After a little testing I see that the client has a time-out because the
server takes longer.
This large batch_mutate took 5 seconds in Cassandra 1.0.11
The same batch_mutate takes three minutes in Cassandra 1.2.18
Is that normal!?
Thanks,
Rene
2015-02-04 18:29 GMT+01:00 Rene Kochen :
>
Hi all,
I have a problem with my client on Cassandra 1.2.18 which I did not have on
Cassandra 1.0.11
I create a big row with a lot of super-columns.
When writing that row using batch_mutate, I receive the following error in
my client:
"A connection attempt failed because the connected party did
n Thu, Aug 14, 2014 at 4:53 PM, Rene Kochen
> wrote:
>
>> Hi all,
>>
>> I have a question about communication between two data-centers, both with
>> replication-factor three.
>>
>> If I read data using local_quorum from datacenter1, I see that digest
>>
Hi all,
I have a question about communication between two data-centers, both with
replication-factor three.
If I read data using local_quorum from datacenter1, I see that digest
requests are sent to datacenter2. This is for read-repair I guess. How can
I prevent this from happening? Setting read_
des in the same
data-center and rack.
Thanks again!
Rene
2014-08-05 20:05 GMT+02:00 Robert Coli :
> On Tue, Aug 5, 2014 at 3:52 AM, Rene Kochen
> wrote:
>
>> Do I have to run full repairs after this change? Because the yaml file
>> states: IF YOU CHANGE THE SNITCH AFTER DA
nitch puts all endpoints in the same
data-center and rack, isn't the result of the endpoint selection basically
the same?
Thanks!
Rene
2014-08-05 12:56 GMT+02:00 Mark Reddy :
> Yes, you must run a full repair for the reasons stated in the yaml file.
>
>
> Mark
>
>
> O
Hi all,
I want to add a data-center to an existing single data-center cluster.
First I have to make the existing cluster multi data-center compatible.
The existing cluster is a 12 node cluster with:
- Replication factor = 3
- Placement strategy = SimpleStrategy
- Endpoint snitch = SimpleSnitch
I
Thanks!
Does that mean that cfhistograms scans all Statistics.db files in order to
populate the "Row Size" and "Column Count" values?
2013/10/1 Tyler Hobbs
>
> On Tue, Oct 1, 2013 at 2:34 PM, Rene Kochen
> wrote:
>
>> However, "Row Size" a
If I look at Read Latency I see indeed that they are reset during two runs
of cfhistograms. However, "Row Size" and "Column Count" keep the values.
When are they re-evaluated?
Thanks!
Rene
2013/10/1 Richard Low
> On 1 October 2013 16:21, Rene Kochen wrote:
>
>
Quick question.
I am using Cassandra 1.0.11
When is nodetool cfhistograms output reset? I know that data is collected
during read requests. But I am wondering if it is data since the beginning
(start of Cassandra) or if it is reset periodically?
Thanks!
Rene
Nice! Thats explains it.
2013/9/19 Robert Coli
> On Thu, Sep 19, 2013 at 3:08 AM, Rene Kochen wrote:
>
>> And how does cfstats track the maximum size? What does "Compacted" mean
>> in "Compacted row maximum size".
>>
>
> That maximum size
That is indeed how I read it. The maximal size is 3 rows with an offset of
126934, while cfstats reports 43388628.
Thanks,
Rene
2013/9/19 Richard Low
> On 19 September 2013 10:31, Rene Kochen wrote:
>
> I use Cassandra 1.0.11
>>
>> If I do cfstats for a particular c
sponse to the read request, while
> cfstats tracks the largest row stored on given node.
>
> M.
>
> W dniu 19.09.2013 11:31, Rene Kochen pisze:
>
> Hi all,
>>
>> I use Cassandra 1.0.11
>>
>> If I do cfstats for a particular column family, I see a
Hi all,
I use Cassandra 1.0.11
If I do cfstats for a particular column family, I see a "Compacted row
maximum size" of 43388628
However, when I do a cfhistograms I do not see such a big row in the Row
Size column. The biggest row there is 126934.
