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105 discussions - 427 posts

  • Hi there, use case: - Heavy write app, few reads. - Lots of updates of rows / columns. - Current performance is fine, for both writes and reads.. - Currently using SizedCompactionStrategy We're ...
    Stephane LegayStephane Legay
    Nov 22, 2014 at 11:27 pm
    Nov 25, 2014 at 7:41 pm
  • Hello. So, I have detected a data inconsistency between my nodes: (Consistency level is ONE) [disco@Disco] get NamespaceFile2['45fc8996-41bc-429b-a382-5da9294eb59c:/XXXDIRXXX']['XXXFILEXXX']; Value ...
    André CruzAndré Cruz
    Nov 14, 2014 at 4:43 pm
    Dec 1, 2014 at 7:37 pm
  • There’s still a lot of weirdness in CQL. For example, you can do an INSERT with an UPDATE .. .which I’m generally fine with. Kind of make sense. However, with INSERT you can do IF NOT EXISTS. … but ...
    Kevin BurtonKevin Burton
    Nov 17, 2014 at 9:53 pm
    Dec 30, 2014 at 5:50 pm
  • What's the latest on the maximum number of keyspaces and/or tables that one can have in Cassandra 2.1.x? -Raj
    Raj NRaj N
    Nov 25, 2014 at 5:07 pm
    Dec 8, 2014 at 9:41 pm
  • Hello all, We are looking for a solution to backup data in our C* cluster (v2.0.x, 16 nodes, 4 x 500GB SSD, RF = 6 over 2 datacenters). The main purpose is to protect us from human errors (eg ...
    Ngoc Minh VONgoc Minh VO
    Nov 18, 2014 at 2:52 pm
    Dec 2, 2014 at 7:45 am
  • Hello all, My work will be deploying a cassandra cluster next year. Due to internal wrangling we can't seem to agree on the hardware. The software hasn't been finished, but management are asking for ...
    Jabbar AzamJabbar Azam
    Nov 7, 2014 at 8:25 pm
    Nov 8, 2014 at 10:35 pm
  • Hi, We use a four-node Cassandra-Cluster in Version 2.1.2. Our Client-Applications creates Tables dynamically. At one point two (or more) of our Clients connected to two (or more) different ...
    Peter LangePeter Lange
    Nov 27, 2014 at 1:26 pm
    Nov 30, 2014 at 3:23 pm
  • Hi! I have some data in a table created using thrift. In cassandra-cli, the 'show schema' output for this table is: create column family Users with column_type = 'Standard' and comparator = ...
    Erik ForsbergErik Forsberg
    Nov 11, 2014 at 2:01 pm
    Nov 19, 2014 at 9:36 am
  • is there any significant performance penalty if one turn on Cassandra query tracing, through DataStax java driver (say, per every query request of some trouble query)? More sampling seems better but ...
    Jimmy LinJimmy Lin
    Nov 7, 2014 at 5:36 pm
    Nov 15, 2014 at 10:04 am
  • Hello, This is a recurrent behavior of JVM GC in Cassandra that I never completely understood: when a node is UP for many days (or even months), or receives a very high load spike (3x-5x normal ...
    Paulo Ricardo Motta GomesPaulo Ricardo Motta Gomes
    Nov 28, 2014 at 8:57 pm
    Dec 3, 2014 at 10:47 am
  • Akshay BallarpureAkshay Ballarpure
    Nov 18, 2014 at 3:38 pm
    Nov 28, 2014 at 12:56 pm
  • Hey all, For legacy reasons we're living with Cassandra 2.0.10 in an RF=1 setup. This is being moved away from ASAP. In the meantime, adding a node recently encountered a Stream Failed error ...
    Alain VandendorpeAlain Vandendorpe
    Nov 17, 2014 at 8:06 pm
    Nov 19, 2014 at 9:33 pm
  • Dear all, I have the following problem: - C* 2.0.11 - LCS with default 160MB - Compacted partition maximum bytes: 785939 (for cf/table xxx.xxx) - Compacted partition mean bytes: 6750 (for cf/table ...
