I am not sure if this is the right thread to ask about this.
I read that some people are using cage+zookeeper. I was wondering if anyone
evaluates https://github.com/Netflix/curator? this seems to be a versatile
package.
On Tue, Dec 13, 2011 at 6:06 AM, John Laban wrote:
> Ok, great. I'll be s
Hello,
Congratulations on your work on libcassandra & libcassie.
I agree with you that too many abstractions are not a good thing, that's
why I think thrift & glib are a much better way to go than thrift & cpp
& libcassandra & libcassie.
I as well am looking for a very basic Thrift & glibc ex
Hi,
I am running a performance test for Cassandra 1.0.5. It can perform about 1500
business operation (one read+one write to the same row) per second. However,
the CPU is still 85% idle (as shown by vmstat) and the IO utilization is less
than a few percent (as shown by iostat). "nodetool tpstat
Hi,
I have a couple of questions about working with Ruby on Rails and Cassandra.
What is the recommended way of Cassandra integration into a Rails app ?
active_column
cassandra-cql
some other gems?
Is there any reference implementation?
some projects on github that are using the gems?
Use parallel test:-)))
2011/12/15 Kent Tong
> Hi,
>
> I am running a performance test for Cassandra 1.0.5. It can perform about
> 1500 business operation (one read+one write to the same row) per second.
> However, the CPU is still 85% idle (as shown by vmstat) and the IO
> utilization is less th
The more physical data that lives on a node the more intensive operations
are. Especially read based ops.
Even if your ring is balanced something like a failed repair could create a
data imbalance.
>From some offline talks with you I know you node count is on smaller end
and repairs have been pro
Btw anyone having problems with repair might like to follow proposal for
different system:
https://issues.apache.org/jira/browse/CASSANDRA-3620
With this system you would only need to run repair to ensure all data has
maximum redundancy across the cluster (which also increases consistency for
Cons
Hi,
I have one question about OpsCeneter: does it have to be running all the time
in order to collect and store the metrics on each node within the cluster? Who
does the job to write metrics on each node, the agent on the node or OpsCenter?
Thanks,
Mike
This email was sent to you by Thomson Re
Cassandra 1.0.6 under Windows Server 2008 R2 64bit with disk acces mode
mmap_index_only failing to delete any *-Index.db files after compaction or
scrub:
ERROR 13:43:17,490 Fatal exception in thread Thread[NonPeriodicTasks:1,5,main]
java.lang.RuntimeException: java.io.IOException: Failed to dele
I'm not sure this is the best answer, but all of our webapps (RoR included)
access Cassandra via REST.
That is one of the major reasons we built Virgil.
http://code.google.com/a/apache-extras.org/p/virgil/
It allows us to build the webapps, for the most part, independent of the
actual storage mec
The OpsCenter agents report metric data to the main OpsCenter process
which processes it and writes data into the cluster. So yes, the main
OpsCenter process needs to be running in order for metrics to be
stored in the cluster.
-Nick
On Thu, Dec 15, 2011 at 9:43 AM, wrote:
> Hi,
>
>
>
> I have
May I suggest dstat, does cpu, memory, and io on one console
dstat -vn 3
So possible causes
* Not sufficient parrallelism in the client
* Server has too few threads
* You are not CPU bound, network or disk may be the bottleneck
p
- Original Message -
From: Kent Tong
To: "user@cassa
Thank Nick for your fast response.
So if the OpsCenter is down, then the stats for the cluster won't be collected.
Is there any safe-guard mechanism, like a duplicate OpsCenter on second machine
to monitor the cluster in case of single OpsCenter failure?
Mike
-Original Message-
From:
No, currently there is not failover mechanism built into OpsCenter.
The agents could be reconfigured to talk to a different machine but
this would be a manual process and involve additional configuration
changes.
On Thu, Dec 15, 2011 at 12:13 PM, wrote:
> Thank Nick for your fast response.
>
> S
Hello,
While digging more for this I've found these :
http://svn.apache.org/viewvc/thrift/lib/c_glib/test/
Which shows how to create the TSocket and TTransport structures, very similar
to the way it's done in C++.
Now I'm stuck on how to create the actual connection to the Cassandra server.
I
Got it, Nick. Thanks again. :-)
-Original Message-
From: Nick Bailey [mailto:n...@datastax.com]
Sent: Thursday, December 15, 2011 12:18 PM
To: user@cassandra.apache.org
Subject: Re: Does OpsCenter have to be running all the time in order to collect
the cluster stats?
No, currently there
I'm actually using Curator as a Zookeeper client myself. I haven't used it
in production yet, but so far it seems well written and Jordan Zimmerman at
Netflix has been great on the support end as well.
I haven't tried Cages so I can't really compare, but I think one of the
main deciding factors b
So in our cluster of 10 nodes we have 2 bad nodes that are in disagreement
with the others. On one of the two bad nodes I tried to move the Schema*
and Migration* files out of the system data directory as is listed in the
http://wiki.apache.org/cassandra/FAQ#schema_disagreement FAQ . When the
no
Hi All,
I saw the following log message today on a node running cassandra 1.0.5:
"WARN [pool-1-thread-1] 2011-12-15 20:28:53,915 Memtable.java (line 174)
setting live ratio to maximum of 64 instead of Infinity"
I guess this means calculated throughput is either very low or the Memtable is
huge
So I was able to get the schema agreeing on the two bad nodes, but I don't
particularly like the way that I did it. One at a time, I shut them down,
removed Schema* and Migration*, then copied over Schema* from another
working node. They then started up with the correct schema. Did I do
somethin
Dear all,
Thanks for the good suggestions! I believe it is because the test client is
single-threaded, so only server thread is serving it, so the rest of the cores
are just sitting idle.
Thanks!
--
Author of books for learning CXF, Axis2, Wicket, JSF
(http://www.agileskills2.org)
Probably quite a few of them are coming from automatic retries by
phpcassa. When working with counters, I recommend minimizing retries
and/or increasing timeouts. Usually this means you want to use a separate
connection pool with different settings just for counters.
By the way, this advice appl
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