I add a new node to ring(version 1.1.6), after more than 30 hours, it is
still in the 'Joining' state
Address DC RackStatus State Load
Effective-Ownership Token
141784319550391026443072753096570088105
10.28.78.123datacenter1 rack1 Up
We were using SimpleAuthenticator on 1.1.x, it worked fine.
While testing 1.2, I have put classes under example/simple_authentication
in a jar and copy to lib directory, the class is loaded. however, when I
try to connect with correct user/password, it gives me error
./cqlsh s2.dsat103-e1a -u
I'd like to upgrade from 1.1.6 to 1.2.1, one big feature in 1.2 is that it
can have multiple tokens in one node. but there is only one token in 1.1.6.
how can I upgrade to 1.2.1 then breaking the token to take advantage of
this feature? I went through this doc but it does not say how to change
We have 8 nodes cluster in Casandra 1.1.0, with replication factor is 3. We
found that when you just insert data, not only WriteCount increases, the
ReadCount also increases.
How could this happen? I am under the impression that readCount only counts
the reads from client.
Thanks,
Daning
://www.thelastpickle.com
On 3/02/2013, at 11:32 PM, Manu Zhang owenzhang1...@gmail.com wrote:
On Sun 03 Feb 2013 05:45:56 AM CST, Daning Wang wrote:
I'd like to upgrade from 1.1.6 to 1.2.1, one big feature in 1.2 is
that it can have multiple tokens in one node. but there is only one
token in 1.1.6.
how
, then do the shuffle when things are
stable.
Cheers
-
Aaron Morton
Freelance Cassandra Developer
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 12/02/2013, at 2:55 PM, Daning Wang dan...@netseer.com wrote:
Thanks Aaron.
I tried to migrate existing cluster(ver
-
Aaron Morton
Freelance Cassandra Developer
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 13/02/2013, at 8:02 AM, Daning Wang dan...@netseer.com wrote:
No, I did not run shuffle since the upgrade was not successful.
what do you mean reverting the changes to num_tokens
#num_tokens commented in the cassandra.yaml and would
set the initial_token at the same value than in the pre-C*1.2.x-uprage
configuration.
Alain
2013/2/14 Daning Wang dan...@netseer.com
Thanks Aaron and Manu.
Since we are using 1.1, there is no num_taken parameter. when I upgrade
to 1.2
We try to implement an ordered queue system in Cassandra(ver 0.8.5). In
initial design we use a row as queue, a column for each item in queue.
that means creating new column when inserting item and delete column when
top item is popped. Since columns are sorted in Cassandra we got the ordered
How is the performance of ByteOrderedPartitioner, compared to
RandomPartitioner? the perforamnce when getting data with single key, does
it use same algorithm?
I have read that the downside of ByteOrderedPartitioner is creating hotspot.
But if I have 4 nodes and I set RF to 4, that will replicate
@aaronmorton
http://www.thelastpickle.com
On 30/09/2011, at 3:27 AM, Daning Wang wrote:
Jonathan/Aaron,
Thank you guy's reply, I will change GCGracePeriod to 1 day to see what
will happen.
Is there a way to purge tombstones at anytime? because if tombstones affect
performance, we want them
I have Cassandra server which has JVM setting -Xms4G -Xmx4G, but why top
reports 15G RES memory and 11G SHR memory usage? I understand that -Xmx4G
is only for the heap size. but it is strange that OS reports 2.5 times
memory usage. Are there a lot of memory used by JNI? Please help to explain
Hi All,
We are getting TimedOutException() when inserting data into Cassandra, it
was working fine for a few months, but suddenly got this problem. I have
increase rpc_timout_in_ms to 3, but it still timed out in 30 secs.
I turned on debug, I saw many of this error in the log
DEBUG
Hi all,
We have 5 nodes cluster(0.8.6), but the performance from one node is way
behind others, I checked tpstats, It always show non-zero pending
ReadStage, I don't see this problem on other nodes.
What caused the problem? I/O? Memory? Cpu usage is still low. How to fix
this problem?
? 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 10:11 AM, Daning Wang dan...@netseer.com wrote:
Hi all
Hi All,
We have 5 nodes cluster(on 0.8.6), but two machines are slower and have
less memory, so the performance was not good on those two machines for
large volume traffic.I want to move some data from slower machine to faster
machine to ease some load, the token ring will not be equally
.
Please note that someone else may have some better insights than I into
whether or not your strategy is going to be effective. On the surface I
think what you are doing is logical, but I'm unsure of the actual
performance gains you'll see.
David
On Wed, Jan 11, 2012 at 1:32 PM, Daning Wang dan
I just got this error : All host pools marked down. Retry burden pushed
out to client. in a few clients recently, client could not recover, we
have to restart client application. we are using 0.8.0.3 hector.
At that time we did compaction for a CF, it takes several hours, server
was busy. But
Hi All,
We got lots of Exception in the log, and later the server crashed. any idea
what is happening and how to fix it?
ERROR [RequestResponseStage:4] 2012-03-21 04:16:30,482
AbstractCassandraDaemon.java (line 139) Fatal exception in thread
Thread[RequestResponseStage:4,5,main]
and we are on 0.8.6.
On Wed, Mar 21, 2012 at 10:24 AM, Daning Wang dan...@netseer.com wrote:
Hi All,
We got lots of Exception in the log, and later the server crashed. any
idea what is happening and how to fix it?
