> Potential sources of simultaneous disk write :
>
> - Memtable flushing
> - SSTable compaction/anticompaction
> - SSTable streaming
> - Commitlog writes (which should be on a different drive from data per
> best practices anyway..)
Honestly though, last time I measured the effects of multiple
str
On 02/03/2011 17:57, David McNelis wrote:
In case anyone is interested. Our problem revolved around one machine
having the phpcassa thrift patch, and the other did not. Its resolved
now.
Which patch?
I think there is a difference between tag v0.7.a.3 and the current HEAD
of master. I
rt
--
Donal Zang
unresponsive... : )
2011/3/3 Donal Zang :
> rt
>
> --
> Donal Zang
Hi,
Probably I got the answer, it is Tombstones in Cassandra.
It is something like soft delete..
Pl correct me if m wrong
Regards
sagar
-Original Message-
From: Sagar Kohli [mailto:sagar.ko...@impetus.co.in]
Sent: Thursday, March 03, 2011 11:44 AM
To: user@cassandra.apache.org
Subject: R
Before a keyspace is dropped, a snapshot is taken (by security). It is your
job to remove the snapshot manually.
(the tombstones have no play here)
--
Sylvain
On Thu, Mar 3, 2011 at 12:36 PM, Sagar Kohli wrote:
> Hi,
>
> Probably I got the answer, it is Tombstones in Cassandra.
> It is somethin
Thanks Salvain to correct me, Have one more query, what is the
location(default) of snapshot created by security??
~sagar
From: Sylvain Lebresne [mailto:sylv...@datastax.com]
Sent: Thursday, March 03, 2011 5:22 PM
To: user@cassandra.apache.org
Cc: Sagar Kohli
Subject: Re: dropping keyspace in ca
On Thu, Mar 3, 2011 at 1:01 PM, Sagar Kohli wrote:
> Thanks Salvain to correct me, Have one more query, what is the
> location(default) of snapshot created by security??
>
That should be within your data directory, in a directory whose name is the
current time of the snapshot (aka drop in this c
If you edit the $CASSANDRA_HOME/conf/cassandra-env.sh script, you should be
able to set up ssl for the JMX connection. That should allow you to do a
direct connection from a locally running JConsole to the JMX port on the
public IP of your EC2 instance.
On Wed, Mar 2, 2011 at 9:10 PM, Sameer Faroo
Ok seems that i'll use Solr (with dedicated Cassandra) for search
I've readed this article :
http://ria101.wordpress.com/2010/02/22/cassandra-randompartitioner-vs-orderpreservingpartitioner/on
RP vs OPP...
Here is my case
docs_shared{ //docs shared by users ordered by time
'time:id_user:id
Ok seems that i'll use Solr (with dedicated Cassandra) for search
I've readed this article :
http://ria101.wordpress.com/2010/02/22/cassandra-randompartitioner-vs-orderpreservingpartitioner/
on
RP vs OPP...
Here is my case
docs_shared{ //docs shared by users ordered by time
'time:id_user:i
Have you considered using Solandra (Solr/Lucene + Cassandra) -
https://github.com/tjake/Lucandra#readme ? There is a #solandra channel on
freenode if you had any questions as well.
On Mar 3, 2011, at 8:00 AM, Vodnok wrote:
> Ok seems that i'll use Solr (with dedicated Cassandra) for search
>
We found this was very helpful:
http://simplygenius.com/2010/08/jconsole-via-socks-ssh-tunnel.html
(http://wiki.apache.org/cassandra/Operations#Monitoring)
- fduan
On Wed, Mar 2, 2011 at 9:10 PM, Sameer Farooqui wrote:
> I want to use JConsole to look at the Cassandra's MBean's attributes (like
In PropertyFileSnitch is cassandra-rack.properties or
cassandra-topology.properties file used ?
Little confused by the stmt:
PropertyFileSnitch determines the location of nodes by referring to a
user-defined description of the network details located in the
property file cassandra-rack.properties.
Whenever I do failure testing I see this error message and then cassandra
process exits. This is what I am doing:
1. 3 node cluster. CF of RF=3, W=QUORUM and R=QUORUM
2. Execute client code in a loop which just reads data from CF in while
loop.
2. Bring one node down (Node C). Everything ok. C
Dave
We are in production with 0.6. We started with this and haven't had time to
figure out how to upgrade smoothly. It's on the horizon though; there's
loads of features we really could do with in 0.7.
In terms of strategy, we don't currently follow Tyler's suggestions. I can't
see any reason wh
Hello,
In our project our usage pattern is likely to be quite variable -- high for a a
few days, then lower, etc could vary as much (or more) as 10x from peak to
"non-peak". Also, much of our data is immutable -- but there is a considerable
amount of it -- perhaps in the single digit TBs. Final
Did you try "ls conf/" ?
On Thu, Mar 3, 2011 at 11:27 AM, A J wrote:
> In PropertyFileSnitch is cassandra-rack.properties or
> cassandra-topology.properties file used ?
