The answer to this questions is very much dependent on the throughput,
desired latency and access patters (R/W or R/O)? In general what I have
seen working for high throughput environment is to either use a distributed
file system like Ceph/Gluster or object store like S3 and keep the pointer
in
Some other ways to track old records is:
1) Use external queues - One queue per week or month for instance and pile
up data on the queue cluster
2) Create one more table in C* to track the keys per week or month that you
can scan to read the keys of the audit table. Make sure you delete the
For large volume big data scenarios we don't recommend using Cassandra as a
blob storage simply because of intensive IO involved during compation,
repair etc. Cassandra store is only well suited for metadata type storage.
However, if you are fairly low volume then it's a different story, but if
+1
I like hector client that uses thrift interface and exposes APIs that is
similar to how Cassandra physically stores the values.
On Thu, Feb 20, 2014 at 9:26 AM, Peter Lin wool...@gmail.com wrote:
I disagree with the sentiment that thrift is not worth the trouble.
CQL and all SQL inspired
On Thu, Feb 20, 2014 at 4:37 PM, Edward Capriolo edlinuxg...@gmail.comwrote:
Recomendations in cassandra have a shelf life of about 1 to 2 years. If
you try to assert a recomendation from year ago you stand a solid chance of
someone telling you there is now a better way.
Casaandra once loved
In our testing USB tends to be slower. If there is something more integrated
internally would give you better performance
Sent from my iPhone
On Nov 16, 2013, at 8:30 AM, Dan Simpson dan.simp...@gmail.com wrote:
It doesn't seem like a great idea. The USB drives typically use dynamic wear
Post your gc logs
Sent from my iPhone
On Nov 3, 2013, at 6:54 AM, Oleg Dulin oleg.du...@gmail.com wrote:
Cass 1.1.11 ran out of memory on me with this exception (see below).
My parameters are 8gig heap, new gen is 1200M.
ERROR [ReadStage:55887] 2013-11-02 23:35:18,419
is 1.0.11, we are migrating to 1.2.X
though. We had tuned bloom filters (0.1) and AFAIK making it lower than
this won't matter.
Thanks !
On Tue, Oct 1, 2013 at 11:54 PM, Mohit Anchlia mohitanch...@gmail.comwrote:
Which Cassandra version are you on? Essentially heap size is function of
number
Which Cassandra version are you on? Essentially heap size is function of
number of keys/metadata. In Cassandra 1.2 lot of the metadata like bloom
filters were moved off heap.
On Tue, Oct 1, 2013 at 9:34 PM, srmore comom...@gmail.com wrote:
Does anyone know what would roughly be the heap size
Your ParNew size is way too small. Generally 4GB ParNew (-Xmn) works out
best for 16GB heap
On Mon, Sep 23, 2013 at 9:05 PM, 谢良 xieli...@xiaomi.com wrote:
it looks to me that MaxTenuringThreshold is too small, do you have any
chance to try with a bigger one, like 4 or 8 or sth else?
of nodetool ring here.
On Thu, Sep 19, 2013 at 8:35 PM, Mohit Anchlia mohitanch...@gmail.comwrote:
Other thing I noticed is that you are using mutiple RACKS and that might
be contributing factor to it. However, I am not sure.
Can you paste the output of nodetool cfstats and ring? Is it possible
Did you start out your cluster after wiping all the sstables and commit
logs?
On Fri, Sep 20, 2013 at 3:42 PM, Suruchi Deodhar
suruchi.deod...@generalsentiment.com wrote:
We have been trying to resolve this issue to find a stable configuration
that can give us a balanced cluster with equally
Can you check cfstats to see number of keys per node?
On Thu, Sep 19, 2013 at 12:36 PM, Suruchi Deodhar
suruchi.deod...@generalsentiment.com wrote:
Thanks for your replies. I wiped out my data from the cluster and also
cleared the commitlog before restarting it with num_tokens=256. I then
.