    Andrei IvanovAndrei Ivanov
    Nov 18, 2014 at 1:08 pm
    Nov 18, 2014 at 6:21 pm
  • Hello, We are facing a "difficult" problem when trying to use the TokenAware policy when performing writes, as our write request are always unbalanced due some unknown reason. Maybe we have something ...
    Gabriel MenegattiGabriel Menegatti
    Nov 11, 2014 at 8:00 pm
    Nov 15, 2014 at 5:01 pm
  • Hi Team, Please suggest me the better options to load data from NoSql to Cassndra. Thanks Srini
    Srinivas raoSrinivas rao
    Nov 11, 2014 at 12:53 pm
    Nov 13, 2014 at 4:29 pm
  • We’re looking at switching data centers and they’re offering pretty aggressive pricing on boxes with fusion IO cards. 2x 1.2TB Fusion IO 128GB RAM 20 cores. now.. this isn’t the typical cassandra ...
    Kevin BurtonKevin Burton
    Nov 6, 2014 at 8:42 pm
    Nov 6, 2014 at 11:13 pm
  • Hello! I have the following scenario: 1. For ensuring high availability I would like to install one Cassandra cluster on one availability zone (on Amazon EC2 US-east) and one Cassandra cluster on ...
    Spico FlorinSpico Florin
    Nov 25, 2014 at 3:10 pm
    Dec 1, 2014 at 6:46 pm
  • If I run this tool on a given host, it shows me stats for only the cases where that host was the coordinator node, correct? Is there any way (other than me cooking up a little script) to ...
    Clint KellyClint Kelly
    Nov 19, 2014 at 11:23 pm
    Nov 20, 2014 at 4:51 pm
  • Hi, I recently ran a migration where I modified (essentially, deleted and inserted) a large number of clustering keys. This obviously created a lot of tombstones and now I am receiving warnings in my ...
    Jens RantilJens Rantil
    Nov 1, 2014 at 3:19 pm
    Nov 19, 2014 at 9:36 pm
  • I’m trying to figure out the best way to handle things like set appends (and other CQL extensions) in traditional OR mapping. Our OR mapper does basic setFoo() .. then save() to write the record back ...
    Kevin BurtonKevin Burton
    Nov 14, 2014 at 4:57 am
    Nov 14, 2014 at 7:04 am
  • Hi, Anyone who is using, or could recommend, a tool for versioning schemas/migrating in Cassandra? My list of requirements is: * Support for adding tables. * Support for versioning of table ...
    Jens RantilJens Rantil
    Nov 25, 2014 at 9:23 am
    Dec 5, 2014 at 2:37 pm
  • Hi, We have a web crawler project currently based on Cassandra ( https://github.com/iParadigms/walker, written in Go and using the gocql driver), with the following relevant usage pattern: - Big ...
    Dan KinderDan Kinder
    Nov 25, 2014 at 12:27 am
    Nov 25, 2014 at 10:55 pm
  • I’m trying to track down some exceptions in our production cluster. I bumped up our write load and now I’m getting a non-trivial number of these exceptions. Somewhere on the order of 100 per hour ...
    Kevin BurtonKevin Burton
    Nov 24, 2014 at 8:58 pm
    Nov 25, 2014 at 1:54 am
  • Hi, we upgraded a 6 node Cluster from Cassandra 2.0.7 to 2.1.1 recently sticking to this guide: http://www.datastax.com/documentation/upgrade/doc/upgrade/cassandra/upgradeCassandraDetails.html After ...
    Andreas FinkeAndreas Finke
    Nov 20, 2014 at 3:00 pm
    Nov 20, 2014 at 5:53 pm
  • I've successfully built 2.1.2 for FreeBSD, but the JVM crashes upon start-up. Here's the snippet from the top of the log file (attached) # # A fatal error has been detected by the Java Runtime ...
    William ArbaughWilliam Arbaugh
    Nov 18, 2014 at 1:20 am
    Nov 20, 2014 at 1:53 am
  • Hi, Is there a way to detect which version of Cassandra one is running? Is there an API for that, or a constant with this value, or maybe an MBean or some other way to get to this info? Here's the ...