>
> Little confused by the stmt:
> PropertyFileSnitch determines the location of nodes by referring to a
> user-defined descript
Yes, that has topology and not rack.
conf/access.properties conf/log4j-server.properties
conf/cassandra-env.sh conf/log4j-tools.properties
conf/cassandra-topology.properties conf/passwd.properties
conf/cassandra.yaml conf/README.txt
On Thu, Mar 3, 2011
I am unable to enable/disable HH via JMX (JConsole).
Even though the load is on and read/writes happening, I don't see
"operations" component on Jconsole. To clarify further, I see only
Jconsole->MBeans->org.apache.cassandra.db.StorageProxy.Attributes. I don't
see Jconsole->MBeans->org.apache.cass
The HintedHandoffEnabled attribute is read/write.
You can always set it to true/false to enable/disable HH.
Regards,
Chen
www.evidentosftware.com
On Thu, Mar 3, 2011 at 1:47 PM, Narendra Sharma
wrote:
> I am unable to enable/disable HH via JMX (JConsole).
>
> Even though the load is on and re
Has anyone heard about lustre distributed file system? I am wondering if it
will work well where keep the metadata in Cassandra and images in Lustre.
I looked at MogileFS but not too sure about it's support.
--
View this message in context:
http://cassandra-user-incubator-apache-org.3065146.n2.n
using latest cassandra (0.7.2). I want to try out Network Topology Strategy.
Following is related setting in cassandra.yaml
endpoint_snitch: org.apache.cassandra.locator.PropertyFileSnitch
I have four nodes. Set them accordingly in ./conf/cassandra-topology.properties:
10.252.219.224=DC2:RAC1
10.
How Amazon implemented its S3? Seems to me that you are going to implement
something like S3 - data storage system. I have the same requirement - need to
store hugh amount of large files (pdf, image, zip, video, audio...).
Another question: how about HDFS?
-Original Message-
From: mcasa
On Thu, Mar 3, 2011 at 2:49 PM, mcasandra wrote:
> Has anyone heard about lustre distributed file system? I am wondering if it
> will work well where keep the metadata in Cassandra and images in Lustre.
>
> I looked at MogileFS but not too sure about it's support.
>
> --
> View this message in con
why would you keep metadata in cassandra ? Even for millions of
documents, metadata would be very small, mysql/postgres should
suffice.
Luster ofcourse is well known and widely used along with glusterfs.
Luster I think requires kernel modifications and will be much more
complex. Also it is easier
Did somebody try -XX:+UseCompressedStrings with cassandra? Sounds very
promising and reasonable.
you need to specify per-DC replicas w/ NTS in strategy_options,
instead of using replication_factor
On Thu, Mar 3, 2011 at 1:52 PM, A J wrote:
> using latest cassandra (0.7.2). I want to try out Network Topology Strategy.
>
> Following is related setting in cassandra.yaml
> endpoint_snitch: org.a
Well it's not just metadata that I need to store but also Username, profiles,
followers etc. What I meant was store the location of the images along with
other information that I described above. And when user queries them then
pull it from the file sytem.
Most of the high volume sites (facebook,
It's still maintained: https://github.com/mogilefs/ . I don't have a good
sense of the community, though we did use it at my last job.
On Thu, Mar 3, 2011 at 3:44 PM, mcasandra wrote:
> Well it's not just metadata that I need to store but also Username,
> profiles,
> followers etc. What I meant
On Thu, Mar 3, 2011 at 1:02 PM, Dan Kuebrich wrote:
> It's still maintained: https://github.com/mogilefs/ . I don't have a good
> sense of the community, though we did use it at my last job.
#mogilefs on freenode contains one of the most solicitous and helpful
project maintainers I have ever hav
Thanks.
It worked when I changed as you suggested to: create keyspace ks1 with
strategy_options = [{DC1:1, DC2:1}] and
placement_strategy='org.apache.cassandra.locator.NetworkTopologyStrategy';
Something that I am observing:
The replicas are always put in the first node on the other DC. (So if
the
Sounds like your nodes are not evenly spaced around the ring in each dc.
On Thu, Mar 3, 2011 at 4:09 PM, A J wrote:
> Thanks.
> It worked when I changed as you suggested to: create keyspace ks1 with
> strategy_options = [{DC1:1, DC2:1}] and
> placement_strategy='org.apache.cassandra.locator.Netwo
On Thu, Mar 3, 2011 at 3:21 PM, Timo Nentwig wrote:
> Did somebody try -XX:+UseCompressedStrings with cassandra? Sounds very
> promising and reasonable.
Would be nice except in 0.7.0 we are using mostly byte buffers now.
Although the column family name is still a String.
To some extent, the boot-strapping problem will be an issue with most
solutions: the data has to be duplicated from somewhere. Bootstrapping
should not cause much performance degradation unless you are already pushing
capacity limits. It's the decommissioning problem which makes Cassandra
somewhat
35 matches
Mail list logo