Thanks,
Suruchi
On Thu, Sep 19, 2013 at 3:59 PM, Mohit Anchlia mohitanch...@gmail.comwrote:
Can you check cfstats to see number of keys per node?
On Thu, Sep 19, 2013 at 12:36 PM, Suruchi Deodhar
suruchi.deod...@generalsentiment.com wrote:
Thanks for your replies. I wiped out my data
at 5:18 PM, Mohit Anchlia mohitanch...@gmail.comwrote:
Can you run nodetool repair on all the nodes first and look at the keys?
On Thu, Sep 19, 2013 at 1:22 PM, Suruchi Deodhar
suruchi.deod...@generalsentiment.com wrote:
Yes, the key distribution does vary across the nodes. For example
I agree. We've had similar experience.
Sent from my iPhone
On Sep 7, 2013, at 6:05 PM, Edward Capriolo edlinuxg...@gmail.com wrote:
I have found row cache to be more trouble then bene.
The term fools gold comes to mind.
Using key cache and leaving more free main memory seems stable and
Are you not using RF = 3 ?
On Fri, Sep 6, 2013 at 10:14 AM, Thapar, Vishal (HP Networking)
vtha...@hp.com wrote:
My usage requirements are such that there should be least possible data
loss even in case of a poweroff. When you say clean shutdown do you mean
Cassandra service stop?
I ran
In general with LOCAL_QUORUM you should not see such an issue when one node
is slow. However, it could be because Client's are still sending requests
to that node. Depending on what client library you are using , you could
try to take that node out of your connection pool. Not knowing exact issue
If you have multiple DCs you at least want to upgrade to 1.0.11. There is
an issue where you might get errors during cross DC replication.
On Fri, Aug 30, 2013 at 9:41 AM, Mike Neir m...@liquidweb.com wrote:
In my testing, mixing 1.0.9 and 1.2.8 seems to work fine as long as there
is no need
You need to get it to 50% on each to equally distribute the has range. You
need to 1) Calculate new token 2) move nodes to that token or use vnodes
For the first option see:
http://www.datastax.com/docs/0.8/install/cluster_init
On Mon, Aug 12, 2013 at 12:06 PM, Morgan Segalis
But node might be streaming data as well, in that case only option is to
restart node that started streaming operation
Sent from my iPhone
On Aug 8, 2013, at 5:56 PM, Andrey Ilinykh ailin...@gmail.com wrote:
nodetool repair just triggers repair procedure. You can kill nodetool after
start,
What's your replication factor? Can you check tp stats and net stats to see if
you are getting more mutations on these nodes ?
Sent from my iPhone
On Jul 16, 2013, at 3:18 PM, Jure Koren jure.ko...@zemanta.com wrote:
Hi C* user list,
I have a curious recurring problem with Cassandra 1.2
There is a new tracing feature in Cassandra 1.2 that might help you with
this.
On Tue, Jul 9, 2013 at 1:31 PM, Blair Zajac bl...@orcaware.com wrote:
No idea on the logging, I'm pretty new to Cassandra.
Regards,
Blair
On Jul 9, 2013, at 12:50 PM, hajjat haj...@purdue.edu wrote:
Blair,
of 4GB).
2013/6/19 Mohit Anchlia mohitanch...@gmail.com
How much data do you have per node?
How much RAM per node?
How much CPU per node?
What is the avg CPU and memory usage?
On Wed, Jun 19, 2013 at 12:16 AM, Joel Samuelsson
samuelsson.j...@gmail.com wrote:
My Cassandra ps info
How much data do you have per node?
How much RAM per node?
How much CPU per node?
What is the avg CPU and memory usage?
On Wed, Jun 19, 2013 at 12:16 AM, Joel Samuelsson samuelsson.j...@gmail.com
wrote:
My Cassandra ps info:
root 26791 1 0 07:14 ?00:00:00 /usr/bin/jsvc
Is your young generation size set to 4GB? Can you paste the output of ps
-ef|grep cassandra ?
