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104 discussions - 475 posts

  • Hi, I am using Cassandra 2.0.9 running on Debian Wheezy, and I am having "too many open files" exceptions when I try to perform a large number of operations in my 10 node cluster. I saw the ...
    Marcelo Elias Del ValleMarcelo Elias Del Valle
    Aug 8, 2014 at 7:36 pm
    Aug 10, 2014 at 1:50 am
  • I am trying to bootstrap the thirteenth node in a 12 node cluster where the average data size per node is about 2.1 TB. The bootstrap streaming has been going on for 2 days now, and the disk size on ...
    Ruchir JhaRuchir Jha
    Aug 4, 2014 at 5:42 pm
    Aug 12, 2014 at 1:53 pm
  • Hi All, I have a couple of simple questions. When will Cassandra 2.1 be released as GA? Will there be a datastax CQL driver available then? Will Cassandra 2.1 and Datastax CQL driver support nested ...
    Tony AnecitoTony Anecito
    Aug 20, 2014 at 8:45 pm
    Aug 21, 2014 at 5:34 pm
  • Hi everyone, For some integration tests, we start up a CassandraDaemon in a separate process (using the Java 7 ProcessBuilder API). All of my integration tests run beautifully on my laptop, but one ...
    Clint KellyClint Kelly
    Aug 6, 2014 at 3:17 am
    Aug 26, 2014 at 2:08 pm
  • I have following database schema CREATE TABLE sensor_info_table ( asset_id text, event_time timestamp, "timestamp" timeuuid, sensor_reading map<text, text , sensor_serial_number text, sensor_type ...
    Subodh NijsureSubodh Nijsure
    Aug 31, 2014 at 11:43 pm
    Sep 1, 2014 at 4:11 pm
  • I'm tracking down a weird bug and was wondering if you guys had any feedback. I'm trying to create ten tables programatically.. . The first one I create, for some reason, isn't created. The other 9 ...
    Kevin BurtonKevin Burton
    Aug 13, 2014 at 8:09 pm
    Aug 13, 2014 at 9:16 pm
  • Hi - On this page ( http://www.datastax.com/documentation/cql/3.0/cql/ddl/ddl_when_use_index_c.html), the docs state: Do not use an index [...] On a frequently updated or deleted column and I'm ...
    Ian RoseIan Rose
    Aug 10, 2014 at 6:20 pm
    Aug 13, 2014 at 3:49 pm
  • One of our nodes is getting an increasing number of pending compactions due, we think, to https://issues.apache.org/jira/browse/CASSANDRA-7145 , which is fixed in future version 2.0.11 . (We had the ...
    Donald SmithDonald Smith
    Aug 30, 2014 at 2:10 am
    Sep 2, 2014 at 6:42 pm
  • Hi - I am currently running a single Cassandra node on my local dev machine. Here is my (test) schema (which is meaningless, I created it just to demonstrate the issue I am running into): CREATE ...
    Ian RoseIan Rose
    Aug 13, 2014 at 2:26 am
    Aug 20, 2014 at 4:17 pm
  • In our Twitter-like application users have their own timelines with news from subscriptions. To populate timelines we're using fanout on write. But we forced to trim it to keep free disk space under ...
    DimetrioDimetrio
    Aug 18, 2014 at 9:52 am
    Aug 19, 2014 at 6:37 am
  • What's a reasonable range for the max number of tables? We have an append-only table system and I've been thinking of moving them to using hourly / partitioned tables. This means I can do things like ...
    Kevin BurtonKevin Burton
    Aug 4, 2014 at 7:43 pm
    Aug 18, 2014 at 9:25 pm
  • We're using cassandra 2.0.9 with datastax java cassandra driver 2.0.0 in a cluster of eight nodes. We're doing an insert and after a delete like: delete from *column_family_name* where *id* = value ...
    Sávio S. Teles de OliveiraSávio S. Teles de Oliveira
    Aug 25, 2014 at 8:25 pm
    Jan 5, 2015 at 4:58 pm
  • I'm using JMX to retrieve Cassandra metrics. I notice that Max and Count are cumulative and aren't reset. How often are the stats for Mean, 99tthPercentile, etc reset back to zero? For example, ...
    Donald SmithDonald Smith
    Aug 27, 2014 at 7:38 pm
    Aug 29, 2014 at 7:06 pm
  • Hi All, I am installing Cassandra Multinode Setup on a 4 node CentOs Cluster, my cassandra.yaml looks like so cluster_name: 'node' initial_token: 0 num_tokens: 256 seed_provider: - class_name ...
    Vineet MishraVineet Mishra
    Aug 26, 2014 at 7:12 am
    Aug 27, 2014 at 1:48 pm
  • tl;dr: Decommissioning datacenters by running nodetool decommission on a node deletes the data on the decommissioned node - is this expected ? I am trying our some tests on my multi-datacenter ...
