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168 discussions - 712 posts

  • Hello, I'm investigating the transition of some of our column families from Size Tiered - Leveled Compaction. I believe we have some high-read-load column families that would benefit tremendously ...
    Feb 13, 2013 at 3:50 pm
    Mar 26, 2013 at 9:45 am
  • So I found out mongodb varies their node size from 1T to 42T per node depending on the profile. So if I was going to be writing a lot but rarely changing rows, could I also use cassandra with a per ...
    Hiller, DeanHiller, Dean
    Feb 15, 2013 at 8:06 pm
    Feb 21, 2013 at 11:26 pm
  • The Datastax docs repeatedly say (e.g. http://www.datastax.com/docs/1.2/install/install_jre) that Java 7 is not recommended, but they don't say why. It would be helpful to know this. Does anyone ...
    Baron SchwartzBaron Schwartz
    Feb 5, 2013 at 3:22 pm
    Apr 5, 2013 at 5:51 am
  • 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 ...
    Daning WangDaning Wang
    Feb 2, 2013 at 9:46 pm
    Feb 16, 2013 at 4:27 am
  • Hello, New member here, and I have (yet another) question on write performance. I'm using Apache Cassandra version 1.1, Python 2.7 and Pycassa 1.7. I have a cluster of 2 datacenters, each with 3 ...
    Feb 13, 2013 at 1:50 pm
    Feb 14, 2013 at 4:22 pm
  • So I have three nodes in a ring in one data center. My configuration has num_tokens: 256 set and initial_token commented out. When I look at the ring, it shows me all of the token ranges of course, ...
    Stephen M ThompsonStephen M Thompson
    Feb 5, 2013 at 7:41 pm
    Feb 13, 2013 at 8:42 am
  • Hi, Has anyone used Netflix/astynax java client library for Cassandra? I have used Hector before and would like to evaluate astynax. Not sure, how it is accepted in Cassandra community. Any issues ...
    Cassa LCassa L
    Feb 7, 2013 at 6:14 am
    Feb 10, 2013 at 7:17 pm
  • Hi C* users, I just upgrade a 12 node test cluster from 1.1.6 to 1.2.1. What I noticed from nodetool ring was that the new upgraded nodes only saw each other as Normal and the rest of the cluster ...
    Arya GoudarziArya Goudarzi
    Feb 23, 2013 at 8:26 am
    Apr 3, 2013 at 5:13 am
  • So in the cli, I ran update column family nreldata with bloom_filter_fp_chance=1.0; Then I ran nodetool upgradesstables databus5 nreldata; But my bloom filter size is still around 2gig(and I want to ...
    Hiller, DeanHiller, Dean
    Feb 22, 2013 at 3:36 pm
    Feb 28, 2013 at 7:06 pm
  • Hi - I am doing a load test using YCSB across 2 nodes in a cluster and seeing a lot of mutation dropped messages. I understand that this is due to the replica not being written to the other node ? RF ...
    Kanwar SanghaKanwar Sangha
    Feb 14, 2013 at 2:08 pm
    Feb 25, 2013 at 2:14 am
  • I've configured 2-node cluster in EC2, key settings as follows: cluster_name: 'TS' num_tokens: 256 seed_provider: - class_name: org.apache.cassandra.locator.SimpleSeedProvider parameters: - seeds ...
    Boris SolovyovBoris Solovyov
    Feb 12, 2013 at 7:56 pm
    Feb 18, 2013 at 2:56 pm
  • Hi - Is it a good idea to use Cassandra with SAN ? Say a SAN which provides me 8 Petabytes of storage. Would I not be I/O bound irrespective of the no of Cassandra machines and scaling by adding ...
    Kanwar SanghaKanwar Sangha
    Feb 21, 2013 at 10:57 pm
    Feb 22, 2013 at 6:24 am
  • Are there any documentation/examples available for DataStax java-driver besides what's in the GitHub repo? -- Drew
    Drew KutcharianDrew Kutcharian
    Feb 13, 2013 at 2:20 am
    Feb 13, 2013 at 10:10 pm
  • Hi, I am trying to benchmark cassandra on a 12 Data Node cluster using 16 clients ( each client uses 32 threads) using custom pycassa client and YCSB. I found the maximum number of operations/seconds ...