On Tue, Jun 18, 2013 at 8:48 AM, Joel Samuelsson
samuelsson.j...@gmail.comwrote:
Yes, like I said, the only relevant output from that file was:
2013-06-17T08:11:22.300+: 2551.288: [GC
Can you paste you gc config? Also can you take a heap dump at 2 diff points so
that we can compare it?
Quick thing to do would be to do a histo live at 2 points and compare
Sent from my iPhone
On Jun 15, 2013, at 6:57 AM, Takenori Sato ts...@cloudian.com wrote:
INFO [ScheduledTasks:1]
Roughly how much data do you have per node?
Sent from my iPhone
On Feb 20, 2013, at 10:49 AM, Hiller, Dean dean.hil...@nrel.gov wrote:
I took this jmap dump of cassandra(in production). Before I restarted the
whole production cluster, I had some nodes running compaction and it looked
like
How can this be resolved in this case?
On Wed, Sep 12, 2012 at 3:53 PM, Rob Coli rc...@palominodb.com wrote:
On Tue, Sep 11, 2012 at 4:21 PM, Edward Sargisson
edward.sargis...@globalrelay.net wrote:
If the downed node is a seed node then neither of the replace a dead node
procedures work
Are both running on the same host?
On Fri, Sep 7, 2012 at 11:53 PM, Manu Zhang owenzhang1...@gmail.com wrote:
When I run Cassandra-trunk in Eclipse, nodetool fail to connect with the
following error
Failed to connect to '127.0.0.1:7199': Connection refused
But if I run in terminal, all will
As far as I know Cassandra doesn't use internal queueing mechanism specific
to replication. Cassandra sends the write the remote DC and after that it's
upto the tcp/ip stack to deal with buffering. If requests starts to timeout
Cassandra would use HH upto certain time. For longer outage you would
enough indicator of my back log?
Although we know when a network is flaky, we are interested in knowing how
much data is piling up in local DC that needs to be transferred.
Greatly appreciate your help.
VR
On Wed, Sep 5, 2012 at 8:33 PM, Mohit Anchlia mohitanch...@gmail.comwrote:
As far
: org.apache.cassandra.dht.RandomPartitioner
Schema versions:
9511e292-f1b6-3f78-b781-4c90aeb6b0f6: [10.20.8.4, 10.20.8.5,
10.20.8.1, 10.20.8.2, 10.20.8.3]
*From:* Mohit Anchlia [mailto:mohitanch...@gmail.com]
*Sent:* Friday, August 24, 2012 1:55 PM
*To:* user@cassandra.apache.org
for strategy_options I should be using the DC name
from properfy file snitch right? Ours is “Fisher” and “TierPoint” so
that’s what I used.
** **
*From:* Mohit Anchlia [mailto:mohitanch...@gmail.com]
*Sent:* Monday, August 27, 2012 1:21 PM
*To:* user@cassandra.apache.org
*Subject:* Re
use nodetool decommission and nodetool removetoken
On Sun, Aug 26, 2012 at 5:31 PM, Senthilvel Rangaswamy senthil...@gmail.com
wrote:
We have a cluster of 9 nodes in the ring. We would like SSD backed boxes.
But we may not need 9
nodes in that case. What is the best way to downscale the
If you are starting out new use composite column names/values or you could
also use JSON style doc as a column value.
On Fri, Aug 24, 2012 at 2:31 PM, Rob Coli rc...@palominodb.com wrote:
On Fri, Aug 24, 2012 at 4:33 AM, Amit Handa amithand...@gmail.com wrote:
kindly help in resolving the
Going through this page and it looks like indexes are stored locally
http://www.datastax.com/dev/blog/cassandra-with-solr-integration-details .
My question is what happens if one of the solr nodes crashes? Is the data
indexed again on those nodes?