    SrmoreSrmore
    Aug 7, 2014 at 3:26 pm
    Aug 7, 2014 at 8:01 pm
  • Hi, My understanding is that NetworkTopologyStrategy does NOT play well with vnodes, due to: * Vnode = tokens are (usually) randomly generated (AFAIK) * NetworkTopologyStrategy = required carefully ...
    DE VITO DominiqueDE VITO Dominique
    Aug 5, 2014 at 3:20 pm
    Aug 6, 2014 at 1:29 pm
  • Hi, All, I want to run 'update keyspace with strategy_options={dc1:3, dc2:3}' from cassandra-cli to update the strategy options of some keyspace in a multi-DC environment. When the command returns ...
    Lu, BoyingLu, Boying
    Aug 5, 2014 at 8:32 am
    Aug 5, 2014 at 4:04 pm
  • Hey Guys, AFAIK, currently Cassandra partitions (thrift) rows using the row key, basically uses the hash(row_key) to decide what node that row needs to be stored on. Now there are times when there is ...
    Drew KutcharianDrew Kutcharian
    Aug 29, 2014 at 10:48 pm
    Aug 30, 2014 at 12:46 am
  • Hi all, Is there a way to use the cassandra-stress tool with clustering columns? I am trying to figure out whether an application that I'm running on is slow because of my application logic, C* data ...
    Clint KellyClint Kelly
    Aug 17, 2014 at 7:27 pm
    Aug 19, 2014 at 4:42 pm
  • Hi all, I'm working on transferring our thrift DAOs over to CQL. It's going well, except for 2 cases that both use multi get. The use case is very simple. It is a narrow row, by design, with only a ...
    Todd NineTodd Nine
    Aug 31, 2014 at 12:59 am
    Sep 1, 2014 at 9:54 am
  • Hey folks, After adding more nodes and moving tokens of "old" nodes to rebalance the ring, I noticed that the "old" nodes had significant more data then the newly bootstrapped nodes, even after ...
    Paulo Ricardo Motta GomesPaulo Ricardo Motta Gomes
    Aug 26, 2014 at 6:38 pm
    Aug 29, 2014 at 6:39 pm
  • How do I watch the progress of nodetool repair. Looks like the folklore from the list says to just use nodetool compactionstats nodetool netstats … but the repair seems locked/stalled and neither of ...
    Kevin BurtonKevin Burton
    Aug 21, 2014 at 7:32 pm
    Aug 22, 2014 at 4:43 am
  • Hi all, I want to add a data-center to an existing single data-center cluster. First I have to make the existing cluster multi data-center compatible. The existing cluster is a 12 node cluster with ...
    Rene KochenRene Kochen
    Aug 5, 2014 at 10:52 am
    Aug 6, 2014 at 2:43 am
  • Is it possible in CQL to create a table that supports dynamic column names? I am using C* v2.0.9, which I assume implies CQL version 3. This page appears to show that this was supported in CQL 2 with ...
    Ian RoseIan Rose
    Aug 26, 2014 at 7:13 pm
    Aug 27, 2014 at 3:48 pm
  • The latest consensus around the web for running Cassandra on EC2 seems to be "use new SSD instances." I've not seen any mention of the elephant in the room - using the new SSD instances significantly ...
    Jeremy JongsmaJeremy Jongsma
    Aug 19, 2014 at 3:57 pm
    Aug 19, 2014 at 7:34 pm
  • Some questions on nodetool repair. 1. This tool repairs inconsistencies across replicas of the row. Since latest update always wins, I dont see inconsistencies other than ones resulting from the ...
    Viswanathan RamachandranViswanathan Ramachandran
    Aug 12, 2014 at 9:07 pm
    Aug 13, 2014 at 5:22 am
  • Hi all, Allow me to rephrase a question I asked last week. I am performing some queries with ALLOW FILTERING and getting consistent read timeouts like the following ...
    Clint KellyClint Kelly
    Aug 5, 2014 at 5:02 pm
    Aug 5, 2014 at 7:52 pm
  • Hi Could you recommend a Scala driver and share your experiences of using it. Im thinking if i use java driver in Scala directly. Thanks
    Gary ZhaoGary Zhao
    Aug 31, 2014 at 5:20 am
    Sep 2, 2014 at 2:23 pm
  • I already have a 3node m3.large DSE cluster, but I can't seem to add another m3.large node. I'm using the ubuntu-trusty-14.04-amd64-server-20140607.1 (ami-a7fdfee2) AMI (instance-store backed, PV) on ...
    Stephen PortanovaStephen Portanova
    Aug 27, 2014 at 8:51 am
    Aug 28, 2014 at 10:31 pm
  • Hi I installed Cassandra on one node successfully using CLI I am able to add a table to the keyspace as well as retrieve the data from the table. My query is if I have text file on my local file ...
    Malay NilabhMalay Nilabh
    Aug 27, 2014 at 12:14 pm
    Aug 27, 2014 at 7:59 pm
  • Hi, I have question on inserting multiple cluster keys under same partition key. Ex: CREATE TABLE Employee ( deptId int, empId int, name varchar, address varchar, salary int, PRIMARY KEY(deptId, ...