    Pradeep Kumar ManthaPradeep Kumar Mantha
    Feb 1, 2013 at 12:26 am
    Feb 6, 2013 at 1:16 pm
  • I am facing problem while trying to run cqlsh. Here is what I did: 1. I brought the tar ball files for both 1.1.7 and 1.2.0 version. 2. Unzipped and untarred it 3. Started Cassandra 4. And then tried ...
    Kumar, AnjaniKumar, Anjani
    Feb 4, 2013 at 3:38 pm
    Feb 4, 2013 at 9:25 pm
  • Hey list, Any ideas ( before I take a heap dump ) what might be consuming my 8GB JVM heap at startup in Cassandra 1.1.6 besides * row cache : not persisted and is at 0 keys when this warning is ...
    Andras SzerdahelyiAndras Szerdahelyi
    Feb 20, 2013 at 10:27 am
    Feb 28, 2013 at 9:03 pm
  • My data needs only require me to store JSON, and I can handle this in 1 column family by prefixing row keys with a type, for example: comments:{message_id} Where comments: represents the prefix and ...
    Adam VenturellaAdam Venturella
    Feb 20, 2013 at 6:44 pm
    Feb 26, 2013 at 6:15 pm
  • -- Rudy Jahchan
    Rudy JahchanRudy Jahchan
    Feb 8, 2013 at 7:00 pm
    Feb 22, 2013 at 2:07 am
  • Hi, Does anyone use CDH4's Hadoop with Cassandra to interact? The goal is simply read/write to Cassandra from Hadoop direclty using ColumnFamilyInput(Output)Format, but seems a bit compatibility ...
    Yang SongYang Song
    Feb 16, 2013 at 3:06 am
    Feb 16, 2013 at 5:25 pm
  • Hi - We are designing a Cassandra based storage for the following use cases- * Store SMS messages * Store MMS messages * Store Chat history What would be the ideal was to design the data model for ...
    Kanwar SanghaKanwar Sangha
    Feb 6, 2013 at 1:40 am
    Feb 8, 2013 at 2:18 am
  • After figuring out how to use the " " operator on an secondary index I noticed that in a column family of about 5.5 million datasets I get a rpc_timeout when trying to read data from this table. In ...
    Paul van HovenPaul van Hoven
    Feb 3, 2013 at 2:43 pm
    Feb 4, 2013 at 6:31 am
  • Isn't it true if I have 6 nodes, I could run nodetool repair on just 2 nodes(RF=3) instead of using nodetool repair –pr??? What is the advantage of –pr then? I mean a repair involves all three nodes ...
    Hiller, DeanHiller, Dean
    Feb 28, 2013 at 10:39 pm
    Mar 2, 2013 at 8:44 pm
  • Hi All, I have just started to use virtual nodes. I set the number of nodes to 256 as recommended. The problem that I have is when I run a mapreduce job it creates node * 256 mappers. It creates node ...
    Feb 15, 2013 at 4:53 pm
    Feb 17, 2013 at 1:35 pm
  • Hi, I have a cluster of 5 nodes running Cassandra 1.2.0 . I have a Java client with Astyanax 1.56.21. When a node( - *diiferent* from the one in the stacktrace below) went down I get ...
    Traian FrateanTraian Fratean
    Feb 13, 2013 at 1:57 pm
    Feb 14, 2013 at 8:36 pm
  • Hello list! I have application with following characteristics: - data is time series, tens of millions of series at 1-sec granularity, like stock ticker data - values are timestamp, integer (uint64) ...
    Boris SolovyovBoris Solovyov
    Feb 12, 2013 at 10:56 am
    Feb 12, 2013 at 10:42 pm
  • My script to upgrade our first node in QA is thus (basically, snapshot, drain, stop, then switch over then start)… #!/bin/bash export NODE=$1 export VERSION=1.1.4 export USER=cassandra #NOTE: This ...
