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138 discussions - 608 posts

  • Hi, I can see some strange behaviour on my test cluster and in production. Both running cassandra 0.8.10. Strange is that when I compile my mapreduce job against cassandra-all 0.8.7 everything is ok, ...
    Patrik ModestoPatrik Modesto
    Feb 24, 2012 at 1:21 pm
    Mar 8, 2012 at 9:07 am
  • Please unsubscribe me. Thanks!
    Larry LiuLarry Liu
    Feb 3, 2012 at 1:51 pm
    Feb 20, 2012 at 11:57 pm
  • Hi, I'm using Cassandra 1.0.7 and I've set the keys_cached to about 80% (using the numerical values). This is visible in cfstats too. But I'm getting less than 20% (or sometimes even 0%) key cache ...
    Eran Chinthaka WithanaEran Chinthaka Withana
    Feb 14, 2012 at 4:55 pm
    Feb 17, 2012 at 11:18 pm
  • Hi, I am testing Cassandra on Amazon and finding performance can vary fairly wildly. I'm leaning towards it being an artifact of the AWS I/O system but have one other possibility. Are keycaches ...
    Franc CarterFranc Carter
    Feb 13, 2012 at 5:53 am
    Feb 13, 2012 at 9:30 am
  • I've been testing Cassandra - primarily looking at reads/second for our fairly data model - one unique key with a row of columns that we always request. I've now setup the cluster with with m1.large ...
    Franc CarterFranc Carter
    Feb 19, 2012 at 10:24 am
    Feb 28, 2012 at 12:37 am
  • Hi, We are getting close to replacing our super-column based schema to something more efficient, and I am trying to wrap my heads around composite columns. An email from another list member has ...
    Yiming SunYiming Sun
    Feb 3, 2012 at 9:22 pm
    Feb 6, 2012 at 6:30 pm
  • I just installed Cassandra on my ubuntu server by adding the following to the sources list: deb http://www.apache.org/dist/cassandra/debian 10x main deb-src ...
    Aditya GuptaAditya Gupta
    Feb 18, 2012 at 11:41 am
    Feb 20, 2012 at 5:34 pm
  • Hi All I have 2 Cassandra data center (DC1= 1 node, DC2= 2 nodes). XXX.XXX.XXX.XXX DC2 RAC1 Up Normal 44.3 KB 33.33% 0 YYY.YYY.YY.YYY DC1 RAC1 Up Normal 48.71 KB 33.33% ...
    Feb 9, 2012 at 3:05 am
    Feb 10, 2012 at 12:50 am
  • Hi, I have a 3 node cluster and I'm dynamically updating a keyspace with a new column family. Then, when I try to write records to it I get the following exception shown at [1]. How do I avoid this ...
    Tharindu MathewTharindu Mathew
    Feb 29, 2012 at 2:26 pm
    Mar 7, 2012 at 6:04 pm
  • Hi I'm creating an networking site using cassandra. I am wanting to host this application but initially with the lowest possible resources & then slowly increasing the resources as per the service's ...
    Ertio LewErtio Lew
    Feb 27, 2012 at 7:18 pm
    Mar 1, 2012 at 12:35 pm
  • I recently started using Cassandra 1.0.4 and observed that it takes a lot longer to flush the commit logs to SSTables, than was observed in versions 0.7.X and 0.8.X under constant load conditions ...
    Xaero SXaero S
    Feb 24, 2012 at 12:06 am
    Feb 29, 2012 at 12:10 am
  • Hi, we have developed a software that store logs from mail servers in MySQL, but for huge enviroments we are developing a version that store this data in HBase. Raw logs are, once a day, first ...
    Alessio CecchiAlessio Cecchi
    Feb 17, 2012 at 12:43 pm
    Feb 20, 2012 at 7:16 am
  • While creating a multinode cluster, my nodes are unable to identify all the nodes in the cluster. Only the *last added' node is visible when I do: ./nodetool -h localhost ring I am trying to create a ...
    Aditya GuptaAditya Gupta
    Feb 25, 2012 at 3:49 pm
    Feb 26, 2012 at 5:37 am
  • my design calls for deleting a row (by key, not individual columns) and re-inserting it a lot and I'm concerned about tombstone build up slowing down reads. I know if I delete a lot of individual ...