Also, if RF 1 then is the same data being
I agree with Edward. We always develop our own stress tool that tests each
use case of interest. Every use case is different in certain ways that can
only be tested using custom stress tool.
On Fri, Aug 10, 2012 at 7:25 AM, Edward Capriolo edlinuxg...@gmail.comwrote:
There are many YCSB forks
On Mon, Jul 23, 2012 at 10:07 AM, Ertio Lew ertio...@gmail.com wrote:
My major concern is that is it too bad retrieving 300-500 rows (each for a
single column) in a single read query that I should store all these(around
a hundred million) columns in a single row?
You could create multiple
On Mon, Jul 23, 2012 at 10:53 AM, Ertio Lew ertio...@gmail.com wrote:
Actually these columns are 1 for each entity in my application I need to
query at any time columns for a list of 300-500 entities in one go.
Can you describe your situation with small example?
On Mon, Jul 23, 2012 at 11:00 AM, Ertio Lew ertio...@gmail.com wrote:
For each user in my application, I want to store a *value* that is queried
by using the userId. So there is going to be one column for each user
(userId as col Name *value* as col Value). Now I want to store these
columns
On Mon, Jul 23, 2012 at 11:16 AM, Ertio Lew ertio...@gmail.com wrote:
I want to read columns for a randomly selected list of userIds(completely
random). I fetch the data using userIds(which would be used as column names
in case of single row or as rowkeys incase of 1 row for each user) for a
Sent from my iPad
On Jun 28, 2012, at 8:45 AM, Christof Bornhoevd cbornho...@gmail.com wrote:
Hi,
we are using Cassandra v1.0.8 with Hector v1.0-5 and would like to move our
current system to an operational setting based on Amazon AWS. What are best
practices for addessing security
On Tue, Jun 26, 2012 at 7:52 AM, Karthik N karthik@gmail.com wrote:
My Cassandra ring spans two DCs. I use local quorum with replication
factor=3. I do a write in DC1 with local quorum. Data gets written to
multiple nodes in DC1. For the same write to propagate to DC2 only one
copy is
question. In general I don't think you
can selectively decide on HH. Besides HH should only be used when the
outage is in mts, for longer outages using HH would only create memory
pressure.
On Tuesday, June 26, 2012, Mohit Anchlia wrote:
On Tue, Jun 26, 2012 at 7:52 AM, Karthik N karthik
That's right. Create class that implements the required interface and then
drop that jar in lib directory and start the cluster.
On Mon, May 14, 2012 at 11:41 AM, Kirk True k...@mustardgrain.com wrote:
Disclaimer: I've never tried, but I'd imagine you can drop a JAR
containing the class(es)
Is it possible to update CF definition to use reversed type? If it's
possible then what happens to the old values, do they still remain ordered
in ascending order?
, Mohit Anchlia mohitanch...@gmail.com
wrote:
Is it possible to update CF definition to use reversed type? If it's
possible then what happens to the old values, do they still remain
ordered
in ascending order?
+1
On Tue, May 1, 2012 at 12:06 PM, Edward Capriolo edlinuxg...@gmail.comwrote:
Also there are some tickets in JIRA to impose a max sstable size and
some other related optimizations that I think got stuck behind levelDB
in coolness factor. Not every use case is good for leveled so adding
On Thu, Mar 29, 2012 at 10:08 PM, Markus Wiesenbacher | Codefreun.de
m...@codefreun.de wrote:
Hi,
yes you can insert data into cassandra with apollo, just try the demo
center: http://www.codefreun.de/apolloUI/
You can login by just press the login-button (autologin) and play around
with
with this API. I think,
searching for a specific key is the most efficient way to get to your data,
instead of paging through it.
**
I was referring to columns, if a row-key has more than 100 columns then
there is no way to look at columns that falls outside of it
**
*Von:* Mohit
for any
details on the upgrade path for these versions).
