Tolerable amount of CAS queries?

that are only replicated in a single region and I use LOCAL_SERIAL CL would 100 CAS queries per second that in the normal case do not conflict (== work in different partition keys) be sort of 'ok'? Or should it rather be in the range of 10/s? Jan [1] https://www.datastax.com/dev/blog/consensus

Write / read cost of *QUORUM

? - for reads all quorum CLs will yield more requests sent by the coordinator to other nodes and hence *QUORUM reads definitely increase cluster load. (And of course response time of the coordinator, too). Correct? Jan - To unsubscribe, e

Re: How to know when repair repaired something?

misses an event that only later pops up during repair. What that happens, I'd like to re-process the log (my processing is idempotent, so it can just go again). This is why I was looking for a way to learn that a repair has actually repaired something. Jan On Mon, May 29, 2017 at 8:07

How to know when repair repaired something?

Hi, is it possible to extract from repair logs the writetime of the writes that needed to be repaired? I have some processes I would like to re-trigger from a time point if repair found problems. Is that useful? Possible? Jan

Re: Effect of frequent mutations / memtable

. Makes sense? Jan On Fri, May 26, 2017 at 7:41 AM Max C <mc_cassan...@core43.com> wrote: In my case, we're using Cassandra to store QA test data — so the pattern is that we may do a bunch of updates within a few minutes / hours, and then the data will essentially be read-only for th

Re: Effect of frequent mutations / memtable

Hi Jayesh, On 25 May 2017, at 18:31, Thakrar, Jayesh wrote: Hi Jan, I would suggest looking at using Zookeeper for such a usecase. thanks - yes, it is an alternative. Out of curiosity: since both, Zk and C* implement Paxos to enable such kind of thing, why do you think Zookeeper would

Effect of frequent mutations / memtable

happen in the memtable resulting in only occasional manifestation in SSTables. Is that assumption correct and if so, what config parameters should I tweak to keep the memtable from being flushed for longer periods of time? Jan

Re: sstablesplit - status

.8 cluster). Jan - To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org

sstablesplit - status

It seems that sstablesplit cant handle the "new" filename pattern anymore (acutally running 2.2.8 on those nodes). Any hints or other suggestions to split those sstables or get rid of them? Thanks in ad

Re: Read after Write inconsistent at times

Centers and a RF of 3. Has anyone encountered this problem and if yes what steps have you taken to solve it Thanks, Charu -- Jan Kesten, mailto:j.kes...@enercast.de Tel.: +49 561/4739664-0 FAX: -9 Mobil: +49 160 / 90 98 41 68 enercast GmbH Universitätsplatz 12 D-34127 Kassel HRB15471 http

Re: Count(*) is not working

Hi, could you post the output of nodetool cfstats for the table? Cheers, Jan Am 16.02.2017 um 17:00 schrieb Selvam Raman: > I am not getting count as result. Where i keep on getting n number of > results below. > > Read 100 live rows and 1423 tombstone cells for query S

AbstractQueryPager in debug.log

often (about 2500 times a minute) and I was wondering if this is just "ok" or if there is something misusing paged results for requests fetching a single record and we should have a look at it. Maybe paging results could be a performance issue? Thanks for any hints, Jan

Re: Cluster scaling

on seperate disks when using spindles. Third, have you monitored iostats and cpustats while running your tests? Cheers, Jan Am 08.02.2017 um 16:39 schrieb Branislav Janosik -T (bjanosik - AAP3 INC at Cisco): Hi all, I have a cluster of three nodes and would like to ask some questions about

Rust Cassandra Driver?

