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149 discussions - 755 posts

  • Hi! I created Amazon ring using datastax image and started filling the db. The cluster seems un-balanced. nodetool ring returns: Address DC Rack Status State Load Owns Token ...
    Tamar FraenkelTamar Fraenkel
    Mar 26, 2012 at 2:08 pm
    Oct 12, 2012 at 12:56 am
  • hey all, I have a new cassandra node that I've setup so that I can get better acquainted with this technology. Thus far I've been using the cassandra-cli and it'd been a fun experience so far ...
    Tim DunphyTim Dunphy
    Mar 29, 2012 at 5:53 pm
    Apr 6, 2012 at 4:15 am
  • Hi, We recently moved from 0.8.2 to 1.0.8 and the behaviour seems to have changed so that tombstones are now not being deleted. Our application continually adds and removes columns from Cassandra. We ...
    Ross BlackRoss Black
    Mar 22, 2012 at 1:38 am
    Apr 4, 2012 at 10:23 am
  • I have a profile column family and want to store a list of skills in each profile. In BigTable I could store a Protocol Buffer<http://code.google.com/apis/protocolbuffers/docs/overview.html with a ...
    Ben McCannBen McCann
    Mar 26, 2012 at 7:05 am
    Mar 28, 2012 at 8:28 am
  • The Cassandra team is pleased to announce the release of the second beta for the future Apache Cassandra 1.1. Note that this is beta software and as such is *not* ready for production use. The goal ...
    Sylvain LebresneSylvain Lebresne
    Mar 27, 2012 at 9:55 am
    Apr 2, 2012 at 9:46 pm
  • Can u give an example of create column family with counter column in it. Please reply Regards, Puneet Loya
    Puneet loyaPuneet loya
    Mar 27, 2012 at 12:01 pm
    Apr 18, 2012 at 1:37 pm
  • Hi all, When I try the join command I have the following error : Exception in thread "main" java.lang.RuntimeException: No other nodes seen! Unable to bootstrap.If you intended to start a single-node ...
    Cyril ScetbonCyril Scetbon
    Mar 10, 2012 at 8:59 pm
    Mar 20, 2012 at 1:40 pm
  • I'm having difficulties with leveled compaction, it's not making fast enough progress. I'm on a quad-core box and it only does one compaction at a time. Cassandra version: 1.0.6. Here's nodetool ...
    Thorsten von EickenThorsten von Eicken
    Mar 12, 2012 at 3:05 am
    Mar 14, 2012 at 4:03 am
  • Hi! I have a Cassandra cluster with two nodes nodetool ring -h localhost Address DC Rack Status State Load Owns Token 85070591730234615865843651857942052864 10.0.0.19 datacenter1 rack1 Up Normal ...
    Tamar FraenkelTamar Fraenkel
    Mar 5, 2012 at 10:07 am
    Mar 13, 2012 at 9:13 am
  • I think I have cassandra the server started In another window: Starting Cassandra Client Connected to: "Test Cluster" on localhost/9160 Welcome to Cassandra CLI version 1.0.8 Type 'help;' or '?' for ...
    Frank HsuehFrank Hsueh
    Mar 26, 2012 at 9:21 pm
    Apr 4, 2012 at 10:03 pm
  • Hi, We are trying to estimate the amount of storage we need for a production cassandra cluster. While I was doing the calculation, I noticed a very dramatic difference in terms of storage space used ...
    Yiming SunYiming Sun
    Mar 28, 2012 at 8:41 pm
    Apr 6, 2012 at 8:46 pm
  • I suspect that running cluster wide repair interferes with TTL based expiration. I am running repair every 7 days and using TTL expiration time 7 days too. Data are never deleted. Stored data in ...
    Radim KolarRadim Kolar
    Mar 19, 2012 at 10:17 am
    Mar 20, 2012 at 4:26 pm
  • I added a third node to the cluster. Sure enough, this morning I come and only one node is up, in the other two the cassandra process is not running. In the cassandra log there is nothing, but in ...
    Tamar FraenkelTamar Fraenkel
    Mar 15, 2012 at 7:45 am
    Mar 18, 2012 at 10:17 am
  • Hi! I have a 3 node cassandra cluster. I use Hector API. I give hecotr one of the node's IP address I call setAutoDiscoverHosts(true) and setRunAutoDiscoveryAtStartup(true). The describe on one node ...