The incompatibility here is only between 1.1.0-beta1 and 1.1.0-beta2.
--
Sylvain
On Thu, Mar 29, 2012 at 2:50 AM, Mohit Anchlia mohitanch...@gmail.com
wrote:
We are currently using 1.0.0-2 version. Do we still need to migrate
Any updates?
On Thu, Mar 29, 2012 at 7:31 AM, Mohit Anchlia mohitanch...@gmail.comwrote:
This is from NEWS.txt. So my question is if we are on 1.0.0-2 release do
we still need to upgrade since this impacts releases between 1.0.3-1.0.5?
-
If you are running a multi datacenter setup, you
does not generate cross-dc forwarding message at all, so you're
safe on that side.
Is cross-dc forwarding different than replication?
--
Sylvain
On Thu, Mar 29, 2012 at 9:33 PM, Mohit Anchlia mohitanch...@gmail.com
wrote:
Any updates?
On Thu, Mar 29, 2012 at 7:31 AM, Mohit Anchlia
We are currently using 1.0.0-2 version. Do we still need to migrate to the
latest release of 1.0 before migrating to 1.1? Looks like incompatibility
is only between 1.0.3-1.0.8.
On Tue, Mar 27, 2012 at 6:42 AM, Benoit Perroud ben...@noisette.ch wrote:
Thanks for the quick feedback.
I will
, at 6:21 AM, Mohit Anchlia wrote:
Thanks but if I do have to specify start and end columns then how much
overhead roughly would that translate to since reading metadata should be
constant overall?
On Mon, Mar 26, 2012 at 10:18 AM, aaron morton aa...@thelastpickle.comwrote:
Some information
On Sun, Feb 26, 2012 at 12:18 PM, aaron morton aa...@thelastpickle.comwrote:
Nathan Milford has a post about taking a node down
http://blog.milford.io/2011/11/rolling-upgrades-for-cassandra/
The only thing I would do differently would be turn off thrift first.
Cheers
Isn't decomission
In my opinion if you are busy site or application keep blobs out of the
database.
On Wed, Feb 22, 2012 at 9:37 AM, Dan Retzlaff dretzl...@gmail.com wrote:
Chunking is a good idea, but you'll have to do it yourself. A few of the
columns in our application got quite large (maybe ~150MB) and the
Outside on the file system and a pointer to it in C*
On Wed, Feb 22, 2012 at 10:03 AM, Rafael Almeida almeida...@yahoo.comwrote:
Keep them where?
--
*From:* Mohit Anchlia mohitanch...@gmail.com
*To:* user@cassandra.apache.org
*Cc:* potek...@bnl.gov
*Sent
PM, Mohit Anchlia wrote:
Outside on the file system and a pointer to it in C*
On Wed, Feb 22, 2012 at 10:03 AM, Rafael Almeida almeida...@yahoo.comwrote:
Keep them where?
--
*From:* Mohit Anchlia mohitanch...@gmail.com
*To:* user@cassandra.apache.org
*Cc
Does it work with iptables disabled?
You could add log to your firewall rules to see if firewall is
dropping the packets.
On Sun, Feb 5, 2012 at 5:35 PM, Roshan codeva...@gmail.com wrote:
Hi
I have 2 node Cassandra cluster and each linux box configured with a
firewall. The ports 7000, 7199
and ERROR. But if there is nothing to do then it
probably is just an INFO.
On Tue, Jan 31, 2012 at 9:41 PM, Mohit Anchlia mohitanch...@gmail.com wrote:
I guess this is not really a WARN in that case.
On Tue, Jan 31, 2012 at 4:29 PM, aaron morton aa...@thelastpickle.com
wrote:
The ratio
write to and then read from.
On Fri, Feb 3, 2012 at 10:31 AM, Mohit Anchlia mohitanch...@gmail.com wrote:
On Fri, Feb 3, 2012 at 7:32 AM, Jonathan Ellis jbel...@gmail.com wrote:
It's a warn because it's nonsense for the JVM to report that an column
+ overhead, takes less space than just
I guess this is not really a WARN in that case.