Hi, I am looking for a driver for the Rust language. I found some projects which seem quite abandoned. Can someone point me to the driver that makes the most sense to look at or help working on? Cheers, Jan

AW: Java GC pauses, reality check

https://www.azul.com/products/zing/order-zing/ At least a list price for zing I found there: 3k$ per year. - Ursprüngliche Nachricht - Von: "Work" Gesendet: ‎26.‎11.‎2016 07:53 An: "user@cassandra.apache.org" Betreff: Re: Java GC pauses,

Re: Hotspots / Load on Cassandra node

Hi, can you check the size of your data directories on that machine to verify in comparison to the others? Have a look for snapshot directories which could still be there from a former table or keyspace. Regards, Jan Am 26. Oktober 2016 06:53:03 MESZ, schrieb Harikrishnan A <h

Re: Thousands of SSTables generated in only one node

2.1.16 or 2.2.8 - as chances are really good your problems will be gone after that. Regards. Jan

Re: Thousands of SSTables generated in only one node

the job - but if you do not need data from one of the keyspaces at all just drop and recreate it (but look into your data directory if there are snapshots left). Prevent this in future have a close look at heap consumption and maybe give it more memory. HTH, Jan

Are updates on map columns causing tombstones?

lead to a delete. Is that correct? Jan

Nodetool Cleanup Problem

)     at org.apache.cassandra.config.Schema.(Schema.java:50)     at org.apache.cassandra.tools.nodetool.Cleanup.execute(Cleanup.java:45)     at org.apache.cassandra.tools.NodeTool$NodeToolCmd.run(NodeTool.java:248)     at org.apache.cassandra.tools.NodeTool.main(NodeTool.java:162) Can anyone help me? Best regards, Jan

enabling Solr on a DSE C* node

HI Folks; I am trying to have one of my DSE 4.7 C* nodes also function as a Solr node within the cluster. I have followed the docs in vain : https://docs.datastax.com/en/datastax_enterprise/4.0/datastax_enterprise/srch/srchInstall.html Any pointers would help. Thanks Jan

Re: When are hints written?

been implemented. Recommend reading up this blog article: http://www.datastax.com/dev/blog/whats-coming-to-cassandra-in-3-0-improved-hint-storage-and-delivery hope this helps Jan/ On Thu, 4/21/16, Jens Rantil <jens.ran...@tink.se> wrote: S

RE: Problem Replacing a Dead Node

is used, the data will stream from the decommissioned node. If removetoken is used, the data will stream from the remaining replicas. Hope this helps Jan/ On Thu, 4/21/16, Anubhav Kale <anubhav.k...@microsoft.com> wrote: Subject: RE: P

Re: Combining two clusters/keyspaces into single cluster

a 'nodetool repair' on cluster 1 d. de-commission cluster2. You are ready to use cluster 1 [with both keyspaces within it] Hope this helps Jan On Thu, 4/21/16, Arlington Albertson <arlingtonalbert...@gmail.com> wrote: Subject: Combini

Re: Alternative approach to setting up new DC

Jens; I am unsure that you need to enable Replication & also use the sstable loader. You could load the data into the new DC and susbsequently alter the keyspace to replicate from the older DC. Cheers Jan On Thu, 4/21/16, Jens Rantil <j

Re: Large primary keys

also take into account to store the keys (hashes) in a seperate table per day / hour or something like that, so you can quickly get all keys for a time range. A query without the partition key may be very slow. Jan Am 11.04.2016 um 23:43 schrieb Robert Wille: I have a need to be able to us

Re: NTP Synchronization Setup Changes

as the gps satellites are flying atom clocks :) Just my 2 cents, Jan Von meinem iPhone gesendet > Am 31.03.2016 um 03:07 schrieb Mukil Kesavan <weirdbluelig...@gmail.com>: > > Hi, > > We run a 3 server cassandra cluster that is initially NTP synced to a single > physical

Thrift composite partition key to cql migration

), column1, column2) ) Cheers, Jan

Re: Cassandra nodes reduce disks per node

them again online, much less files to copy now. After that I shutdown the node and my last rsync now has to copy only a few files which is quite fast and so the downtime for that node is within minutes. Jan Von meinem iPhone gesendet > Am 18.02.2016 um 22:12 schrieb Branton Davis <bran

Re: Forming a cluster of embedded Cassandra instances

needs more understanding and planning. Just as a hint and offtopic: I saw people using cassandra as application glue for interprocess communication where every app server started a node (for communication, sessions and as queue and so on). If that is eventually a use case - have a look at hazelcast.

