On 05/18/2012 08:49 AM, Viktor Jevdokimov wrote:
Row cache is ok until keys are not heavily
updated, otherwise it frequently invalidates and pressures
GC.
According to http://www.datastax.com/docs/1.0/operat
Hi
I have setup an Cassandra cluster in production and a separate cluster in
our DR environment. The setup is basically 2 data center setup.
I want to create a separate keyspace on production (production has some
other keyspaces) and only that keyspace will sync the data with DR.
If I do a read
Row cache is ok until keys are not heavily updated, otherwise it frequently
invalidates and pressures GC.
The high latency is from your batch of 100 keys. Review your data model to
avoid such reads, if you need low latency.
500M rows on one node, or on the cluster? Reading 100 random rows at to
I would rather set the Keyspace setting min_compaction_threshold
and max_compaction_threshold to be a higher number and once i am ready i
will put the value back... This way i dont need to restart.
Having said that why not set the compaction throughput to 1 (low enough to
not have contention) and c
On 05/17/2012 09:49 PM, casablinca126.com wrote:
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Hi
We use amazon ami 3.2.12-3.2.4.amzn1.x86_64
and some of our data file are more than 10G
thanks
koji
2012-5-16 下午6:00 於 "aaron morton" 寫道：
> On Ubuntu ? Sounds like http://wiki.apache.org/cassandra/FAQ#ubuntu_hangs
>
> Cheers
>
>
> -
> Aaron Morton
> Freelance Developer
> @a
Pieter, Aaron,
Any further progress on this? I'm running into the same issue, although in
my case I'm trying to stream from Ubuntu 10.10 to a 2-node cluster (also
Cassandra 1.1.0, and running on separate Ubuntu 10.10 hosts).
Thanks in advance!
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No cache can only have data from the local node since write operations
need to be able to evict items.
On Thu, May 17, 2012 at 4:42 PM, Maxim Potekhin wrote:
> Hello,
>
> when I chose to have a rowcache -- will it contain data that is owned by
> other nodes?
>
> Thanks
>
> Maxim
>
Hello,
when I chose to have a rowcache -- will it contain data that is owned by
other nodes?
Thanks
Maxim
>>
>> Does the updated reporting in 1.1.0 include the replicated data and before
>> it didn't?
>
> Yes.
>
Thanks for verifying that.
Ron
Its our test machine with one node in cluster:-)
2012/5/17 Jeremy Hanna :
> when doing a truncate, it has to talk to all of the nodes in the ring to
> perform the operation. by the error, it looks like one of the nodes was
> unreachable for some reason. you might do a nodetool ring in the cli
Hi Aaron,
Thank you for guiding us by breaking down the issue. Please see my answers
embedded
> Is this a single client ?
Yes
> How many columns is it asking for ?
the client knows a list of all row keys, and it randomly picks 100, and
loops 100 times. It first reads a metadata column to fig
Hi,
I am trying to connect to a Cassandra (1.0.8 or 1.1.0) server with the
standard Thrift/CQL client, over an SSH tunnel, but keep getting this
exception:
org.apache.thrift.transport.TTransportException:
java.net.SocketException: Connection reset by peer: socket write error
The CQL query itself
Thanks Viktor for the advice.
Right now, i just have 1 node that i am testing against and i am using CL
one.
Are you suggesting that the page cache might be doing better than the row
cache?
I am getting row cache hit of 0.66 right now.
/G
On Thu, May 17, 2012 at 12:26 AM, Viktor Jevdokimov <
vikt
On Thu, May 17, 2012 at 8:55 AM, jason kowalewski
wrote:
> We have been attempting to change our data model to provide more
> performance in our cluster.
>
> Currently there are a couple ways to model the data and i was
> wondering if some people out there could help us out.
>
> We are storing tim
I think the topic is very interesting :)
I can't attend the SF event (as I am in Israel) and will appreciate a video!
