Hi,
We have a pretty outdated Cassandra cluster running version 2.0.x. Instead
of doing step by step upgrades (2.0 -> 2.1, 2.1 -> 2.2, 2.2 -> 3.0, 3.0 ->
3.11.x), would it be possible to add new nodes with a recent version (say
3.11.x) and start decommissioning the old ones until we have a cluster
3.0.17 as an intermediary step (I
> would do), but don't upgrade to 2.2. Also make sure to read carefully
> https://github.com/apache/cassandra/blob/cassandra-3.11/NEWS.txt It's a
> long read but it's important. There are lots of changes between all these
> ve
Hi,
I'd like to update a small cluster running 2.0.17 (on virtual private
servers with ssh access) to a new version of Cassandra and in the process,
I'd like to make it easier to update/add nodes/run maintenance in the
future. What tools are common to use to automate such tasks? RIght now
everythi
Our nodes go down periodically, around 1-2 times each day. Downtime is from
<1 second to 30 or so seconds.
INFO [GossipTasks:1] 2016-02-22 10:05:14,896 Gossiper.java (line 992)
InetAddress /109.74.13.67 is now DOWN
INFO [RequestResponseStage:8844] 2016-02-22 10:05:38,331 Gossiper.java
(line 978)
ised if they make sense.
>
> http://blog.mikiobraun.de/2010/08/cassandra-gc-tuning.html
>
> Hannu
>
>
> On 23 Feb 2016, at 16:08, Joel Samuelsson
> wrote:
>
> Our nodes go down periodically, around 1-2 times each day. Downtime is
> from <1 second to 30 or so se
behavior.
>
>
>
>
>
> Sean Durity
>
>
>
> *From:* Joel Samuelsson [mailto:samuelsson.j...@gmail.com]
> *Sent:* Tuesday, February 23, 2016 9:41 AM
> *To:* user@cassandra.apache.org
> *Subject:* Re: Nodes go down periodically
>
>
>
> Hi,
>
>
>
> Th
If you see a lapse of connectivity no more than once or twice a day,
>> consider yourselves lucky.
>>
>> Is it only one node at a time that goes down, and at widely dispersed
>> times?
>>
>> How many nodes?
>>
>> -- Jack Krupansky
>>
>> On T
I'm trying to add a new node to a small existing cluster. During the
bootstrap one of the nodes went down. I'm not sure at what point in the
process the node went down, all files may have been sent before that
happened. Currently:
nodetool netstats says that all files are received 100%
nodetool sta
So, I have a cluster which grew too large data-wise so that compactions no
longer worked (because of full disk). I have now added new nodes so that
data is spread more thin. However, I know there are incosistencies in the
cluster and I need to run a repair but those also fail because of out of
disk
Yeah, sounds right. What I'm worried about is the following:
I used to have only 2 nodes with RF 2 so both nodes had a copy of all data.
There were incosistencies since I was unable to run repair, so some parts
of the data may only exist on one node. I have now added two nodes, thus
changing which
bootstrap will stream from the primary replica of the range it
> is taking ownership of. So Node 3 would have to stream from Node 2 if it
> was taking ownership of Node 2's tokens.
> On 13 Nov. 2017 05:00, "Joel Samuelsson"
> wrote:
>
>> Yeah, sounds right. What I
Hi,
I have an older system (C* 2.1) using Thrift tables on which I want to
alter a column composite. Right now it looks like (int, int, string) but I
want it to be (int, int, string, string). Is it possible to do this on a
live cluster without deleting the old data? Can you point me to some
docume
REATE TABLE events (
key text,
column1 int,
column2 int,
column3 text,
column4 text,
value text,
PRIMARY KEY(key, column1, column2, column3, column4)
) WITH COMPACT STORAGE
Is this possible?
Best regards,
Joel
2018-01-12 16:53 GMT+01:00
n however alter your existing table to only add column4 using cqlsh
> and cql, even if this table as created back with C* 1.X for instance
>
> On 18 January 2018 at 11:14, Joel Samuelsson
> wrote:
>
>> So to rephrase that in CQL terms I have a table like this:
>&g
_using/use_alter_add.html
>
> But I'm worried that your initial requirement was to change the clustering
> key, as Alexander stated, you need to create a new table and transfer your
> data in it
>
> On 18 January 2018 at 12:03, Joel Samuelsson
> wrote:
>
>> It was indeed create
. Is there anything specific happening within
Cassandra with a 4 hour interval?