Can someone explain this?
Thanks!
Rene
reside on the first node (actually
the first three nodes because of the replication factor of three).
Thanks,
Rene
2013/6/28 Rene Kochen
> Hi All,
>
> I have the following situation:
>
> - Cassandra 1.0.11
> - A 6 node cluster
> - Random partitioner
> - Tokens are bal
Hi All,
I have the following situation:
- Cassandra 1.0.11
- A 6 node cluster
- Random partitioner
- Tokens are balanced (according to node-tool)
- Data-load is balanced (according to node-tool)
I have a customers column-family with 100 customers. I also have a test
client which requests ran
ve DC) will take too long. I expect
the data to grow significantly.
It makes more sense to use the second cluster as a hot standby (and make
snapshots on both clusters).
Rene
2013/3/16 Aaron Turner
> On Fri, Mar 15, 2013 at 10:35 AM, Rene Kochen
> wrote:
> > Hi Aaron,
> >
>
put the backup cluster close to the live cluster with a
gigabit connection only for Cassandra.
Thanks!
Rene
2013/3/15 Aaron Turner
> On Fri, Mar 15, 2013 at 3:12 AM, Rene Kochen
> wrote:
> > Thank you. I have a high bandwidth connection. But that also means that
> > regu
the data is going from one data centre to
> another, unless you have a high bandwidth connection between data centres
> or you have a small amount of data.
>
> Jabbar Azam
> On 14 Mar 2013 14:31, "Rene Kochen" wrote:
>
>> Hi all,
>>
>> Is the follo
Hi all,
Is the following a good backup solution.
Create two data-centers:
- A live data-center with multiple nodes (commodity hardware). Clients
connect to this cluster with LOCAL_QUORUM.
- A backup data-center with 1 node (with fast SSDs). Clients do not connect
to this cluster. Cluster only us
> If is still shows as down can you post the output from nodetool gossipinfo
> from 9.109 and the node that sees 9.109 as down.
>
> Cheers
>
>
> -
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 18/
I have a four node EC2 cluster.
Three machines show via nodetool ring that all machines are UP.
One machine shows via nodetool ring that one machine is DOWN.
If I take a closer to the machine reporting the other machine as down, I
see the following:
- StorageService.UnreachableNodes = 10.49.9.10
Is this a bug? I'm using Cassandra 1.0.11:
INFO 13:45:43,750 Compacting
[SSTableReader(path='d:\data\Traxis\Parameters-hd-47-Data.db'),
SSTableReader(path='d:\data\Traxis\Parameters-hd-44-Data.db'),
SSTableReader(path='d:\data\Traxis\Parameters-hd-46-Data.db'),
SSTableReader(path='d:\data\Traxis\P
ry_compaction_limit in the yaml. Note this
> is often a simple / quick fix that can increase IO load and slow down
> compaction. The harder thing is to tune the JVM memory settings (the
> defaults often do a good job).
>
> Hope that helps.
>
> -
> Aaron Morton
&g
> -
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 15/09/2012, at 6:32 AM, Rene Kochen wrote:
>
> Hi all,
>
> Does minor compaction delete expired column-tombstones when the row is
> also present in another
Hi all,
Does minor compaction delete expired column-tombstones when the row is
also present in another table which is not subject to the minor
compaction?
Example:
Say there are 5 SStables:
- Customers_0 (10 MB)
- Customers_1 (10 MB)
- Customers_2 (10 MB)
- Customers_3 (10 MB)
- Customers_4 (30
onmorton
> http://www.thelastpickle.com
>
> On 17/08/2012, at 2:58 AM, Rene Kochen wrote:
>
> Hi
>
> I have a cluster of 7 nodes:
>
> - Windows Server 2008
> - Cassandra 0.7.10
> - The nodes are identical (hardware, configuration and client request load)
> -
l the RAM of the machine, but you won't run into swapping
> hell.
>
> So, disable mmap, benchmark it, and see if it outperforms running with
> mmap. I'm pretty sure you will find that it does.