Re: Sudden disk usage

SizeTieredCompaction you can end up with very huge sstables as I do (>250gb each). In the worst case you could possibly need twice the space - a reason why I set up my monitoring for disk to 45% usage. Just my 2 cents. Jan Von meinem iPhone gesendet > Am 13.02.2016 um 08:48 schrieb Branton Davis <b

flipping ordering of returned query results

                     B   E                    C  F Any input would be much appreciated.  thanks,Jan

Re: compaction throughput

Keep in mind that compaction in LCS can only run 1 compaction per level. Even if it wants to run more compactions in L0 it might be blocked because it is already running a compaction in L0. BR Jan On 01/16/2016 01:26 AM, Sebastian Estevez wrote: LCS is IO ontensive but CPU is also relevant

Cassandra 2015 Summit videos

HI Folks could you please point me to the  2015 Cassandra summit held in California. I do see the ones posted for the 2014 & 2013 conferences.    ThanksJan

Re: Cassandra is consuming a lot of disk space

cassandra.yaml to remove the additional datadir - shutdown the node - rsync again (just for the case, a new sstable got written while the first one was running) - restart HTH Jan Am 14.01.2016 um 08:38 schrieb Rahul Ramesh: > One update. I cleared the snapshot using nodetool clearsnapshot comm

Re: Cassandra is consuming a lot of disk space

consuming your space. Jan Von meinem iPhone gesendet > Am 14.01.2016 um 07:25 schrieb Rahul Ramesh <rr.ii...@gmail.com>: > > Thanks for your suggestion. > > Compaction was happening on one of the large tables. The disk space did not > decrease much after the compactio

ClosedChannelExcption while nodetool repair

crub. Any suggestions what is causing this? Thanks in advance, Jan

LOCAL_SERIAL

the work? So instead of saying 'for this query, LOCAL_SERIAL is enough for me' this would be like saying 'I want XYZ to happen exactly once, per data center'. - All services would try to do XYZ, but only one instance *per datacenter* will actually become the leader and succeed. Makes sense? Jan

Re: How to measure disk space used by a keyspace?

nodetool cfstats would be your best bet.   Sum all the column families info.,  within a keyspace to get to the number you are looking for.  Jan/ On Wednesday, July 1, 2015 9:05 AM, graham sanderson gra...@vast.com wrote: If you are pushing metric data to graphite

Re: Stream failure while adding a new node

David ; bring down all the nodes with the exception of the 'seed' node.Now bring up the 10th node.   Run 'nodetool status'  and wait until this 10th node is UP. Bring up the rest of the nodes after that. Run  'nodetool status'  again and check that all the nodes are UP.  

RE: Read Repair in cassandra

The request would return with the latest data. The read request would fire against node 1 and node 3. The coordinator would get answers from both and would merge the answers and return the latest. Then read repair might run to update node 3. QUORUM does not take into consideration whether an

Re: Cluster status instability

Marcin  ;  are all your nodes within the same Region   ?   If not in the same region,   what is the Snitch type that you are using   ?  Jan/ On Thursday, April 2, 2015 3:28 AM, Michal Michalski michal.michal...@boxever.com wrote: Hey Marcin, Are they actually going up and down

Cassandra time series + Spark

, I have to deal with data all over the place. I can't currently think of anything but performing aggregateByKey causing a shuffle every time. Anyone have experience with combining time series chunking and computation on all / many time series at once? Any advice? Cheers, Frens Jan

Re: Out of Memory Error While Opening SSTables on Startup

Paul Nickerson;  curious, did you get a solution to your problem ?  Regards,Jan/  On Tuesday, February 10, 2015 5:48 PM, Flavien Charlon flavien.char...@gmail.com wrote: I already experienced the same problem (hundreds of thousands of SSTables) with Cassandra 2.1.2. It seems

Re: Logging client ID for YCSB workloads on Cassandra?