Thanks,
*Tamar Fraenkel *
Senior Software Engineer, TOK Media
[image: Inline image 1]
ta...@tok-media.com
Tel: +972 2 6409736
Mob: +972 54 8356490
Fax: +972 2 5612956
On
Although, probably inappropriate, I would be willing to contribute some
funds for someone to recreate it with animated stick-figures.
thanks. ;)
On Thu, May 17, 2012 at 6:02 PM, Jeremy Hanna wrote:
> Sorry - it was at the austin cassandra meetup and we didn't record the
> presentation. I wonder
All,
A year ago I made a simple query to see if there were any users based in
and around Zurich, Switzerland or the Alps region, interested in
participating in some form of Cassandra User Group / Meetup. At the time,
1-2 replies happened. I didn't do much with that.
Let's try this again. Who a
Sorry - it was at the austin cassandra meetup and we didn't record the
presentation. I wonder if this would be a popular topic to have at the
upcoming Cassandra SF event which would be recorded...
On May 17, 2012, at 6:51 AM, Tamar Fraenkel wrote:
> Hi!
>
> I found the slides of the lecture
when doing a truncate, it has to talk to all of the nodes in the ring to
perform the operation. by the error, it looks like one of the nodes was
unreachable for some reason. you might do a nodetool ring in the cli do a
'describe cluster;' and see if your ring is okay.
So I think the operation
On Wed, May 16, 2012 at 5:08 PM, Ron Siemens wrote:
>
> I upgraded to 1.0.6 to 1.1.0, and I noticed the effective ownership report
> changed.
>
> I have a 3-node cluster, with evenly divided tokens and RF=2. The node tool
> report on 1.0.6 was:
>
> 33.33% 0
> 33.33% 56713727820156410577229101
Maybe, something changes in cassandra 1.0.x for truncate mechanism,
because in cassandra 0.8 truncate executes much faster on the same
data
2012/5/17 Viktor Jevdokimov :
> Truncate flushes all memtables to free up commit logs, and that on all nodes.
> So this takes time. Discussed on this list no
Hi!
I found the slides of the lecture
http://www.slideshare.net/mattdennis/cassandra-on-ec2
I wonder if there is a way to get a video of the lecture.
Thanks,
*Tamar Fraenkel *
Senior Software Engineer, TOK Media
[image: Inline image 1]
ta...@tok-media.com
Tel: +972 2 6409736
Mob: +972 54 835
Truncate flushes all memtables to free up commit logs, and that on all nodes.
So this takes time. Discussed on this list not so long ago.
Watch for:
https://issues.apache.org/jira/browse/CASSANDRA-3651
https://issues.apache.org/jira/browse/CASSANDRA-4006
Best regards / Pagarbiai
Viktor Jevdok
Also i miss understand why on empty CF(no any SStable) truncate heavy
loads disk??
2012/5/17 ruslan usifov :
> Hello
>
> I have follow situation on our test server:
>
> from cassandra-cli i try to use
>
> truncate purchase_history;
>
> 3 times i got:
>
> [default@township_6waves] truncate purchase
Hello
I have follow situation on our test server:
from cassandra-cli i try to use
truncate purchase_history;
3 times i got:
[default@township_6waves] truncate purchase_history;
null
UnavailableException()
at
org.apache.cassandra.thrift.Cassandra$truncate_result.read(Cassandra.java:202
On Thu, May 17, 2012 at 2:14 AM, Rob Coli wrote:
> On Tue, Apr 24, 2012 at 12:56 PM, Matthias Pfau wrote:
>> we just noticed that cassandra is currently published with inconsistent
>> dependencies. The inconsistencies exist between the published pom and the
>> published distribution (tar.gz). I c
> Gurpreet Singh wrote:
> Any ideas on what could help here bring down the read latency even more ?
Avoid Cassandra forwarding request to other nodes:
- Use consistency level ONE;
- Create data model to do single request with single key, since different keys
may belong to different nodes and requ
zCassandra data model is best known for demoralize data. You must have
entry for column name in other column family.
Example is just for posterity, you should not put everything in single row,
very inefficient.
I do not use composite column. The way I do and others do is use complex
column.
rowk
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