    Hiller, DeanHiller, Dean
    Feb 27, 2013 at 6:55 pm
    Mar 5, 2013 at 9:01 pm
  • Hello, I am using cassandra 1.2.1 and I am trying to set up a Priam cluster on AWS with two nodes. However, I can't get both nodes up and running because of a weird error (at least to me). When I ...
    Marcelo Elias Del ValleMarcelo Elias Del Valle
    Feb 26, 2013 at 7:10 pm
    Mar 4, 2013 at 1:24 am
  • Title says it all. Anyone know? Thanks, Dean
    Hiller, DeanHiller, Dean
    Feb 28, 2013 at 7:24 pm
    Mar 1, 2013 at 2:45 am
  • Hi, How does Cassandra handle NULL values? I want to know how I can see rows where a certain column has no values. For example if I set the TTL for columns is it possible to select rows where the ttl ...
    Sloot, Hans-PeterSloot, Hans-Peter
    Feb 27, 2013 at 8:34 am
    Feb 27, 2013 at 11:56 am
  • I need to offer my profound thanks to this community which has been so helpful in trying to figure this system out. I've setup a simple ring with two nodes and I'm trying to insert data to them. I ...
    Stephen M ThompsonStephen M Thompson
    Feb 1, 2013 at 9:58 pm
    Feb 4, 2013 at 6:58 pm
  • Hi all, I have a column family with some data + timestamp values and I want to query the column family to fetch data within a timestamp range. AFAIK it is not better to use secondary index for ...
    Kasun WerangaKasun Weranga
    Feb 28, 2013 at 10:50 pm
    Mar 5, 2013 at 4:11 pm
  • Hello, We are using Cassandra 1.2.0. We have a cluster of 16 physical nodes, each node has 256 virtual nodes. We want to add 2 new nodes in our cluster : we follow the procedure as explained here ...
    Jean-Armel LuceJean-Armel Luce
    Feb 21, 2013 at 2:45 pm
    Feb 28, 2013 at 8:36 am
  • Hi - I am doing a performance run using modified YCSB client and was able to populate 8TB on a node and then ran some read workloads. I am seeing an average TPS of 930 ops/sec for random reads. There ...
    Kanwar SanghaKanwar Sangha
    Feb 26, 2013 at 3:32 am
    Feb 26, 2013 at 3:49 pm
  • What does the it mean that each node owns effective 100% of cluster? Both nodes report same output. [ec2-user@ip-10-152-162-228 ~]$ nodetool status Datacenter: us-east =================== ...
    Boris SolovyovBoris Solovyov
    Feb 18, 2013 at 5:55 pm
    Feb 18, 2013 at 7:47 pm
  • Like articles with tests and conclusions about it, and such, and not like the documentation in DataStax, or the Cassandra Books. Thank you.
    Feb 16, 2013 at 6:41 pm
    Feb 17, 2013 at 8:17 pm
  • Hi, I would like to know if there is a way to delete old/unused data easily ? I know about TTL but there are 2 limitations of TTL: - AFAIK, there is no TTL on counter columns - TTL need to be defined ...
    Feb 11, 2013 at 3:22 pm
    Feb 17, 2013 at 8:12 pm
  • Hi, I would like to get some advice on how to model columnfamilies for storing log of firewalls. The columns are listed further below. All the possibilities confuse me a bit (super columns, secondary ...
    Sloot, Hans-PeterSloot, Hans-Peter
    Feb 27, 2013 at 6:02 pm
    Feb 28, 2013 at 8:01 am
  • Hi - Can someone explain the worst case IOPS for a read ? No key cache, No row cache, sampling rate say 512. 1) Bloom filter will be checked to see existence of key (In RAM) 2) Index filer sample (IN ...
    Kanwar SanghaKanwar Sangha
    Feb 21, 2013 at 5:52 am
    Feb 22, 2013 at 4:37 pm
  • Hey, Version 1.1 of Cassandra introduced live traffic sampling, which allows you to measure the performance of a node without it really joining the cluster ...