>
>
> /Henrik
>
>
> On Mon, Sep 10, 2012 at 4:02 PM, Rene Kochen > wr
mains the property of the sender. You must not use,
> disclose, distribute, copy, print or rely on this e-mail. If you have
> received this message in error, please contact the sender immediately and
> irrevocably delete this message and any copies.
>
> *From:* Rene Kochen [mailto:re
r support Windows as our production platform.
>
> Regards,
> Oleg
>
>
> On 2012-09-10 09:00:02 +, Rene Kochen said:
>
> Hi all,
>>
>> On my test cluster I have three Windows Server 2008 R2 machines running
>> Cassandra 1.0.11
>>
>> If i
) Restart Cassandra
Thanks
Rene
2012/9/7 Rob Coli
> On Fri, Sep 7, 2012 at 6:38 AM, Rene Kochen
> wrote:
> > If I use node-tool drain, it does stop accepting writes and flushes the
> > tables. However, is it normal that the commit log files are not deleted
> and
>
Hi All,
I have a question about node-tool drain on a single Cassandra 1.0.11 node:
If I use node-tool drain, it does stop accepting writes and flushes the
tables. However, is it normal that the commit log files are not deleted and
that it gets replayed?
Because if I do the following:
1) Write s
Okay, thanks for the info! I was just trying to understand what I saw.
2012/8/20 Tyler Hobbs :
>
>
> On Sun, Aug 19, 2012 at 6:27 AM, Rene Kochen
> wrote:
>>
>>
>> Why does it not increase when servicing a range operation?
>
>
> It doesn't becau
Hi All,
I have a question about the ColumnFamilies.ReadCount counter.
I use:
- One node.
- Cassandra 1.0.10.
- No row cache.
- One table "Products" containing a few rows
If I use the cli command "list Products", the ColumnFamilies.ReadCount
counter does not increase (also via nodetool cfstats).
Hi
I have a cluster of 7 nodes:
- Windows Server 2008
- Cassandra 0.7.10
- The nodes are identical (hardware, configuration and client request load)
- Standard batch file with 8GB heap
- I use disk_access_mode = standard
- Random partitioner
- TP stats shows no problems
- Ring command shows no pr
what gossip is telling it. Add
it as a new line at the bottom of cassandra-env.sh.
If it's still failing watch the logs and see what it says when it marks the
other as been down.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 1/02/201
I have a cluster with seven nodes.
If I run the node-tool ring command on all nodes, I see the following:
Node1 says that node2 is down.
Node 2 says that node1 is down.
All other nodes say that everyone is up.
Is this normal behavior?
I see no network related problems. Also no problems between
Thanks for this very helpful info. It is indeed a production site which I
cannot easily upgrade. I will try the various gc knobs and post any positive
results.
-Original Message-
From: sc...@scode.org [mailto:sc...@scode.org] On Behalf Of Peter Schuller
Sent: vrijdag 20 januari 2012 4:23
Thanks for your comments. The application is indeed suffering from a freezing
Cassandra node. Queries are taking longer than 10 seconds at the moment of a
full garbage collect.
Here is an example from the logs. I have a three node cluster. At some point I
see on a node the following log:
21:53
Thanks for your quick response!
I am currently running the performance tests with extended gc logging. I will
post the gc logging if clients time out at the same moment that the full
garbage collect runs.
Thanks
Rene
-Original Message-
From: sc...@scode.org [mailto:sc...@scode.org] On
: Question about minor compaction
On Fri, Nov 4, 2011 at 5:22 PM, Rene Kochen
wrote:
> Thanks for your quick response.
>
> I indeed see that similar sized files are compacted. However, for four
> similar 1GB files, this is not what I see.
>
> The documentation states:
>
&g
ely
(when there are four similar sized files), but waits (up to 32)?
Thanks!
-Original Message-
From: Radim Kolar [mailto:h...@sendmail.cz]
Sent: vrijdag 4 november 2011 16:48
To: user@cassandra.apache.org
Subject: Re: Question about minor compaction
Dne 4.11.2011 16:16, Rene Kochen napsal
I'm using Cassandra 0.7.9.