    Tamar FraenkelTamar Fraenkel
    Mar 18, 2012 at 7:16 am
    Mar 21, 2012 at 6:57 am
  • It is giving errors like " Unable to find abstract-type class 'org.apache.cassandra.db.marshal.utf8' " and java.lang.RuntimeException: org.apache.cassandra.db.marshal.MarshalException: cannot parse ...
    Puneet loyaPuneet loya
    Mar 26, 2012 at 2:53 pm
    Mar 31, 2012 at 7:22 am
  • I need to store activities by each user, on 5 items types. I always want to read last 10 activities on each item type, by a user (ie, total activities to read at a time =50). I am wanting to store ...
    Ertio LewErtio Lew
    Mar 26, 2012 at 9:16 pm
    Mar 29, 2012 at 5:36 am
  • hi, I m puneet, an engineering student. I would like to know that, is cassandra useful considering we just have a single node(rather a single system) having all the information. I m looking for ...
    Puneet loyaPuneet loya
    Mar 24, 2012 at 1:06 pm
    Mar 27, 2012 at 7:03 am
  • I have a row key which is now up to 125,000 columns (and anticipated to grow), I know this is a far-cry from the 2-billion columns a single row key can store in Cassandra but my concern is the amount ...
    Blake StarkenburgBlake Starkenburg
    Mar 20, 2012 at 1:05 am
    Mar 26, 2012 at 10:09 am
  • Hi, I'm using cassandra (1.0.8) embedded in the same jvm as a webapplication. All data is available on all nodes (R = N), read / write CL.ONE. Is it correct to assume in the following scenario that ...
    Mikael WikblomMikael Wikblom
    Mar 15, 2012 at 8:50 am
    Mar 16, 2012 at 9:38 am
  • I know batch operations are not atomic but does the success of a write imply all writes preceeding it in the batch were successful ? For example, using cql: BEGIN BATCH USING CONSISTENCY QUORUM AND ...
    A JA J
    Mar 13, 2012 at 7:11 pm
    Mar 16, 2012 at 1:35 am
  • Using cassandra-1.0.6 one node fails to start. java.lang.OutOfMemoryError: Java heap space at org.apache.cassandra.utils.obs.OpenBitSet.(OpenBitSet.java:92) at ...
    Mick Semb WeverMick Semb Wever
    Mar 11, 2012 at 6:49 pm
    Mar 13, 2012 at 1:24 pm
  • Hi Cassandra Users, A couple of questions on the server side exceptions that I see sometimes - 1. org.apache.thrift.TException: Message length exceeded: 134218240 n How to configure message length? ...
    Tiwari, DushyantTiwari, Dushyant
    Mar 21, 2012 at 11:03 am
    Mar 27, 2012 at 6:13 am
  • How many Column Families are one too many for Cassandra ? I created a db with 5000 CFs (I can go into the reasons later) but the latency seems to be very erratic now. Not sure if it is because of the ...
    A JA J
    Mar 19, 2012 at 1:35 pm
    Mar 21, 2012 at 5:10 pm
  • Hi, We are working on a project that initially is going to have very little data, but we would like to use Cassandra to ease the future scalability. Due to budget constraints, we were thinking to run ...
    Drew KutcharianDrew Kutcharian
    Mar 15, 2012 at 5:17 pm
    Mar 19, 2012 at 9:34 am
  • Hi, I'm using Cassandra 1.0.8, on Windows 7. When I take a snapshot of the database, I find that I am unable to delete the snapshot directory (i.e., dir named ...
    Jim NewshamJim Newsham
    Mar 14, 2012 at 1:53 am
    Mar 15, 2012 at 12:07 am
  • Hi there, I'm currently in a really weird situation. - Nodetool ring says node X is joining (this already takes 12 hours, with no activity) - When I try to remove the token, it says: Exception in ...
    R. VerlangenR. Verlangen
    Mar 7, 2012 at 8:12 am
    Mar 8, 2012 at 6:04 pm
  • I have rows with around 2K-50K columns but when I do a query I only need to fetch few columns between start and end columns. I was wondering what performance overhead does it cause by using slice ...