HI Jatin;  besides enabling Tracing,   is there any other way to get the task done  ?  (to log the client ID for every operation)Please share with the community the solution, so that we could collectively learn from your experience.  cheersJan/ On Friday, February 20, 2015 12:48 PM,

Re: Cassandra Read Timeout

from the second table ?  Unfortunately,  I have more questions that answers;  however  despite the sacrilege of using super-columns (lol), there has got to be a logical answer to the Performance problem you are having.       Hopefully we could dig in and find an answer .  Jan

Re: best way to measure repair times?

Ian;  to respond to your specific question: You could pipe the output of your repair into a file and subsequently determine the time taken.    example: nodetool repair -dc DC1 [2014-07-24 21:59:55,326] Nothing to repair for keyspace 'system' [2014-07-24 21:59:55,617] Starting repair command #2,

Re: active queries

HI Rahul;  your question: Can we see active queries on cassandra cluster. Is there any tool? Answer:     nodetool tpstats    nodetool  cfsstats  The nodetool tpstats command provides statistics about the number of active, pending, and completed tasks for each stage of Cassandra operations by

Re: Delete columns

Benyi ;  have you considered using the TTL option in case your columns are meant to be deleted after a predetermined amount of time ? Its probably the easiest way to get the task accomplished. cheersJan On Friday, February 27, 2015 10:38 AM, Benyi Wang bewang.t...@gmail.com wrote:

Re: FileNotFoundException

HI Batranut; In both errors you described above the files seem to be missing while compaction is running. Without knowing what else is going on your system,  I would presume that this error occurs on this single node only and not your entire cluster.  Some guesses:a)  You may have a disk

Re: Problems after trying a migration

)  conduct a 'nodetool repair -parallel'  again i) Upgrade to  OpsCenter 5.1   Best of luck,  hope this helps.  Jan/ On Wednesday, March 18, 2015 1:01 PM, Robert Coli rc...@eventbrite.com wrote: On Wed, Mar 18, 2015 at 9:05 AM, David CHARBONNIER david.charbonn...@rgsystem.com wrote

Re: Inconsistent count(*) and distinct results from Cassandra

which yielded much more partition keys, the entire token range did seem to be queried. To reiterate my initial questions: is this behavior to be expected? Am I doing something wrong? Is there a workaround? Best regards, Frens Jan On 4 March 2015 at 22:59, daemeon reiydelle daeme...@gmail.com wrote

Re: Inconsistent count(*) and distinct results from Cassandra

2015 at 18:10, DuyHai Doan doanduy...@gmail.com wrote: First idea to eliminate any issue with regards to staled data: issue the same count query with RF=QUORUM and check whether there are still inconsistencies On Tue, Mar 10, 2015 at 9:13 AM, Rumph, Frens Jan m...@frensjan.nl wrote: Hi Jens

Pointers on deploying snitch for Multi region cluster

 HI Folks;  We are planning to deploy a Multi region C* Cluster with   nodes on both US coasts. Need some advice :  a)  As I do not have Public IP address access,  is there an alternative way to deploy EC2MultiRegion snitch using Private IP addresses ? b)  Has anyone used EC2_Snitch  with nodes

Re: Best way to alert/monitor nodetool status” down.