    Todd BurrussTodd Burruss
    Feb 14, 2012 at 7:54 pm
    Feb 17, 2012 at 1:56 pm
  • all, could somebody clue me to why the below code doesn't work. my schema is; create column family StockHistory with comparator = 'CompositeType(LongType,UTF8Type)' and default_validation_class = ...
    Deno VichasDeno Vichas
    Feb 10, 2012 at 10:00 am
    Feb 17, 2012 at 7:27 am
  • Hi I have 2 node Cassandra cluster and each linux box configured with a firewall. The ports 7000, 7199 and 9160 are open in the firewall and I can telnet to the ports from both ends without any ...
    Feb 6, 2012 at 1:35 am
    Feb 8, 2012 at 5:32 pm
  • Hi All, We are running a 3-node cluster with Cassandra 0.6.13. We are in the process of upgrading to 1.x, but can't do so for a while because we can't take the cluster offline. Until now 0.6.13 has ...
    Stefan ReekStefan Reek
    Feb 28, 2012 at 9:50 am
    Mar 5, 2012 at 9:07 am
  • Hi! I have a column family where I use rows as "time buckets". What I do is take epoc time in seconds, and round it to 1 hour (taking the result of time_since_epoc_second divided by 3600). My key ...
    Tamar FraenkelTamar Fraenkel
    Feb 28, 2012 at 6:25 am
    Feb 28, 2012 at 3:48 pm
  • Hi, I've finished my first model and experiments with Cassandra with result I'm pretty happy with - so I thought I'd move on to something harder. We have a set of data that has a large number of ...
    Franc CarterFranc Carter
    Feb 24, 2012 at 2:37 am
    Feb 24, 2012 at 4:51 pm
  • Hi, 1 - I would like to generate some statistics and store some raw events from log files tailed with flume. I saw some plugins giving Cassandra sinks but I would like to store data in a custom way, ...
    Feb 9, 2012 at 3:28 pm
    Feb 23, 2012 at 4:23 pm
  • I am about to choose a linux distro to be installed on Cassandra nodes. Which are the most popular & recommended ones by Cassandra community? (Not interested in paying licensing fees)
    Aditya GuptaAditya Gupta
    Feb 21, 2012 at 11:11 am
    Feb 22, 2012 at 8:25 am
  • Hi, I've a strange problem with my test cluster. Calling truncate on a small ColumnFamily on idle cluster of 4 nodes returns UnavailableException after 10s. That 10s is set in rpc_timeout_in_ms. All ...
    Patrik ModestoPatrik Modesto
    Feb 7, 2012 at 8:18 am
    Feb 10, 2012 at 5:12 pm
  • Hey guys, I am getting an out of memory (mmap failed) error with Cassandra 1.0.2. The relevant log lines are pasted at http://pastebin.com/UM28ZC1g. Cassandra works fine until it reaches about ...
    Ajeet GrewalAjeet Grewal
    Feb 4, 2012 at 1:28 am
    Feb 8, 2012 at 1:32 am
  • Hi, I'm pretty new to Cassandra and am currently doing a proof of concept, and thought it would be a good idea to ask if my data model is sane . . . The data I have, and need to query, is reasonably ...
    Franc CarterFranc Carter
    Feb 4, 2012 at 11:13 am
    Feb 7, 2012 at 9:06 pm
  • We noticed that nodetool ring sometimes returns in 17-20 sec while it normally runs in less than a sec. There were some compaction running when it happened. Did compaction cause nodetool slowness? ...
    Feng QuFeng Qu
    Feb 22, 2012 at 9:50 pm
    Mar 30, 2012 at 11:48 pm
  • I recently had to do some shuffling with one of my cassandra nodes because it was running out of disk space. I did a few things in the process, and I'm not sure in the end which caused my problem ...
    Casey DeccioCasey Deccio
    Feb 29, 2012 at 1:26 pm
    Mar 5, 2012 at 9:35 am
  • Hi there, I'm currently busy with the technical design of a new project. Of course it will depend on your needs, but is it weird to combine Cassandra with a SQL language like MySQL? In my usecase it ...