    Otis GospodneticOtis Gospodnetic
    Nov 12, 2014 at 10:46 pm
    Nov 13, 2014 at 6:00 pm
  • Hello, I am working on PHP cassandra integration, please let me know which library is good from scalability and performance perspective ? Best Regards Akshay Ballarpure Tata Consultancy Services ...
    Akshay BallarpureAkshay Ballarpure
    Nov 10, 2014 at 6:49 am
    Nov 11, 2014 at 6:28 pm
  • We are using v2.0.11 and have seen several instances in our 24 node cluster where the node becomes unresponsive, when we look into it we find that there is a cassandra process chewing up a lot of ...
    Stan LemonStan Lemon
    Nov 26, 2014 at 4:08 am
    Nov 26, 2014 at 5:19 pm
  • We are experiencing data loss with Cassandra 1.0.10 when we had restarted the without flushing. We see in the cassandra logs that the commitlogs were read back without any problems. Until the restart ...
    Ankit PatelAnkit Patel
    Nov 24, 2014 at 11:20 pm
    Nov 25, 2014 at 8:00 pm
  • Hi, There is something odd I have observed when testing a configuration with two DC for the first time. I wanted to do a simple functional test to prove myself (and my pessimistic colleagues ;) ) ...
    Nikolai GrigorievNikolai Grigoriev
    Nov 20, 2014 at 3:54 pm
    Nov 21, 2014 at 12:49 am
  • Hi, We have two data-center, we configured PasswordAuthenticator on each node, we increment the RF of system_auth to the number of nodes (each data-center) as recommended. We can logged-in via cqlsh ...
    Nov 20, 2014 at 8:22 am
    Nov 20, 2014 at 4:03 pm
  • I'm running a 4 node cluster with RF=3, CL of QUORUM for writes and ONE for reads. Each node has 3.7GB RAM with 32GB SSD HD, commitlog is on another HD. Currently each node has about 12GB of data ...
    Nov 16, 2014 at 7:52 pm
    Nov 17, 2014 at 1:39 am
  • Hi all, Over what time range does "nodetool cfhistograms" operate? I am using Cassandra I am trying to debug some very high 95th and 99th percentile read latencies in an application that ...
    Clint KellyClint Kelly
    Nov 16, 2014 at 5:13 pm
    Nov 16, 2014 at 10:04 pm
  • Hi There, I have a question about Cassandra node repair, there is a function called "forceTerminateAllRepairSessions();", so will the function terminate all the repair session in only one node, or it ...
    Di, JiemingDi, Jieming
    Nov 14, 2014 at 3:02 am
    Nov 15, 2014 at 3:23 am
  • Hi, we have two datacenter with those inof: Cassandra version 2.1.0 DC1 with 5 nodes DC2 with 5 nodes we set the snitch to GossipingPropertyFileSnitch and in cassandra-rackdc.properties we put: in ...
    Nov 13, 2014 at 6:29 pm
    Nov 14, 2014 at 2:03 pm
  • We're doing development on a single node cluster (and yes of course we're not really deploying that way), and we're getting inconsistent behavior on reads after writes. We write values to our ...
    Brian TarboxBrian Tarbox
    Nov 6, 2014 at 2:16 pm
    Nov 6, 2014 at 6:35 pm
  • Hi, I am currently testing with Cassandra and Spring Data Cassandra. I would now need to store files (images and avi files, normally up to 50 Mb big). I did find the Chuncked Object store ...
    Wim DeblauweWim Deblauwe
    Nov 5, 2014 at 4:20 pm
    Nov 6, 2014 at 12:24 pm
  • In the logging configuration that ships with the cassandra distribution (log4j-server.properties in 2.0, and logback.xml in 2.1), the rolling file appender is configured to print the file name and ...
    Matt BrownMatt Brown
    Nov 26, 2014 at 6:39 pm
    Nov 26, 2014 at 8:08 pm
  • Does hector or cassandra imposes a limit on max ttl value for a column? I am trying to insert record into one of the column family and seeing the following error.. Cassandra version : 1.1.12 ...
