> > Or would it make sense to separate the store and wal cases, meaning that
>> we
>> > need a change in hdfs to make this possible?
>> >
>> >
>> > On Thu, Sep 13, 2012 at 6:30 PM, Jean-Daniel Cryans <[EMAIL PROTECTED]
>> >wrote:
>> >
>> >> On Thu, Sep 13, 2012 at 7:58 AM, n keywal <[EMAIL PROTECTED]> wrote:
>> >> > Hi,
>> >> >
>> >> > Is there any known counter indication for read short circuit?
>> >> > I had a look at JD's presentation from January. It was tested vs.
>> HBase
>> >> as
>> >> > a whole; and still recommended for nearly all cases.
>> >>
>> >> Pretty much.
>> >>
>> >> >
>> >> > We could make it at least the default when reading HLog files (even
>> if it
>> >> > seems it's a 'per client" config, there is may be something to look
>> at as
>> >> > well)?
>> >>
>> >> You have to add 2 configs in hdfs-site.xml, which we can't do from
>> HBase.
>> >>
>> >> J-D
>> >>
>>
>>
>>
>> --
>> Best regards,
>>
>>    - Andy
>>
>> Problems worthy of attack prove their worth by hitting back. - Piet
>> Hein (via Tom White)
>>

--
Best regards,

   - Andy

Problems worthy of attack prove their worth by hitting back. - Piet
Hein (via Tom White)