You could set up an Alert  for Node down within OpsCenter. OpsCenter also offers you the option to send an email to a paging system with reminders.  Jan/ On Sunday, March 8, 2015 6:10 AM, Vasileios Vlachos vasileiosvlac...@gmail.com wrote: We use Nagios for monitoring, and we call

Re: cassandra node jvm stall intermittently

) dropped.  It's strange it only happen in this node but this type of message does not shown in other node log file at the same time...  Jason On Thu, Mar 5, 2015 at 4:26 AM, Jan cne...@yahoo.com wrote: HI Jason;  Whats in the log files at the moment jstat shows 100%. What is the activity

Re: Write timeout under load but Read is fine

Hello Jaydeep; Run cassandra-stress with R/W options enabled  for about the same time and check if you have dropped packets. It would eliminate the client as the source of the error also give you a replicable tool to base subsequent tests/ findings.  Jan/  On Thursday, March 5, 2015

Re: Write timeout under load but Read is fine

HI Jaydeep;  - look at the i/o  on all three nodes - Increase the write_request_timeout_in_ms: 1 - check the time-outs if any on the client inserting the Writes - check the Network for  dropped/lost packets hope this helpsJan/ On Wednesday, March 4,

Re: cassandra node jvm stall intermittently

HI Jason;  Whats in the log files at the moment jstat shows 100%. What is the activity on the cluster the node at the specific point in time (reads/ writes/ joins etc) Jan/ On Wednesday, March 4, 2015 5:59 AM, Jason Wee peich...@gmail.com wrote: Hi, our cassandra node using java 7

Inconsistent count(*) and distinct results from Cassandra

2.1.2 on 64bit fedora 21 with Oracle Java 1.8.0_31. Thanks in advance, Frens Jan

Strange Sizes after 2.1.3 upgrade

, but they have only 3 TB drives. I made a screenshot. https://www.dropbox.com/s/0qhbpm1znwd07rj/strange_sizes.png?dl=0 Did this occur somewhere else? Maybe it is totally unrelated to 2.1.3 upgrade. Thanks for any pointers, Jan

RDD partitions per executor in Cassandra Spark Connector

a repartition is way to expensive as I just want more partitions for parallelism, not reshuffle ... Thanks in advance! Frens Jan

Re: Node stuck in joining the ring

Hi Batranut, apart from the other suggestions - do you have ntp running on all your cluster nodes and are times in sync? Jan

Re: Node joining take a long time

/CASSANDRA-8839 Jan

PySpark and Cassandra integration

full usage of https://github.com/datastax/spark-cassandra-connector and brings much of it's goodness to PySpark! Hope that some of you are able to put this to good use. And feedback, pull requests, etc. are more than welcome! Best regards, Frens Jan

Re: Any problem mounting a keyspace directory in ram memory?

HI Gabriel;  I don't think Apache Cassandra supports in-memory keyspaces. However Datastax Enterprise does support it.  Quoting from Datastax: DataStax Enterprise includes the in-memory option for storing data to and accessing data from memory exclusively. No disk I/O occurs. Consider using the

Re: Unable to create a keyspace

Saurabh;  a)   How exactly are the three nodes hosted.   b)  Can you take down node 2 and  create the keyspace from node 1c) Can you take down node 1 and  create the keyspace from node2d)   Do the nodes see each other with 'nodetool status'   cheersJan/ C* Architect On Saturday, January

Re: Cassandra 2.0.11 with stargate-core read writes are slow

 Pythian - Love your data rolo@pythian | Twitter: cjrolo | Linkedin: linkedin.com/in/carlosjuzarteroloTel: 1649www.pythian.com On Sat, Jan 31, 2015 at 2:49 AM, Asit KAUSHIK asitkaushikno...@gmail.com wrote: Hi all, We are testing our logging application on 3 node cluster each system is virtual

Re: Cassandra on Ceph

Colin;  Ceph is a block based storage architecture based on RADOS.    It comes with its own replication rebalancing along with a map of the storage layer.     Some more details similarities: a)Ceph stores a client’s data as objects within storage pools.   (think of C* partitions)b) Using the

Re: Timeouts but returned consistency level is invalid

HI Michal;  The consistency level defaults to ONE for all write and read operations. However consistency level is also set for the keyspace.  Could it be possible that your queries are spanning multiple keyspaces which bear different levels of consistency ?   cheersJan C* Architect On