    Rajanish GJRajanish GJ
    Nov 21, 2014 at 5:30 pm
    Nov 25, 2014 at 5:21 pm
  • I’m working on moving a bunch of counters out of our relational database to Cassandra. For the most part, Cassandra is a very nice fit, except for one feature on our website. We manage a time series ...
    Robert WilleRobert Wille
    Nov 23, 2014 at 3:42 pm
    Nov 25, 2014 at 2:34 pm
  • Akhtar Hussain shared a search result with you ----------------------------- ...
    Akhtar Hussain (JIRA)Akhtar Hussain (JIRA)
    Nov 21, 2014 at 11:15 am
    Nov 24, 2014 at 12:14 pm
  • 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 ...
    Jan KarlssonJan Karlsson
    Nov 21, 2014 at 9:21 am
    Nov 24, 2014 at 9:02 am
  • I have a CF that use the default, read_repair_chance (0.1) and dc_read_repair_chance(0). Our read and write is all local_quorum, on one of the 2 DC, replication of 3. so a read will have 10% chance ...
    Jimmy LinJimmy Lin
    Nov 16, 2014 at 11:15 pm
    Nov 22, 2014 at 12:43 am
  • I upgraded a 2 node cluster with RF = 2 from 1.0.9 to 2.0.11. I did rolling upgrades and upgradesstables after each upgrade. We then moved our data to new hardware by shutting down each node, moving ...
    Stephane LegayStephane Legay
    Nov 20, 2014 at 4:38 pm
    Nov 20, 2014 at 7:10 pm
  • I’m trying to build a histograph in CQL for various records. I’d like to keep a max of ten items or items with a TTL. but if there are too many items, I’d like to trim it so the max number of records ...
    Kevin BurtonKevin Burton
    Nov 14, 2014 at 11:24 pm
    Nov 16, 2014 at 7:29 pm
  • Hello, We are using Cassandra 2.1.2 in a multi dc cluster (30 servers on DC1 and 10 on DC2) with a key space replication factor of 1 on DC1 and 2 on DC2. For some reason when we increase the volume ...
    Gabriel MenegattiGabriel Menegatti
    Nov 16, 2014 at 1:49 pm
    Nov 16, 2014 at 6:17 pm
  • Hi, we use Cassandra to store some association type of data. For example, store user to course (course registrations) association and user to school (school enrollment) association data. The schema ...
    Li, GeorgeLi, George
    Nov 13, 2014 at 4:42 pm
    Nov 13, 2014 at 5:41 pm
  • I have a 5 node cluster. In one node one of the data directory partition got crashed. After disk replacement I restarted the Cassandra daemon and gave nodetool repair to restore the missing ...
    Venkat samVenkat sam
    Nov 11, 2014 at 6:52 pm
    Nov 12, 2014 at 9:25 pm
  • Hello people, below is an extraction from cassandra system log. ERROR [Thread-273] 2012-04-10 16:33:18,328 AbstractCassandraDaemon.java (line 139) Fatal exception in thread Thread[Thread-273,5,main] ...
    Jason WeeJason Wee
    Nov 10, 2014 at 2:26 pm
    Nov 11, 2014 at 5:15 am
  • Hey all, I have a 3 node Cassandra cluster I would like to hook into hadoop for processing the information in the Cassandra DB. I know that Datastax version of Cassandra includes support for Hadoop ...
    Tim DunphyTim Dunphy
    Nov 28, 2014 at 6:31 pm
    Nov 29, 2014 at 5:58 am
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127 users for November 2014

Robert Coli: 50 posts Kevin Burton: 19 posts DuyHai Doan: 16 posts Eric Stevens: 15 posts Andrei Ivanov: 14 posts Nikolai Grigoriev: 12 posts Tyler Hobbs: 12 posts André Cruz: 11 posts Michael Shuler: 10 posts Adil: 8 posts Jens Rantil: 8 posts Mark Reddy: 8 posts Jimmy Lin: 7 posts Jonathan Haddad: 7 posts Akshay Ballarpure: 6 posts Clint Kelly: 6 posts Graham sanderson: 6 posts Jabbar Azam: 6 posts Erik Forsberg: 5 posts Gabriel Menegatti: 5 posts
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