Hardly voodoo, but also not something that can be done casually. You need
strong transactional guarantees from the file system layer to do this.
And yes, it does come down to something like groups of group commits. It
didn't require patching the layer below dfsclient so much as correct and
caref
Ted, you seem to be describing voodoo? Are you talking of a group
commit of the group commits? Bigger batches at the layer below
dfsclient?
St.Ack
On Mon, Jul 11, 2011 at 11:57 AM, Ted Dunning wrote:
> On Mon, Jul 11, 2011 at 11:22 AM, Joey Echeverria wrote:
>
>> On Mon, Jul 11, 2011 at 12:47
No, the semantics do not change.
On Mon, Jul 11, 2011 at 12:37 PM, Joey Echeverria wrote:
> > :-)
> >
> > No changes were required in HBase to enable this.
>
> Do the semantics of sync change? Do you pause one or more outstanding
> syncs, sync a group of data (4KB maybe) and then return from all
On Mon, Jul 11, 2011 at 12:37 PM, Joey Echeverria wrote:
> Do the semantics of sync change? Do you pause one or more outstanding
> syncs, sync a group of data (4KB maybe) and then return from all of
> those outstanding syncs simultaneously?
Group commit is a standard storage technique to trade a
On Mon, Jul 11, 2011 at 12:37 PM, Joey Echeverria wrote:
> > :-)
> >
> > No changes were required in HBase to enable this.
>
> Do the semantics of sync change? Do you pause one or more outstanding
> syncs, sync a group of data (4KB maybe) and then return from all of
> those outstanding syncs simu
> :-)
>
> No changes were required in HBase to enable this.
Do the semantics of sync change? Do you pause one or more outstanding
syncs, sync a group of data (4KB maybe) and then return from all of
those outstanding syncs simultaneously?
-Joey
--
Joseph Echeverria
Cloudera, Inc.
443.305.9434
On Mon, Jul 11, 2011 at 11:22 AM, Joey Echeverria wrote:
> On Mon, Jul 11, 2011 at 12:47 PM, Ted Dunning
> wrote:
> > Also, on MapR, you get another level of group commit above the row level.
> > That takes the writes even further from the byte by byte level.
>
> Is this done with an HBASE patc
On Mon, Jul 11, 2011 at 12:47 PM, Ted Dunning wrote:
> Also, on MapR, you get another level of group commit above the row level.
> That takes the writes even further from the byte by byte level.
Is this done with an HBASE patch? I don't see how this could be done
merely at the FS layer.
-Joey
t; (via Tom White)
>
>
> - Original Message -
> > From: Arvind Jayaprakash
> > To: user@hbase.apache.org; Andrew Purtell
> > Cc:
> > Sent: Monday, July 11, 2011 6:34 AM
> > Subject: Re: Hbase performance with HDFS
> >
> > On Jul 07, Andrew Purtell wrote
White)
- Original Message -
> From: Arvind Jayaprakash
> To: user@hbase.apache.org; Andrew Purtell
> Cc:
> Sent: Monday, July 11, 2011 6:34 AM
> Subject: Re: Hbase performance with HDFS
>
> On Jul 07, Andrew Purtell wrote:
>>> Since HDFS is mostly write o
On Jul 07, Andrew Purtell wrote:
>> Since HDFS is mostly write once how are updates/deletes handled?
>
>Not mostly, only write once.
>
>Deletes are just another write, but one that writes tombstones
>"covering" data with older timestamps.
>
>When serving queries, HBase searches store files back in
h by hitting back. - Piet Hein (via
> Tom White)
>
>
> - Original Message -----
>> From: Mohit Anchlia
>> To: user@hbase.apache.org
>> Cc:
>> Sent: Thursday, July 7, 2011 3:02 PM
>> Subject: Re: Hbase performance with HDFS
>>
>>T hanks! I u
rthy of attack prove their worth by hitting back. - Piet Hein (via
Tom White)
- Original Message -
> From: Mohit Anchlia
> To: user@hbase.apache.org
> Cc:
> Sent: Thursday, July 7, 2011 3:02 PM
> Subject: Re: Hbase performance with HDFS
>
>T hanks! I understand
ation has already taken place.