Any help is much appreciated,
Joel Samuelsson
(it's been running for a week or
so). Just to be clear, another test on Amazon EC2 mentioned above (without
the Datastax AMI) shows the GC freezes.
If any other information is needed, just let me know.
Best regards,
Joel Samuelsson
; Can you share the GC logs for the systems you are running problems into?
>
> Yogi
>
>
> On Wed, Jan 22, 2014 at 6:50 AM, Joel Samuelsson <
> samuelsson.j...@gmail.com> wrote:
>
>> Hello,
>>
>> We've been having problems with long GC pauses and can&
antly afterwards.
Any ideas of why this might be happening?
We have swap disabled, JNA enabled, no CPU spikes at the time, no disk I/O
spikes at the time. What else could be causing this?
/Joel Samuelsson
;
> -XX:+PrintSafepointStatistics -XX:PrintSafepointStatisticsCount=1
>
>
> On 29 January 2014 16:23, Joel Samuelsson wrote:
>
>> Hi,
>>
>> We've been trying to figure out why we have so long and frequent
>> stop-the-world GC even though we have basically
We have had similar issues and upgrading C* to 2.0.x and Java to 1.7 seems
to have helped our issues.
2014-02-13 Keith Wright :
> Frank did you ever file a ticket for this issue or find the root cause? I
> believe we are seeing the same issues when attempting to bootstrap.
>
> Thanks
>
> From:
IncCollectionPause [ 111 0
>>>>0] [ 0 0 0 0 27586] 0
>>>>
>>>> And the total thime for which application threads were stopped is 27.58
>>>> seconds.
>>>>
>>>>
What happens if a ParNew is triggered while CMS is running? Will it wait
for the CMS to finish? If so, that would be the eplanation of our long
ParNew above.
Regards,
Joel
2014-02-20 16:29 GMT+01:00 Joel Samuelsson :
> Hi Frank,
>
> We got a (quite) long GC pause today on 2.0.5
I try to fetch all the row keys from a column family (there should only be
a couple of hundred in that CF) in several different ways but I get
timeouts whichever way I try:
Through the cassandra cli:
Fetching 45 rows is fine:
list cf limit 46 columns 0;
.
.
.
45 Rows Returned.
Elapsed time: 298 ms
I am on Cassandra 2.0.5. How can I use the trace functionality?
I did not check for exceptions. I will rerun and check.
Thanks for suggestions.
/Joel
2014-03-07 17:54 GMT+01:00 Duncan Sands :
> Hi Joel,
>
>
> On 07/03/14 15:22, Joel Samuelsson wrote:
>
>> I try to fetch
e not removed.
https://issues.apache.org/jira/browse/CASSANDRA-4314 seems to say that
tombstones on secondary indexes are not removed by a compaction. Do I need
to do it manually?
Best regards,
Joel Samuelsson
I'm testing triggers as part of a project and would like to add some
logging to it. I'm using the same log structure as in the trigger example
InvertedIndex but can't seem to find any logs. Where would I find the
logging? In the system logs or somewhere else?
/Joel
I found now that i logged with a too low log level set so it was filtered
from the system log. Logging with a more critical log level made the log
messages appear in the system log.
/Joel
2014-06-03 16:30 GMT+02:00 Joel Samuelsson :
> I'm testing triggers as part of a project and would
Thanks for the GC suggestion. It seems we didn't have enough CPU power to
handle both the data and GC. Increasing the number of CPU cores made
everything run smoothly at the same load.
2013/3/21 Andras Szerdahelyi
> Neat!
> Thanks.
>
> From: Sylvain Lebresne
> Reply-To: "user@cassandra.apac
Hi,
I've deleted a range of keys in my one node test-cluster and want to re-add
them with an older creation time. How can I make sure all tombstones are
gone so that they can be re-added properly? I've tried nodetool compact but
it seems some tombstones remain.