    Mohit AnchliaMohit Anchlia
    Mar 25, 2012 at 1:25 am
    Mar 26, 2012 at 8:39 pm
  • Hi Everyone, I have a cluster using NetworkTopologyStrategy that looks like this: 10.41.116.22 DC1 RAC1 Up Normal 13.21 GB 10.00% 0 10.54.149.202 DC2 RAC1 Up Normal 6.98 GB 0.00% 1 10.41.116.20 DC1 ...
    Caleb RackliffeCaleb Rackliffe
    Mar 18, 2012 at 7:05 am
    Mar 25, 2012 at 5:01 pm
  • Hi guys, While creating schema on our cluster today I didn't get any errors even when some of the hosts in the cluster were unreachable (not the ones in the same data centre but in another region) ...
    Shoaib MirShoaib Mir
    Mar 16, 2012 at 10:08 pm
    Mar 21, 2012 at 4:52 pm
  • Hi All, With twitter, when I search for words like: "cassandra is the bestest", 4 tweets will appear, including one i just did. My understand that the internals of twitter work in that each word in a ...
    Sasha DolgySasha Dolgy
    Mar 18, 2012 at 2:55 pm
    Mar 19, 2012 at 8:44 am
  • I was able to successfully join a node to already existing one-node cluster (without giving any intital_token), but when I add another machine with identical settings (with changes in listen ...
    Rishabh AgrawalRishabh Agrawal
    Mar 14, 2012 at 9:40 am
    Mar 15, 2012 at 9:09 am
  • *We have cassandra 4 nodes cluster* with RF = 3 (nodes named from 'A' to 'D', initial tokens: *A (25%)*: 20543402371996174596346065790779111550, * B (25%)*: 63454860067234500516210522518260948578, *C ...
    VangerVanger
    Mar 12, 2012 at 9:23 am
    Mar 13, 2012 at 9:06 am
  • Hi All, While benchmarking Cassandra I found "Mutation Dropped" messages in the logs. Now I know this is a good old question. It will be really great if someone can provide a check list to recover ...
    Tiwari, DushyantTiwari, Dushyant
    Mar 5, 2012 at 10:32 am
    Mar 6, 2012 at 8:04 pm
  • Hi *, My Cassandra installation runs on flowing system: - Linux with Kernel 2.6.32.22 - jna-3.3.0 - Java 1.7.0-b147 Sometimes we are getting following error: *** glibc detected *** ...
    Maciej MiklasMaciej Miklas
    Mar 22, 2012 at 8:55 am
    Apr 2, 2012 at 6:56 pm
  • all, we just about ready to push our app live and just have some cassandra tuning left. i've been currently running a 4 node (rep factor 3, simple) in EC2 using the datastax AMIs (thanks datastax) ...
    Deno VichasDeno Vichas
    Mar 26, 2012 at 7:13 pm
    Apr 2, 2012 at 5:42 pm
  • Hello, I am planning on testing OpsCenter to see how it can monitor a multi DC cluster. There are 2 DCs each on a different side of a firewall. I've configured NAT on the firewall to allow the ...
    Alexandru SicoeAlexandru Sicoe
    Mar 29, 2012 at 5:47 pm
    Apr 2, 2012 at 3:07 pm
  • create column family users (uuid PRIMARY KEY firstname text, lastname text, email text, address text, zip int, state text); Is dis above statement correct? I m getting an error " Syntax error at ...
    Puneet loyaPuneet loya
    Mar 27, 2012 at 12:24 pm
    Mar 30, 2012 at 11:42 pm
  • There's a line that says "Make necessary changes to your storage-conf.xml."<http://wiki.apache.org/cassandra/FAQ#modify_cf_config I can't find this file. Does it still exist? If so, where should I ...
    Ben McCannBen McCann
    Mar 25, 2012 at 10:52 pm
    Mar 30, 2012 at 11:08 pm
  • Hi! Asking again, as I didn't get responses :) I have a ring with 3 nodes and replication factor of 2. I have counter cf with the following definition: CREATE COLUMN FAMILY tk_counters with ...
    Tamar FraenkelTamar Fraenkel
    Mar 29, 2012 at 8:10 am
    Mar 29, 2012 at 12:38 pm
  • Hi All, We got lots of Exception in the log, and later the server crashed. any idea what is happening and how to fix it? ERROR [RequestResponseStage:4] 2012-03-21 04:16:30,482 ...