On Tue, Jan 31, 2012 at 4:29 PM, aaron morton aa...@thelastpickle.com wrote:
The ratio is the ratio of serialised bytes for a memtable to actual JVM
allocated memory. Using a ratio below 1 would imply the JVM is using less
bytes to store the
I have the same experience. Wondering what's causing this? One thing I
noticed is that this happens if server is idle for some time and then
load starts going high is when I start to see these messages.
On Mon, Jan 30, 2012 at 4:54 PM, Roshan codeva...@gmail.com wrote:
Hi All
Time to time I am
I think the problem stems when you have data in a column that you need
to run adhoc query on which is not denormalized. In most cases it's
difficult to predict the type of query that would be required.
Another way of solving this could be to index the fields in search engine.
On Fri, Jan 20,
What's the version of Java do you use? Can you try reducing NewSize
and increasing Old generation? If you are on old version of Java I
also recommend upgrading that version.
On Thu, Jan 19, 2012 at 3:27 AM, Rene Kochen
rene.koc...@emea.schange.com wrote:
Thanks for your comments. The application
You need to shard your rows
On Wed, Jan 18, 2012 at 5:46 PM, Kamal Bahadur mailtoka...@gmail.com wrote:
Anyone?
On Wed, Jan 18, 2012 at 9:53 AM, Kamal Bahadur mailtoka...@gmail.com
wrote:
Hi All,
It is great to know that Cassandra column family can accommodate 2 billion
columns per row!
Have you tried running repair first on each node? Also, verify using
df -h on the data dirs
On Tue, Jan 17, 2012 at 7:34 AM, Marcel Steinbach
marcel.steinb...@chors.de wrote:
Hi,
we're using RP and have each node assigned the same amount of the token
space. The cluster looks like that:
Is it possible to add Brisk only nodes to standard C* cluster? So if
we have node A,B,C with standard C* then add Brisk node D,E,F for
analytics?
What's the best way to install C*? Any good links?
Is it better to just create instances and install rpms on it first,
just like regular cluster and then create image from it? I am assuming
it's possible.
Are there any known issues when running C* on EC2?
How do other C* users deal with instance
Are all your nodes equally balanced in terms of read requests? Are you
using RandomPartitioner? Are you reading using indexes?
First thing you can do is compare iostat -x output between the 2 nodes
to rule out any io issues assuming your read requests are equally
balanced.
On Fri, Jan 6, 2012 at
On Fri, Jan 6, 2012 at 10:03 AM, Drew Kutcharian d...@venarc.com wrote:
Hi Everyone,
What's the best way to reliably have unique constraints like functionality
with Cassandra? I have the following (which I think should be very common)
use case.
User CF
Row Key: user email
Columns:
, no?
On Jan 6, 2012, at 10:38 AM, Mohit Anchlia wrote:
On Fri, Jan 6, 2012 at 10:03 AM, Drew Kutcharian d...@venarc.com wrote:
Hi Everyone,
What's the best way to reliably have unique constraints like functionality
with Cassandra? I have the following (which I think should be very common
This looks like right way to do it. But remember this still doesn't
gurantee if your clocks drifts way too much. But it's trade-off with
having to manage one additional component or use something internal to
C*. It would be good to see similar functionality implemented in C* so
that clients don't
like this has been tried
before, and for various reasons was not added. It's definitely
non-trivial to get right.
On Fri, 6 Jan 2012 13:33:02 -0800
Mohit Anchlia mohitanch...@gmail.com wrote:
This looks like right way to do it. But remember this still doesn't
gurantee if your clocks drifts way
You could read using Cassandra client and write to HDFS using Hadoop FS Api.