ERROR [RequestResponseStage:4] 2012-03-21 04:16:30,482
Hi,
How to find a column family from a cfId? I got a bunch of exception, want
to find out which CF has problem.
java.io.IOError:
org.apache.cassandra.db.UnserializableColumnFamilyException: Couldn't find
cfId=1744830464
at
.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 22/03/2012, at 6:27 AM, Daning Wang wrote:
and we are on 0.8.6.
On Wed, Mar 21, 2012 at 10:24 AM, Daning Wang dan...@netseer.com wrote:
Hi All,
We got lots of Exception
will be marked as UNREACHABLE if it is DOWN or if it did not
respond in time.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 23/03/2012, at 11:29 AM, Daning Wang wrote:
Thanks Aaron. when I do describe cluster, always
Hi all,
We are using Hector and ofter we see lots of timeout exception in the log,
I know that the hector can failover to other node, but I want to reduce the
number of timeouts.
any hector parameter I should change to reduce this error?
also, on the server side, any kind of tunning need to do
://www.thelastpickle.com
On 6/04/2012, at 5:30 AM, Daning Wang wrote:
Hi all,
We are using Hector and ofter we see lots of timeout exception in the
log, I know that the hector can failover to other node, but I want to
reduce the number of timeouts.
any hector parameter I should change to reduce
Developer
@aaronmorton
http://www.thelastpickle.com
On 10/04/2012, at 8:08 AM, Daning Wang wrote:
Thanks Aaron! Here is the exception, is that the timeout between nodes?
any parameter I can change to reduce timeout?
me.prettyprint.hector.api.exceptions.HectorTransportException
We got exception UnserializableColumnFamilyException: Couldn't find
cfId=1075 in the log of one node, describe cluster showed all the nodes in
same schema version. how to fix this problem? did repair but looks does not
work, haven't try scrub yet.
We are on v1.0.3
ERROR [HintedHandoff:1631]
for other
CF's may have been dropped.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 16/05/2012, at 2:27 AM, Daning Wang wrote:
We got exception UnserializableColumnFamilyException: Couldn't find
cfId=1075 in the log of one node
** **
** **
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
** **
On 23/05/2012, at 9:34 AM, Daning Wang wrote:
Hello,
What is the pros and cons to choose different number of replication factor
in term
Hi All,
We have 8 nodes cluster(replication factor is 3), about 50G data on each
node. we need to change the cluster to multi-center environment(to EC2).
the data need to have one replica on ec2.
Here is the plan,
- Change cluster config to mult-center.
- Add 2 or 3 nodes in another center,
Hi Guys,
What is the cassandra solution for remote backup besides multi-center? I
hope I can do incremental backup to remote database center.
Thanks,
Daning
We have multi-center deployment. data from some tables we don't want to
sync to other center. could we set replication factor to 0 on other data
center? what is the best to way for not syncing some data in a cluster?
Thanks in advance,
Daning
, Jun 7, 2013 at 11:49 PM, Daning Wang dan...@netseer.com wrote:
We have deployed multi-center but got performance issue. When the nodes
on other center are up, the read response time from clients is 4 or 5 times
higher. when we take those nodes down, the response time becomes
normal(compare
how replica acknowledgement are waited for.
--
Sylvain
On Wed, Jun 12, 2013 at 4:56 AM, Alain RODRIGUEZ arodr...@gmail.comwrote:
counter will replicate to all replicas during write regardless the
consistency level
I that the normal behavior or a bug ?
2013/6/11 Daning Wang dan
How does dynamic snitch work with EC2MultiRegionSnitch? Can dynamic routing
only happen in one data center? We don't wan to have the requests routed to
another center even nodes are idle in other side since the network could be
slow.
Thanks in advance,
Daning
We noticed that key cache could not be fully populated, we have set the key
cache size to 1024M.
key_cache_size_in_mb: 1024
But none of nodes showed the cache capacity is 1G, we have recently
upgraded to 1.2.5, could be an issue in that version?
Token: (invoke with -T/--tokens to
We are running 1.2.5 on 8 nodes(256 tokens). all the nodes are running on
same type of machine. and db size is about same. but recently we checked
ReadCount stats through jmx, and found that some nodes got 3 times change
rate(we have calculated the changes per minute) than others.
We are using
Thanks. actually I forgot to mention it is multi-center environment and we
have dynamic snitch disabled. because we saw some performance impact on the
multi-center environment.
On Wed, Oct 30, 2013 at 11:12 AM, Piavlo lolitus...@gmail.com wrote:
On 10/30/2013 02:06 AM, Daning Wang wrote
How to move a token to another node on 1.2.x? I have tried move command,
[cassy@dsat103.e1a ~]$ nodetool move 168755834953206242653616795390304335559
Exception in thread main java.io.IOException: target token
168755834953206242653616795390304335559 is already owned by another node.
at
Does Cassandra put keys in key cache during the write path?
If I have two tables, the key cache for the first table was warmed up
nicely, and I want to insert millions rows in the second table, and there
is no read on the second table yet, will that affect cache hit ratio for
the first table?
We are running Cassandra 1.2.5
We have 8 nodes cluster, and we removed one machine from cluster and try to
add it back(the purpose is we are using vnodes, some node has more tokens
so by rejoining this machine we hope it could get some loads from the busy
machines). But we got following exception
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