On Mon, 2011-06-27 at 15:06 -0600, AJ wrote:
> Would anyone care to talk about their experiences with using Solandra
> along side another application that uses Cassandra (also on the same
> node)? I'm curious about any resource contention issues or
> compatibility between C* versions and Sol.
d_
> (or mongodb->gridfs)
> happy to help as I am moving down this road in general
> Thanks!
>
> /*
> Joe Stein
> http://www.linkedin.com/in/charmalloc
> Twitter: @allthingshadoop
> */
>
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David Strauss
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It's not, currently, but I'm happy to answer questions about its architecture.
On Thu, Jul 7, 2011 at 10:35, Norman Maurer
wrote:
> May I ask if its opensource by any chance ?
>
> bye
> norman
>
> Am Donnerstag, 7. Juli 2011 schrieb David Strauss :
>> I'm
?
>
> If you store large files, how large is your store per node and how does it
> handle compactions (any performance issues while compacting large data)?
>
> Also would be interesting to hear some benchmarks and performance stats for
> read/writes.
>
> Regards,
> Rus
The current version scheme in the "riptano" repository puts 1.0.0rc2 as
the successor to 1.0.0 final. I think this will resolve itself with the
1.0.1 release (or later), but it's broken right now.
[root@david-onebox ~]# yum -y update
Loaded plugins: presto
Setting up Update Process
Resolving Depen
e slower growing part. The
> lpush/ltrim usage was in here.
It's not clear just from your use of lpush/ltrim what you're doing. Some
uses can map to Cassandra's APIs with some creative reinterpretation;
others can't.
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On Fri, 2011-02-18 at 12:01 -0600, Anthony John wrote:
> Writes will go thru w/hinted handoff, read will fail
That is not correct. Hinted handoffs do not count toward reaching QUORUM
counts.[1]
[1] http://wiki.apache.org/cassandra/HintedHandoff
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David Strauss
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I just noticed that, following the Cassandra 0.8 beta release, the Apt
repository is encouraging servers in my clusters to upgrade. Beta
releases should probably be on different channels (or named differently)
than stable ones.
Better yet would be naming the packages based on the major release in
On Fri, 2011-04-22 at 13:31 -0700, Milind Parikh wrote:
> Is there a chance of getting manual conflict resolution in Cassandra?
> Please see attachment for why this is important in some cases.
You can actually already perform "manual conflict resolution" in
Cassandra by naming your columns so that
On Mon, 2011-04-25 at 15:25 -0700, Gregory Szorc wrote:
> If you don't want your APT-sourced packages to upgrade automatically,
> I suggest pinning the package.
I'm aware that I can pin the package, but it's still a workaround for
the Cassandra Apt repository not being set up according to best
pra
On Mon, 2011-04-25 at 03:50 -0700, Milind Parikh wrote:
> I suppose the term 'silently dropped' is a matter of perspective. C
> makes an explicit automated choice of latest-timestamp-wins. In
> certain situations, this is not the appropriate choice.
I would still insist that using Cassandra and ex
On Tue, 2011-04-26 at 08:57 +0200, Sasha Dolgy wrote:
> Is it possible to store an encrypted keystore_password and
> truststore_password in the cassandra.yaml? I see that the defaults
> allow cleartext which isn't suitable when negotiating with security
> specialists for sign-off of a solution...
On Wed, 2011-04-27 at 12:56 +0200, Sasha Dolgy wrote:
> "IBM WebSphere applies a hardcoded XOR. Each caracter is XOR'd with
> the caracter ‘_’, and the resulting string is encoded in base64. This
> is not cryptography, it is just enough encoding so that a casual
> glance at the file will not reveal
On Tue, 2011-04-26 at 19:03 -0500, Eric Evans wrote:
> There is one for each version now (06x, 07x, and 08x). The unstable
> suite continues to point to latest-and-greatest. The wiki has been
> updated.
Where, exactly, is this on the wiki? I had been using the CloudConfig
page [1], which still on
On Tue, 2011-04-26 at 19:03 -0500, Eric Evans wrote:
> There was already a repo for cassandra-0.6 (called 06x), it just fell
> through the cracks with the last release.
>
> There is one for each version now (06x, 07x, and 08x). The unstable
> suite continues to point to latest-and-greatest. The w
n
Cassandra.
> Thoughts? Pitfalls? Gotchas? Are we completely whacked?
Does the random partitioner support what you need?
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David Strauss
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re a entity per row,
> with the time-series data as (or in?) super columns (and maybe it
> would make sense to break those out in column families by date range).
> I'd have to think through a little more what that might mean for our
> secondary indexing needs.
>
> Thanks,
&g
On 2010-05-07 10:51, vineet daniel wrote:
> what is the benefit of creating bloom filter when cassandra writes data,
> how does it helps ?
http://wiki.apache.org/cassandra/ArchitectureOverview
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David Strauss
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es a false
> positive.
>
> See:
>
> http://spyced.blogspot.com/2009/01/all-you-ever-wanted-to-know-about.html
It is also important for identifying which SSTable files to look inside
even when a key is present.
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David Strauss
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indicate
mutually exclusive ranges of addresses, while the bloom filters may
indicate the possible presence of a key in *several* files.)
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On 2010-05-07 10:58, vineet daniel wrote:
> Is there any way to view the content of this file.