On Fri, Dec 23, 2011 at 11:20 PM, ravikumar visweswara
talk2had...@gmail.com wrote:
Jeremy,
We use cloudera distribution for our hadoop cluster and may not be possible
to migrate to brisk quickly because of flume/hue
Increasing memory in this case may not solve the problem. Share some
information about your workload. Cluster configuration, cache sizes etc.
You can also try getting java heap historgram to get more info on what's on
the heap.
On Mon, Dec 19, 2011 at 7:35 AM, Rene Kochen
bart@node1:~$ nodetool -h localhost getendpoints A UserDetails 4545027
192.168.81.5
192.168.81.2
192.168.81.3
Can you see what happens if you stop C* say on node .5 and write and
read at quorum?
On Wed, Dec 14, 2011 at 7:06 AM, Bart Swedrowski b...@timedout.org wrote:
On 14 December 2011
On Sun, Nov 20, 2011 at 4:01 AM, Boris Yen yulin...@gmail.com wrote:
A quick question, what if DC2 is down, and after a while it comes back on.
how does the data get sync to DC2 in this case? (assume hint is disable)
Thanks in advance.
Manually, use nodetool repair in rolling fashion on all
On Fri, Nov 18, 2011 at 6:39 AM, Sylvain Lebresne sylv...@datastax.com wrote:
On Fri, Nov 18, 2011 at 1:53 AM, Todd Burruss bburr...@expedia.com wrote:
I'm using cassandra 1.0. Been doing some testing on using cass's cache.
When I turn it on (using the CLI) I see ParNew jump from 3-4ms to
On Fri, Nov 18, 2011 at 7:47 AM, Sylvain Lebresne sylv...@datastax.com wrote:
On Fri, Nov 18, 2011 at 4:23 PM, Mohit Anchlia mohitanch...@gmail.com wrote:
On Fri, Nov 18, 2011 at 6:39 AM, Sylvain Lebresne sylv...@datastax.com
wrote:
On Fri, Nov 18, 2011 at 1:53 AM, Todd Burruss bburr
On Fri, Nov 18, 2011 at 9:42 AM, Sylvain Lebresne sylv...@datastax.com wrote:
On Fri, Nov 18, 2011 at 6:31 PM, Mohit Anchlia mohitanch...@gmail.com wrote:
On Fri, Nov 18, 2011 at 7:47 AM, Sylvain Lebresne sylv...@datastax.com
wrote:
On Fri, Nov 18, 2011 at 4:23 PM, Mohit Anchlia mohitanch
On Fri, Nov 18, 2011 at 1:46 PM, Todd Burruss bburr...@expedia.com wrote:
Ok, I figured something like that. Switching to
ConcurrentLinkedHashCacheProvider I see it is a lot better, but still
instead of the 25-30ms response times I enjoyed with no caching, I'm
seeing 500ms at 100% hit rate on
ParNew and other major phases recorded in the logs.
Are there any significant writes, memtable flushes etc occuring during
this time? How many read/sec and writes/sec?
What's the size of your row and columns that you are trying to retrieve?
On 11/18/11 2:40 PM, Mohit Anchlia mohitanch
On Mon, Nov 14, 2011 at 4:44 PM, Jake Luciani jak...@gmail.com wrote:
Re Simpler elasticity:
Latest opscenter will now rebalance cluster optimally
http://www.datastax.com/dev/blog/whats-new-in-opscenter-1-3
/plug
Does it cause any impact on reads and writes while re-balance is in
progress?
Can you temporarily increase the size of Heap and try?
On Fri, Nov 11, 2011 at 5:21 PM, Oleg Tsvinev oleg.tsvi...@gmail.com wrote:
Hi everybody,
We set row cache too high, 1 or so and now all our 6 nodes fail
with OOM. I believe that high row cache causes OOMs.
Now, we trying to change
We lockdown ssh to root from any network. We also provide individual
logins including sysadmin and they go through LDAP authentication.
Anyone who does sudo su as root gets logged and alerted via trapsend.