Best regards,
Joel Samuelsson
Hobbs
> You'll need to temporarily lower gc_grace_seconds for that column family,
> run compaction, and then restore gc_grace_seconds to its original value.
> See http://wiki.apache.org/cassandra/DistributedDeletes for more info.
>
>
> On Mon, Mar 25, 2013 at 7:40 AM, Joel
I see. The cleanup operation took several minutes though. This doesn't seem
normal then? My replication settings should be very normal (simple strategy
and replication factor 1).
2013/3/26 Tyler Hobbs
>
> On Tue, Mar 26, 2013 at 5:39 AM, Joel Samuelsson <
> samuelsson.j...
Strategy and RF 3, even if they dont
> have multiple DC's.
>
> Cheers
>
> -
> Aaron Morton
> Freelance Cassandra Consultant
> New Zealand
>
> @aaronmorton
> http://www.thelastpickle.com
>
> On 28/03/2013, at 3:34 AM, Joel Samuelsson
> wrote:
&
g with consistency level ONE.
What are the values for these settings in cassandra.yaml
memtable_total_space_in_mb: No value set in cassandra.yaml, so 1/3 of heap
according to documentation (2gb / 3)
memtable_flush_writers: No value set in cassandra.yaml, but only one data
directory so I assume it is 1.
mem
r a few seconds but having them
for several minutes doesn't work. Any other suggestions to remove them?
Best regards,
Joel Samuelsson
opy, 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:* Joel Samuelsson [mailto:samuelsson.j...@gmail.com]
> *Sent:* Tuesday, April 16, 2013 10:47
> *
bute, 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:* Joel Samuelsson [mailto:samuelsson.j...@gmail.com]
> *Sent:* Tuesday, April 16, 2013 12:52
>
>
> An older discussion about memory use, not that in 1.2 the bloom filters
> (and compression data) are off heap now.
> http://www.mail-archive.com/user@cassandra.apache.org/msg25762.html
>
> Hope that helps.
>
> -
> Aaron Morton
> Freelance Cassandra Consultant
>
> If you are talking about 1.2.x then I also have memory problems on the
idle cluster: java memory constantly slow grows up to limit, then spend
long time for GC. I never seen such behaviour for 1.0.x and 1.1.x, where
on idle cluster java memory stay on the same value.
No I am running Cassandra 1
Just got a very long GC again. What am I to look for in the logging I just
enabled?
2013/6/17 Joel Samuelsson
> > If you are talking about 1.2.x then I also have memory problems on the
> idle cluster: java memory constantly slow grows up to limit, then spend
> long time for GC.
t;
> On Mon, Jun 17, 2013 at 5:51 PM, Joel Samuelsson <
> samuelsson.j...@gmail.com> wrote:
>
>> Just got a very long GC again. What am I to look for in the logging I
>> just enabled?
>>
>>
>> 2013/6/17 Joel Samuelsson
>>
>>> > If you are t
/log/cassandra/gc-`date +%s`.log"
>
>
> At least, no GC logs are shown in your post.
>
>
> On Tue, Jun 18, 2013 at 5:05 PM, Joel Samuelsson <
> samuelsson.j...@gmail.com> wrote:
>
>> Can't find any promotion failure.
>>
>> In system.
My Cassandra ps info:
root 26791 1 0 07:14 ?00:00:00 /usr/bin/jsvc -user
cassandra -home /opt/java/64/jre1.6.0_32/bin/../ -pidfile
/var/run/cassandra.pid -errfile &1 -outfile /var/log/cassandra/output.log
-cp
/usr/share/cassandra/lib/antlr-3.2.jar:/usr/share/cassandra/lib/avro-1.4
c:/var/log/cassandra/gc-1371603607.log
>
> > Is it normal to have two processes like this?
>
> No. You are running two processes.
>
>
> On Wed, Jun 19, 2013 at 4:16 PM, Joel Samuelsson <
> samuelsson.j...@gmail.com> wrote:
>
>> My Cassandra ps info:
>>
>
2013/6/19 Mohit Anchlia
> 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 Cassandr
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