Which file?
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utes.
>
> In both cases Cassandra server contains a single node.
>
>
>
> We use Cassandra version 0.6.0 running on Windows server 2008.
>
> The client is .NET c# application.
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David Strauss
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On 2010-05-13 19:48, Steve Lihn wrote:
> Now the java community is developing a database like Mongo that is
> schema-less.
Mongo is written in C++.
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David Strauss
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right question for Facebook's purposes.
That decision isn't an indictment of Cassandra's capability; it's
confirmation that Cassandra isn't everything to everyone. But we already
knew that. :-)
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David Strauss
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Four
t;
> On Tue, Jul 6, 2010 at 3:34 AM, David Strauss <mailto:da...@fourkitchens.com>> wrote:
>
> On 2010-07-05 15:40, Eric Evans wrote:
> > On Sun, 2010-07-04 at 13:14 +0100, Bill de hÓra wrote:
> >> This person's understanding is that Fa
n 0.7 as a result of Digg's work), it
will be possible to support increment and decrement operations, just not
ones that give you an instant, unique result. The actual inc and dec
support probably won't be in 0.7, though.
> "Also sorting happens on insert time"
&
ead on the status of the evolving
non-relational space.
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David Strauss
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e interesting responses from this list if you share the
original problem you're trying to solve instead of asking us how to
implement a component of your chosen solution.
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David Strauss
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g from Cassandra. You could even use
memcached to maintain the counters. You'd have to be careful to avoid
re-using values on memcached restart or clearing, but there are many
ways to do that.
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David Strauss
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r a site like Digg, immediate consistency just isn't
that important.
(2) Treat one direction as the canonical source. When reading from the
other direction, verify that each item exists in the other direction.
(3) Add locking above Cassandra, using a system like ZooKeeper.
(4) Don't use C
are very nice LDAP systems
available that support multi-master replication and are commonly used as
key stores. Also, I imagine reads are more important than writes for
you, and LDAP tools tend to be optimized for reads.
--
David Strauss
| da...@fourkitchens.com
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t;> To: user@cassandra.apache.org
>> Subject: Write times
>>
>> Are writes on OrderPreservingPartitioner always slower than
>> RandomPartitioner? Is the replication factor a 'factor' in the write times?
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David Strauss
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ver, I was testing
with many threads making many small requests (under 10 columns each).
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original set) on a designated street corner.
You'd want to pick the bucket option -- despite the higher volume -- and
your hard disk would agree.
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David Strauss
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enerated
> with thrift compiler
The generated Thrift client automatically makes use of the PHP
extension, if available, for certain small, computationally intense
portions of the code. You have to use TBinaryProtocolAccelerated for
this to work.
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David Strauss
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write to for any row in either DC without need for
hinted hand-off. Writes should then succeed if you use SL.ONE, even with
a disconnect between DCs.
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David Strauss
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Or, if faking memcached misses is too high a price to pay, queue some
proportion of the reads to replay asynchronously against Cassandra.
On Wed, 2010-03-31 at 11:04 -0500, Jonathan Ellis wrote:
> Can you redirect some of the reads from memcache to cassandra? Sounds
> like the cache isn't getting
key/row, and
column?
> When user's mark changes, we remove old mark_userId and add new
> mark_userId.
> Because user's mark change frequently and with large amount of user, I
> think Cassandra can not satisfy.
On the contrary, Cassandra excels at tracking rapidly cha
hich are the basis of counters.
There is a difference between Cassandra allowing inc/dec on values and
actually *knowing* the resultant value at the time of the write. It's
likely that inc/dec support will still feature blind writes if at all
possible. The memcached protocol returns a resultant val
On 2010-04-05 07:47, Paul Prescod wrote:
> On Mon, Apr 5, 2010 at 12:01 AM, David Strauss wrote:
>> On 2010-04-05 03:42, Paul Prescod wrote:
>> ...
>>
>> There is a difference between Cassandra allowing inc/dec on values and
>> actually *knowing* the resultant val
//row key
> mark_userId: ""// (column name : value),
> mark2_userId2: ""
> },
> gameId2:{//row key
> mark_userId: ""
> }
> }
>
>
> On Sun, Apr 4, 2010 at 11:44 PM, David Strauss <mailto:da...@fourkitch
(a python lib of cassandra)
>>
>> import pycassa
>> client = pycassa.connect()
>> cf = pycassa.ColumnFamily(client, 'mygame', 'user')
>>
>> key = '1234567890'
>> value = {
>> 'name': 'Lee Li',
>>
>> 'age'; '21',
>> 'girls': ['java', 'actionscript', 'python'],
>> }
>>
>> cf.insert(key, value)
>>
>>
>> Oops, get error while save a `value` like above.
>>
>> So, how to store list data in Apache Cassndra ?
>>
>>
>> Thanks for reply.
>>
>>
>>
>>
>> --
>> Shuge Lee | Lee Li
>>
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iscover them. Cold comfort, imo.
Is it possible to iterate through RP keys? I've gotten mixed answers.
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I think the general answer here is don't use R=1 if you can't
> tolerate
> inconsistency? Still the point of confusion -- if W=3 and the write
> succeeds on 2 nodes but fails the 3rd, the write fails (to the
> updating client), but is the
r. I just want the ability to
walk all rows and prune stuff.
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David Strauss
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