    Daning WangDaning Wang
    Mar 21, 2012 at 5:24 pm
    Mar 28, 2012 at 6:19 pm
  • Hi! Is there a way to read and increment counter column atomically, something like incrementAndGet (Hector)? Thanks, *Tamar Fraenkel * Senior Software Engineer, TOK Media [image: Inline image 1] ...
    Tamar FraenkelTamar Fraenkel
    Mar 19, 2012 at 6:27 pm
    Mar 21, 2012 at 6:44 am
  • The system HintsColumnFamily seems large in my cluster, and I want to track down why that is. I try invoking "listEndpointsPendingHints()" for o.a.c.db.HintedHandoffManager and it never returns, and ...
    Bryce GodfreyBryce Godfrey
    Mar 14, 2012 at 7:34 pm
    Mar 16, 2012 at 6:04 pm
  • Hi! My apologies for the naive question, but I am new to Cassandra and even more to counter columns. If I have a counter column, what happens if two threads are trying to increment it's value at the ...
    Tamar FraenkelTamar Fraenkel
    Mar 14, 2012 at 11:33 am
    Mar 15, 2012 at 3:29 pm
  • Forwarding to the Cassandra mailing list as well, in case this is more of an issue on how I'm using Cassandra. Am I correct to assume that I can use range queries on composite row keys, even when ...
    John LabanJohn Laban
    Mar 14, 2012 at 12:06 am
    Mar 15, 2012 at 8:58 am
  • Hi! I need some advise: I have user CF, which has a UUID key which is my internal user id. One of the column is facebook_id of the user (if exist). I need to have the reverse mapping from facebook_id ...
    Tamar FraenkelTamar Fraenkel
    Mar 11, 2012 at 8:51 am
    Mar 13, 2012 at 6:43 am
  • I have a few column families that I decided to get rid of the secondary indexes on. I see that there aren't any new index SSTables being created, but all of the old ones remain (some from as far back ...
    Frisch, MichaelFrisch, Michael
    Mar 1, 2012 at 1:54 pm
    Mar 7, 2012 at 9:22 am
  • Can be something made to remove these empty delivery attempts from log? Its just tombstoned row. [default@system] list HintsColumnFamily; Using default limit of 100 ------------------- RowKey: 00 1 ...
    Radim KolarRadim Kolar
    Mar 2, 2012 at 7:54 am
    Mar 2, 2012 at 5:23 pm
  • Everything that I've read about data centers focuses on setting things up at the beginning of time. I've the the following situation: 10 machines in a datacenter (DC1), with replication factor of 2 ...
    David KoblasDavid Koblas
    Mar 5, 2012 at 3:43 pm
    May 17, 2012 at 12:28 am
  • Hi guys, I am consistently seeing a 20% improvement in query retrieval times if I use the composite comparator "Timestamp:ID" instead of "ID:Timestamp" where Timestamp=Long and ID=~100 character ...
    Alexandru SicoeAlexandru Sicoe
    Mar 30, 2012 at 12:30 pm
    Apr 3, 2012 at 6:12 pm
  • Where the F^$% have the packages for 06x gone? http://www.apache.org/dist/cassandra/debian/dists/06x/main/binary-amd64/ Is empty. What gives?
    Ashley MartensAshley Martens
    Mar 29, 2012 at 12:46 am
    Mar 29, 2012 at 3:51 pm
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144 users for March 2012

Aaron morton: 126 posts Tamar Fraenkel: 47 posts R. Verlangen: 31 posts Watanabe Maki: 25 posts Puneet loya: 20 posts Radim Kolar: 18 posts Rishabh Agrawal: 15 posts Ben McCann: 14 posts A J: 13 posts Alexandru Sicoe: 13 posts Cyril Scetbon: 12 posts Thomas van Neerijnen: 12 posts Tyler Hobbs: 12 posts Jeremiah Jordan: 11 posts Tharindu Mathew: 10 posts Edward Capriolo: 9 posts Maciej Miklas: 9 posts Mohit Anchlia: 9 posts Sylvain Lebresne: 9 posts Sasha Dolgy: 8 posts
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