Ok, so in this version, Cassandra waits with compaction. But when (in my
original example) are the four 1GB files compacted?
Thanks!
-Original Message-
From: Radim Kolar [mailto:h...@sendmail.cz]
Sent: vrijdag 4 november 2011 15:55
To: user@cassandra.apache.o
Assume the following default settings: min_compaction_threshold = 4,
max_compaction_threshold = 32.
When I start a bulk insert in Cassandra, I see minor compactions work: all
similar sized files are compacted when there are four of them. However, when
files gets larger, Cassandra waits with min
What is the difference between these JMX column family attributes:
TotalDiskSpaceUsed and LiveDiskSpaceUsed
Thanks!
Rene
-
From: Sylvain Lebresne [mailto:sylv...@datastax.com]
Sent: vrijdag 21 oktober 2011 13:16
To: user@cassandra.apache.org
Subject: Re: log line question
On Fri, Oct 21, 2011 at 12:48 PM, Rene Kochen
wrote:
> Given the following log line:
>
>
>
> DEBUG [ReadStage:20] 11:39:07,028
Given the following log line:
DEBUG [ReadStage:20] 11:39:07,028 collecting 0 of 2147483647:
SuperColumn(2150726f70657274696573 [64617461:false:4@1319189945952058,])
What does "false:4" in the column mean?
Thanx!
Rene
good idea to upgrade to the latest stable release
before spending a lot of time debugging :)
On Fri, Oct 7, 2011 at 8:33 AM, Rene Kochen
wrote:
> If I trigger hint delivery using JMX, it works. I see in the log:
>
>
>
> 2011-10-07 15:17:51,216 INFO 15:17:51,216 Started hinted ha
deliver them if you restart it (i think).
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 6/10/2011, at 11:40 PM, Rene Kochen wrote:
Node 3 is up (using ring on node 1).
There is no HH task (active = 0, pending = 0, completed
/10/2011, at 10:35 PM, Rene Kochen wrote:
I'am using Cassandra 0.7.7 and have a question about hinted handoff.
I have a cluster of three nodes.
I stop node 3.
I see that the hint count for node 3 increases on node 1 (countPendingHints =
28709).
However, when I start node 3 again, I ca
I'am using Cassandra 0.7.7 and have a question about hinted handoff.
I have a cluster of three nodes.
I stop node 3.
I see that the hint count for node 3 increases on node 1 (countPendingHints =
28709).
However, when I start node 3 again, I cannot see anything in the log regarding
hinted handoff
I try to understand the flushing behavior in Cassandra 0.8
When I create rows, after a few seconds, I see the following line in the log:
INFO 11:18:46,470 flushing high-traffic column family
ColumnFamilyStore(table='Traxis', columnFamily='Customers')
INFO 11:18:46,471 Enqueuing flush of
Memtabl
aux | grep javaagent
The args to the java process should include -javaagent:bin/../lib/jamm-0.2.2.jar
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 17 Jun 2011, at 22:18, Rene Kochen wrote:
Since using cassandra 0.8, I see the followi
Since using cassandra 0.8, I see the following warning:
WARN 12:05:59,807 MemoryMeter uninitialized (jamm not specified as java agent);
assuming liveRatio of 10.0. Usually this means cassandra-env.sh disabled jamm
because you are using a buggy JRE; upgrade to the Sun JRE instead
I'am using Sun
: java.io.EOFException with version 0.7.6
Would you have a simple script to reproduce the issue ?
And could you open a JIRA ticket.
Sylvain
On Thu, May 19, 2011 at 4:22 PM, Rene Kochen
wrote:
> I have some severe problems on our production site.
> I created the following test program to reprodu
I have some severe problems on our production site.
I created the following test program to reproduce the issue with Cassandra
0.7.6 (with empty data set).
I use the following data-model
column_metadata: []
name: Customers
column_type: Super
gc_grace_seconds: 60
I have a super-column-family wit
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