Syntax for using JMX term to connect to Cassandra

HI Folks;  I am trying to use JMXterm,  a command line based tool to script monitor C* cluster. Would anyone on this forum know the exact syntax to connect to Cassandra Domain using JMXterm  ?Please give me an example.  I do 'not'   intend to use OpsCenter or any other UI based tool. thanksJan 

Re: Syntax for using JMX term to connect to Cassandra

...@eventbrite.com wrote: On Thu, Jan 29, 2015 at 3:27 PM, Jan cne...@yahoo.com wrote: I am trying to use JMXterm,  a command line based tool to script monitor C* cluster.  Would anyone on this forum know the exact syntax to connect to Cassandra Domain using JMXterm  ? Here's an example from

Re: Opscenter served reads / second

Mbean:    org.apache.cassandra.request  Attribute: org.apache.cassandra.request:type=ReadStage Hope this helpsJan/ On Thursday, January 29, 2015 9:13 AM, Batranut Bogdan batra...@yahoo.com wrote: Hello, Is there a metric that will show how many reads per second C* serves? Read

Re: Syntax for using JMX term to connect to Cassandra

direction. Hope this helpsJan/ On Thursday, January 29, 2015 5:01 PM, Jan cne...@yahoo.com wrote: Thanks Rob;  here is what I am looking for :  java -jar  /home/user/jmxterm-1.0-alpha-4-uber.jar 10.30.41.52:7199 -O org.apache.cassandra.internal:type=FlushWriter -A CurrentlyBlockedTask

Re: Fixtures / CI docker

result, I recommend the following: a)   Keep the 'data' expectation to a point in time which is a known quanta. b)   Load some data into your cluster take a snapshot.    Reload this snapshot before every Test for consistent results.    hope this helps.  Jan/C* Architect On Monday, January 26

Re: How to store weather station Details along with monitoring data efficiently?

include the  Primary clustered keys and it should be fine.  You identify the new row via : Primary clustered keys. Errata:   You could add  Longitude Latitude too to the model to add a level of detail especially since its widely prevalent for weather station data.  hope this helps.  jan

Re: Does nodetool repair stop the node to answer requests ?

Running a  'nodetool repair'  will 'not'  bring the node down.  Your question: does a nodetool repair make the server stop serving requests, or does it just use a lot of ressources but still serves request  Answer:     NO, the server will not stop serving requests.      It will use some

Re: Nodetool clearsnapshot

compaction you will have one active SSTable5 which is newly written and consumes space. The snapshot-linked ones are still there, still consuming their space. Only when this snapshot is cleared you get your disk space back. HTH, Jan

Repair producing validation failed errors regularly

] at java.lang.Thread.run(Thread.java:744) [na:1.7.0_51] BR Jan

Re: Replacing nodes disks

Hi, even if recovery like a dead node would work - backup and restore (like my way with an usb docking station) will be much faster and produce less IO and CPU impact on your cluster. Keep that in Mind :-) Cheers, Jan Am 22.12.2014 um 10:58 schrieb Or Sher: Great. replace_address works

sstablemetadata and sstablerepairedset not working with DSC on Debian

for me on both tools. Jan

Re: Replacing nodes disks

- everything should be fine ;-) Of course you will need a replication factor 1 for this to work ;-) Just my 2 cents, Jan rsync the full contents there, Am 18.12.2014 um 16:17 schrieb Or Sher: Hi all, We have a situation where some of our nodes have smaller disks and we would like to align

Re: Cassandra schema migrator

Hi Jens, maybe you should have a look at mutagen for cassandra: https://github.com/toddfast/mutagen-cassandra It is a litte quiet around this for some months, but maybe still worth it. Cheers, Jan Am 25.11.2014 um 10:22 schrieb Jens Rantil: Hi, Anyone who is using, or could recommend