    R. VerlangenR. Verlangen
    Feb 26, 2012 at 1:06 pm
    Mar 1, 2012 at 10:16 pm
  • I have not found any examples of utilizing a CompositeType of DynamicCompositeType as a row key. Is doing this frowned upon? All the examples I've seen have been using a CompositeType only for Column ...
    Philip ShonPhilip Shon
    Feb 28, 2012 at 4:26 pm
    Feb 29, 2012 at 9:19 pm
  • Hi Experts, My program is such that it queries all keys on Cassandra. I want to do this as quick as possible, in order to get as close to real-time as possible. One solution I heard was to use the ...
    Martin ArrowsmithMartin Arrowsmith
    Feb 13, 2012 at 10:01 pm
    Feb 26, 2012 at 8:11 pm
  • Hi everyone, what do I use in order to insert bytes instead of characters into a column, using CQL with the Thrift-client?
    Montgomery BurnsMontgomery Burns
    Feb 24, 2012 at 3:28 pm
    Feb 24, 2012 at 8:54 pm
  • I am running 1.0.2 with the default tiered compaction. After running a "nodetool compact", I noticed that on about half of the machines in my cluster, both "nodetool ring" and "nodetool info" report ...
    Bill AuBill Au
    Feb 16, 2012 at 2:27 pm
    Feb 23, 2012 at 11:34 pm
  • I need to iterate over all the rows in a column family stored with RandomPartitioner. When I reach the end of a key slice, I need to find the token of the last key in order to ask for the next ...
    Flavio BarontiFlavio Baronti
    Feb 22, 2012 at 9:49 am
    Feb 22, 2012 at 2:47 pm
  • Hello, How to find the right commit SHA for specific cassandra release? For example, how to checkout 0.8.9 release on git repository? With git log --grep=0.8.9, I found the latest commit mentioned ...
    Maki WatanabeMaki Watanabe
    Feb 13, 2012 at 3:40 am
    Feb 13, 2012 at 5:12 am
  • I have a cassandra setup with 7 Node Ring single DC with RF:7 and Read:CL:1.There is live traffic on these nodes except one - the traffic is 90% read. There are also writes happening to all these ...
    Shubham SrivastavaShubham Srivastava
    Feb 4, 2012 at 4:59 am
    Feb 8, 2012 at 10:26 am
  • how does read repair work in the following scenario? i have RF=3, my row/column lives on 3 nodes right? if (for some reason, eg a timed-out write at quorum) node 1 has a 'new' version of the ...
    Guy IncognitoGuy Incognito
    Feb 1, 2012 at 8:33 pm
    Feb 5, 2012 at 3:57 am
  • Are there any good resources for best practices when running Cassandra within EC2? I'm particularly interested in the security issues, when the servers communicating w/ Cassandra are outside of EC2 ...
    Philip ShonPhilip Shon
    Feb 23, 2012 at 2:47 pm
    Apr 30, 2012 at 3:22 am
  • Hi all I am running the Apache packaged Cassandra 1.0.7 on Ubuntu 11.10. It has been running fine for over a month however I encountered the below error yesterday which almost immediately resulted in ...
    Thomas van NeerijnenThomas van Neerijnen
    Feb 20, 2012 at 11:43 am
    Mar 7, 2012 at 6:24 pm
  • Hi, I am using cassandra0.8.6 for saving inverted indexes through Solr(Solr3.3 + Cassandra). I am having problem while doing writes which causes lot of GC activity where CPU usage increases + heap ...
    Shubham SrivastavaShubham Srivastava
    Feb 21, 2012 at 9:40 am
    Mar 5, 2012 at 10:13 am
  • Hello everyone, I'm battling with this contraint that I have: I need to regularly ship out timeseries data from a Cassandra cluster that sits within an enclosed network, outside of the network. I ...
    Alexandru SicoeAlexandru Sicoe
    Feb 24, 2012 at 2:22 pm
    Mar 2, 2012 at 9:21 am
  • Hi, does anyone know of a picture/image that shows the layout of keys/columns/values in an sstable - I haven't been able to find one and am having a hard time visualising the layout from various ...