>
> -Original Message-
> From: Mohit Anchlia [mailto:mohitanch...@gmail.com]
> Sent: Thursday, July 07, 2011 2:02 PM
> To: user@hbase.apache.org; Andrew Purtell
> Subject: Re: Hbase performance with HDFS
>
> Thanks Andrew. Really helpful.
, July 07, 2011 2:02 PM
To: user@hbase.apache.org; Andrew Purtell
Subject: Re: Hbase performance with HDFS
Thanks Andrew. Really helpful. I think I have one more question right
now :) Underneath HDFS replicates blocks by default 3. Not sure how it
relates to HFile and compactions. When compaction
attack prove their worth by hitting back. - Piet Hein (via
> Tom White)
>
>
>>
>>From: Mohit Anchlia
>>To: Andrew Purtell
>>Cc: "user@hbase.apache.org"
>>Sent: Thursday, July 7, 2011 12:30 PM
>>Subject: Re: Hb
ack prove their worth by hitting back. - Piet Hein (via
Tom White)
>
>From: Mohit Anchlia
>To: Andrew Purtell
>Cc: "user@hbase.apache.org"
>Sent: Thursday, July 7, 2011 12:30 PM
>Subject: Re: Hbase performance with HDFS
>
>Thanks t
are compacted as
>> needed, because as you point out GFS and HDFS are optimized for
>>streaming
>> sequential reads and writes.
>>
>> Best regards,
>>
>> - Andy
>> Problems worthy of attack prove their worth by hitting back. - Piet Hein
>> (via Tom White)
>>
>> _
Problems worthy of attack prove their worth by hitting back. - Piet Hein
> (via Tom White)
>
>
> From: Mohit Anchlia
> To: user@hbase.apache.org; Andrew Purtell
> Sent: Thursday, July 7, 2011 11:53 AM
> Subject: Re: Hbase performance with HDFS
>
> I have looked at big
back. - Piet
>>Hein (via Tom White)
>>
>>
>>>________
>>>From: Mohit Anchlia
>>>To: user@hbase.apache.org
>>>Sent: Thursday, July 7, 2011 11:12 AM
>>>Subject: Hbase performance with HDFS
>>>
>>>I
>> Best regards,
>>
>>
>> - Andy
>>
>> Problems worthy of attack prove their worth by hitting back. - Piet Hein
>> (via Tom White)
>>
>>
>>>________
>>>From: Mohit Anchlia
>>>To: user@
gt;> >
>>> > Start here: http://labs.google.com/papers/bigtable.html
>>> >
>>> > Best regards,
>>> >
>>> >
>>> > - Andy
>>> >
>>> > Problems worthy of attack prove their worth by hitting back. -
t;
>> > Best regards,
>> >
>> >
>> > - Andy
>> >
>> > Problems worthy of attack prove their worth by hitting back. - Piet Hein
>> (via Tom White)
>> >
>> >
>> >>
>> >
. - Piet Hein
> (via Tom White)
> >
> >
> >>________
> >>From: Mohit Anchlia
> >>To: user@hbase.apache.org
> >>Sent: Thursday, July 7, 2011 11:12 AM
> >>Subject: Hbase performance with HDFS
> >>
> >&g
attack prove their worth by hitting back. - Piet Hein (via
> Tom White)
>
>
>>
>>From: Mohit Anchlia
>>To: user@hbase.apache.org
>>Sent: Thursday, July 7, 2011 11:12 AM
>>Subject: Hbase performance with HDFS
>>
>
sday, July 7, 2011 11:12 AM
>Subject: Hbase performance with HDFS
>
>I've been trying to understand how Hbase can provide good performance
>using HDFS when purpose of HDFS is sequential large block sizes which
>is inherently different than of Hbase where it's more random and ro
I've been trying to understand how Hbase can provide good performance
using HDFS when purpose of HDFS is sequential large block sizes which
is inherently different than of Hbase where it's more random and row
sizes might be very small.
I am reading this but doesn't answer my question. It does say
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