RE: high context switches

@cassandra.apache.org Subject: Re: high context switches On Fri, Nov 21, 2014 at 1:21 AM, Jan Karlsson jan.karls...@ericsson.commailto:jan.karls...@ericsson.com wrote: Nothing really wrong with that however I would like to understand why these numbers are so high. Have others noticed this behavior? How much

high context switches

Hello, We are running a 3 node cluster with RF=3 and 5 clients in a test environment. The C* settings are mostly default. We noticed quite high context switching during our tests. On 100 000 000 keys/partitions we averaged around 260 000 cs (with a max of 530 000). We were running 12 000~

Re: Exploring Queueing

Hi all, thanks again for the comments. I have created an (improved?) design, this time using dedicated consumers per shard and time-based row expire, hence without immediate deletes. https://github.com/algermissen/cassandra-ruby-sharded-workers As before, comments are welcome. Jan On 06 Oct

Re: Exploring Simply Queueing

- but since performance isn’t our concern, CAS should do fine, I guess(?) Thanks again, Jan --- Chris Lohfink On Oct 5, 2014, at 6:03 PM, Jan Algermissen jan.algermis...@nordsc.com wrote: Hi, I have put together some thoughts on realizing simple queues with Cassandra. https

Re: Exploring Simply Queueing

the job in the queue and another insert to mark the job as done or in process or whatever. This would also give you the benefit of being able to replay the state of the queue. Thanks, I’ll try that, too. Jan On Mon, Oct 6, 2014 at 12:57 AM, Jan Algermissen jan.algermis...@nordsc.com

Re: Exploring Simply Queueing

gc_grace_seconds and that the goal primarily is to keep the rows ‘short’ enough to achieve a tombstones read performance impact that one can live with in a given use case. Is that understanding wrong? Jan

Exploring Simply Queueing

thoughts on the design path I took. Jan [1] https://github.com/Netflix/astyanax/wiki/Message-Queue

Re: Concurrents deletes and updates

with T1 and insert with T1 the delete wins, which was the reason in our case. You might want to test this with client provided timestamps and make sure the insert has a T_insert T_delete Jan Is it a bug on Cassandra or on Datastax driver? Any suggestions? Tks

Re: Scala driver

-scala-cassandra-sample The actual mapping from Java to Scala futures for the async case is in https://github.com/magro/play2-scala-cassandra-sample/blob/master/app/models/Utils.scala HTH, Jan Thanks

Reducing tombstones impact in queue access patterns through rolling shards?

/astyanax/wiki/Message-Queue Has anyone adopted such a pattern and can share experience? Jan

Ordering of schema updates and data modifications

the modification is hitting the database? Alternatively, what do others do to handle schema migrations during continuous delivery processes. Jan

Re: Ordering of schema updates and data modifications

Colin, On 18 May 2014, at 15:29, Colin co...@clark.ws wrote: Hi Jan, Try waiting a period of time, say 60 seconds, after modifying the schema so the changes propagate throughout the cluster. Also, you could add a step to your automation where you verify the schema change by attempting

Re: Ordering of schema updates and data modifications

On 18 May 2014, at 10:30, Jan Algermissen jan.algermis...@nordsc.com wrote: Hi, in our project, we apparently have a problem or misunderstanding of the relationship between schema changes and data updates. One team is doing automated tests during build and deployment that executes

Running Production Cluster at Rackspace

Hi, can anyone point me to recommendations for hosting and configuration requirements when running a Production Cassandra Cluster at Rackspace? Are there reference projects that document the suitability of Rackspace for running a production Cassandra cluster? Jan

repair -pr does not return

node - running a nodetool repair -pr on one of the nodes seems to run forever, right now it's running for 2 complete days and does not return. Any suggestions? Thanks in advance, Jan

Re: repair -pr does not return

the issue. Thanks for that hint! Cheers, Jan

Re: Cassandra Disk storage capacity

. The parameters used for on disk storage are commitlog_directory and data_file_directories and saved_caches_directory. The paramter data_file_directories is in plural, you can easily put more than one directory here (and you should do this instead of using RAID). Cheers, Jan Am 07.04.2014 12:56

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