    Franc CarterFranc Carter
    Feb 28, 2012 at 7:08 am
    Feb 28, 2012 at 10:02 am
  • I am using CompositeType columns and its very convenient to query for a range of columns using the *First N *components but how do I delete a range of columns using the First N components of the ...
    Praveen BaratamPraveen Baratam
    Feb 22, 2012 at 11:18 pm
    Feb 26, 2012 at 7:28 pm
  • Hello I have installed CQL drivers for python. When I try execute cqlsh I get following error cql-1.0.3$ cqlsh localhost 9160 Traceback (most recent call last): File "/usr/local/bin/cqlsh", line 33, ...
    Rishabh AgrawalRishabh Agrawal
    Feb 22, 2012 at 6:19 am
    Feb 22, 2012 at 4:01 pm
  • Hello experts, Based on this blog of Basic Time Series with Cassandra data modeling, http://rubyscale.com/blog/2011/03/06/basic-time-series-with-cassandra/ "This (wide row column slicing) works well ...
    Data CraftsmanData Craftsman
    Feb 15, 2012 at 6:40 pm
    Feb 20, 2012 at 12:33 am
  • Hi there, As the subject states: "Is it possible to set a replication factor per column family?" Could not find anything of recent releases. I'm running Cassandra 1.0.7 and I think it should be ...
    R. VerlangenR. Verlangen
    Feb 16, 2012 at 8:55 am
    Feb 17, 2012 at 2:11 pm
  • Hi all, I'm using the Hector client 0.8, trying to retrieve a list of IDs from a gaint row. each ID is a columnName in the row It works ok when there's not many IDs, but SliceQuery starts to time-out ...
    Yuhan ZhangYuhan Zhang
    Feb 14, 2012 at 8:15 pm
    Feb 14, 2012 at 11:06 pm
  • I teminated (ec2 destruction) a node that I was wedged during bootstrap. However when I try to removetoken I get 'Token not found'. It looks a bit like this issue ? ...
    Franc CarterFranc Carter
    Feb 14, 2012 at 9:45 pm
    Feb 14, 2012 at 10:30 pm
  • The Cassandra team is pleased to announce the release of Apache Cassandra version 0.8.10. Cassandra is a highly scalable second-generation distributed database, bringing together Dynamo's fully ...
    Sylvain LebresneSylvain Lebresne
    Feb 13, 2012 at 10:40 am
    Feb 14, 2012 at 5:48 pm
  • Hi, I've been looking at tpstats as various test queries run and I noticed something I don't understand. I have a two node cluster with RF=2 on which I run 4 parallel queries, each job goes through a ...
    Franc CarterFranc Carter
    Feb 13, 2012 at 11:48 am
    Feb 14, 2012 at 12:18 pm
  • Hi I have deployed Cassandra 1.0.6 to a 2 data center and one data center (DC1) having one node and the other data center (DC2) having two nodes. But when I do a nodetool ring using one IP, the ...
    Feb 13, 2012 at 1:43 am
    Feb 13, 2012 at 2:53 am
  • If every node in the cluster is running major compaction, would it be able to answer any read request? And is it wise to write anything to a cluster while it's doing major compaction? -- View this ...
    Feb 3, 2012 at 7:20 am
    Feb 4, 2012 at 3:19 am
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147 users for February 2012

Aaron morton: 83 posts Franc Carter: 34 posts R. Verlangen: 28 posts Jonathan Ellis: 24 posts Peter Schuller: 22 posts Roshan Pradeep: 19 posts Aditya Gupta: 17 posts Watanabe Maki: 11 posts Patrik Modesto: 10 posts Todd Burruss: 10 posts Eran Chinthaka Withana: 9 posts Mohit Anchlia: 9 posts Brandon Williams: 8 posts Dave Brosius: 8 posts Edward Capriolo: 8 posts Eric Evans: 8 posts Sylvain Lebresne: 8 posts Deno Vichas: 7 posts Mr.Quintero: 7 posts Yiming Sun: 7 posts
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