We use firewalls and also have a separate vlan for datastore servers.
We then open only
Transparent on disk encryption with pluggable keyprovider will also be
really helpful to secure sensitive information.
On Sun, Nov 6, 2011 at 9:42 AM, Aaron Turner synfina...@gmail.com wrote:
The intent was to have a lighter solution for common problems then
having to go with Hadoop or
On Thu, Nov 3, 2011 at 5:46 AM, Peter Tillotson slatem...@yahoo.co.uk wrote:
I'm using Cassandra as a big graph database, loading large volumes of data
live and linking on the fly.
Not sure if Cassandra is right fit to model complex vertexes and edges.
The number of edges grow geometrically
On Sun, Oct 30, 2011 at 6:53 PM, Chris Goffinet c...@chrisgoffinet.com wrote:
On Sun, Oct 30, 2011 at 3:34 PM, Sorin Julean sorin.jul...@gmail.com
wrote:
Hey Chris,
Thanks for sharing all the info.
I have few questions:
1. What are you doing with so much memory :) ? How much of it do
at 10:22 AM, Aditya Narayan ady...@gmail.com wrote:
..so that I can retrieve them through a single query.
For reading cols from two CFs you need two queries, right ?
On Sat, Oct 29, 2011 at 9:53 PM, Mohit Anchlia mohitanch...@gmail.com
wrote:
Why not use 2 CFs?
On Fri, Oct 28, 2011 at 9
On Sat, Oct 29, 2011 at 11:23 AM, Aditya Narayan ady...@gmail.com wrote:
@Mohit:
I have stated the example scenarios in my first post under this heading.
Also I have stated above why I want to split that data in two rows like
Ikeda below stated, I'm too trying out to prevent the frequently
On Tue, Oct 25, 2011 at 11:18 AM, Dan Hendry dan.hendry.j...@gmail.com wrote:
2. ... So I am going to use rotational disk for the commit log and an SSD
for data. Does this make sense?
Yes, just keep in mind however that the primary characteristic of SSDs is
lower seek times which translates
and in memory caching of
columns that Cassandra offers?
Cheers,
Alex
On Tue, Oct 25, 2011 at 9:06 PM, Todd Burruss bburr...@expedia.com wrote:
This may help determining your data storage requirements ...
http://btoddb-cass-storage.blogspot.com/
On 10/25/11 11:22 AM, Mohit Anchlia
On Sun, Oct 16, 2011 at 2:20 AM, Radim Kolar h...@sendmail.cz wrote:
Dne 10.10.2011 18:53, Mohit Anchlia napsal(a):
Does it mean you are not updating a row or deleting them?
yes. i have 350m rows and only about 100k of them are updated.
Can you look at JMX values of
BloomFilter* ?
i
Do you have same seed node specified in cass-analysis-1 as cass-1,2,3?
I am thinking that changing the seed node in cass-analysis-2 and
following the directions in
http://wiki.apache.org/cassandra/FAQ#schema_disagreement might solve
the problem. Somone please correct me.
On Thu, Oct 13, 2011 at
You mentioned this happens only on one node? How many nodes do you
have? Is it possible to turn off this node completely and run
compactions on other nodes and see if this happens there too?
Also, you mentioned this happens after compaction. Did you mean during
compaction or right after it? What
, Oct 12, 2011 at 1:13 PM, Mohit Anchlia mohitanch...@gmail.com
wrote:
Yes. If you have exhausted all the options I think it will be good to
see if this issue persists accross other nodes after you decommission
that node.
If this is not production and issue is reproducible easily you can
also
to
compact more often.
On Sun, Oct 9, 2011 at 7:09 AM, Radim Kolar h...@sendmail.cz wrote:
Dne 7.10.2011 23:16, Mohit Anchlia napsal(a):
You'll see output like:
Offset SSTables
1 8021
2 783
Which means 783 read operations accessed 2 SSTables
thank
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