    Henrik SchröderHenrik Schröder
    Feb 19, 2013 at 1:57 pm
    Feb 21, 2013 at 2:46 pm
  • Hello, I have a cluster with 3 nodes, all of them configured as seeds and with correct listen_addess. If I run nodetool ring on any of the nodes, it seems ok: *$ nodetool ring* *Address DC Rack ...
    Marcelo Elias Del ValleMarcelo Elias Del Valle
    Feb 20, 2013 at 3:40 am
    Feb 20, 2013 at 2:57 pm
  • Hi, We looking for solution for same problem. We have a wide column family with counters and we want to delete old data like 1 months old. One of potential ideas was to implement hook in compaction ...
    Ilya GrebnovIlya Grebnov
    Feb 13, 2013 at 10:09 am
    Feb 18, 2013 at 10:54 pm
  • Hi All, I am newbie to Cassandra and trying to run an example program "ClientOnlyExample" taken from ...
    Jain RahulJain Rahul
    Feb 17, 2013 at 4:42 am
    Feb 18, 2013 at 8:32 pm
  • Hi Guys, Has anyone on this mailing list tried to build a bounding box style (get the records inside a known bounding box) geospatial search? I've been researching this a bit and seems like the only ...
    Drew KutcharianDrew Kutcharian
    Feb 14, 2013 at 1:43 am
    Feb 18, 2013 at 2:42 pm
  • I see people refer to C* and I assume it mean Cassandra, but just wanted to check for sure. In case it is somethings else and I miss it :) Do I right understand?
    Boris SolovyovBoris Solovyov
    Feb 8, 2013 at 4:43 pm
    Feb 17, 2013 at 9:46 pm
  • Hi, recently we are hitting some OOM: Java heap space, so I was investigating how the heap is used in Cassandra 1.2+ We use the calculated 4G heap. Our cluster is 6 nodes, around 750 GB data and a ...
    Reik SchatzReik Schatz
    Feb 15, 2013 at 9:06 am
    Feb 15, 2013 at 6:38 pm
  • Hey Guys, Is the new atomic batch feature in Cassandra 1.2 available via the thrift API? If so, how can I use it? -- Drew
    Drew KutcharianDrew Kutcharian
    Feb 12, 2013 at 3:45 am
    Feb 12, 2013 at 6:42 pm
  • Hey Guys, Are there any specific operational considerations one should make when using counter columns families? How are counter column families stored on disk? How do they effect compaction? -- Drew
    Drew KutcharianDrew Kutcharian
    Feb 5, 2013 at 6:47 pm
    Feb 12, 2013 at 4:23 am
  • Repair reads the data and computes a hash, this is a CPU intensive operation. Is the CPU over loaded or is just under load? That will remove throttling on compaction and the validation compaction ...
    Aaron MortonAaron Morton
    Feb 10, 2013 at 8:05 pm
    Feb 11, 2013 at 9:41 am
  • As I understand the num_tokens setting, it makes Cassandra do the following pseudocode when a new node is added: for 1...num_tokens do my_token = rand(0, 2^128-1) next_token = min(tokens in cluster ...
    Baron SchwartzBaron Schwartz
    Feb 5, 2013 at 4:44 pm
    Feb 5, 2013 at 11:21 pm
  • Hi I am just wondering... Wouldn't it always be worth it to use LCS on counter CF since LCS is optimized for reads and that writing a counter always require a read ? Alain
    Feb 25, 2013 at 3:10 pm
    Mar 5, 2013 at 4:55 pm
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145 users for February 2013

Aaron Morton: 121 posts Hiller, Dean: 52 posts Edward Capriolo: 44 posts Michael Kjellman: 28 posts Alain RODRIGUEZ: 27 posts Kanwar Sangha: 23 posts Boris Solovyov: 21 posts Drew Kutcharian: 13 posts Wei Zhu: 13 posts Mike: 12 posts Sloot, Hans-Peter: 10 posts Manu Zhang: 9 posts Marcelo Elias Del Valle: 9 posts Víctor Hugo Oliveira Molinar: 9 posts Stephen M Thompson: 8 posts S C: 8 posts Bryan Talbot: 7 posts Eric Evans: 7 posts Ken Adey: 7 posts Tyler Hobbs: 7 posts
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