    Jaydeep ChovatiaJaydeep Chovatia
    Aug 26, 2014 at 4:51 pm
    Aug 27, 2014 at 4:43 pm
  • Hello all Usually, when using DELETE in CQL3 on some fields, C* creates tombstone columns for those fields. Now if I delete a whole PARTITION (delete from MyTable where partitionKey=...), what will ...
    DuyHai DoanDuyHai Doan
    Aug 7, 2014 at 3:34 pm
    Aug 21, 2014 at 6:45 pm
  • Hello, I am fairly new to cassandra so this might be naieve question: I have table that currently has following entries: SELECT asset_id,event_time,sensor_type, temperature,humidity from ...
    Subodh NijsureSubodh Nijsure
    Aug 17, 2014 at 10:45 am
    Aug 17, 2014 at 8:44 pm
  • Hi, All, We are using Cassandra 2.0.7 in a multi DCs environments. If a connected DC is powered off, we use the 'nodetool removenode' command to remove it from the connected DCs. But we found that ...
    Lu, BoyingLu, Boying
    Aug 14, 2014 at 5:49 am
    Aug 14, 2014 at 8:05 pm
  • Hi everyone, I'm confused with number of columns in a row of Cassandra, as far as I know there is 2 billions columns per row. Like that if I have a composite column name in each row, for ex ...
    HlqvHlqv
    Aug 12, 2014 at 5:14 pm
    Aug 13, 2014 at 8:51 pm
  • Hi all, We have a node with commit log director ~4G. During start-up of the node on commit log replaying the used heap space is constantly growing ending with OOM error. The heap size and new heap ...
    Jivko donevJivko donev
    Aug 12, 2014 at 4:35 pm
    Aug 13, 2014 at 11:23 am
  • We recently upgraded C* from 2.0.5 to 2.0.9 We have some data that is partitioned in tables created periodically (once a day). This morning, this automated process timed out because the schema did ...
    Graham sandersonGraham sanderson
    Aug 8, 2014 at 8:45 pm
    Aug 10, 2014 at 6:14 pm
  • You need to create an index on attribute *c.* 2014-08-05 9:24 GMT-03:00 Jens Rantil <<span class="m_body_email_addr" title="5945ff2762af569829af85a971f84ce2" jens.rantil@tink.se</span : -- ...
    Sávio S. Teles de OliveiraSávio S. Teles de Oliveira
    Aug 5, 2014 at 6:12 pm
    Aug 7, 2014 at 12:50 am
  • Hello All, We are on 1.2.18 (running on Ubuntu 12.04) and we recently tried to add a second DC on our demo environment, just before trying it on live. The existing DC1 has two nodes which ...
    Vasileios VlachosVasileios Vlachos
    Aug 5, 2014 at 8:29 am
    Aug 6, 2014 at 9:26 pm
  • Hi everyone, I am seeing occasional read timeouts during multi-row queries, but I'm having difficulty reproducing them or understanding what the problem is. First, some background: Our team wrote a ...
    Clint KellyClint Kelly
    Aug 2, 2014 at 12:02 am
    Aug 4, 2014 at 4:18 pm
  • Hi, I see a lot of activity around the OpsCenter_rollups CFs in the logs. Why is there so much OpsCenter work happening? Is there a way to disable it, and whats the impact? Ruchir.
    Ruchir JhaRuchir Jha
    Aug 25, 2014 at 8:42 pm
    Sep 2, 2014 at 4:58 am
  • In the datastax documentation there is a description how to replace a dead node (http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_replace_node_t.html). Is the ...
    TsiTsi
    Aug 12, 2014 at 11:34 am
    Aug 25, 2014 at 8:11 am
  • Hi, I'm new with Cassandra and I wondering what is the best design for my case. I have a set of buckets that contain one or thousands of contents. Here is my Content CF : CREATE TABLE IF NOT EXISTS ...
    Leleu EricLeleu Eric
    Aug 22, 2014 at 2:47 pm
    Aug 22, 2014 at 5:47 pm
  • After we dropped a table, we noticed that the sstables are still there. After searching through the forum history, I noticed that this is known behavior. 1) Is there any negative impact of deleting ...
    Parag PatelParag Patel
    Aug 19, 2014 at 3:59 pm
    Aug 21, 2014 at 4:15 pm
  • So , right now, I have a full cassandra cluster… all my nodes are down. Fun! And I have a table, which I could just issue a truncate command to. It's just a log table so dropping the data is fine ...
    Kevin BurtonKevin Burton
    Aug 20, 2014 at 10:46 pm
    Aug 21, 2014 at 12:11 am
  • Hi, What is the state of Cassandra Wiki -- http://wiki.apache.org/cassandra ? I tried to update a few pages, but it looks like pages are immutable. Do I need to have my Wiki username ...
    Otis GospodneticOtis Gospodnetic
    Aug 18, 2014 at 10:16 am
    Aug 19, 2014 at 7:38 pm
  • The DataStax java driver has a Row object which getInt, getLong methods… However, the getString only works on string columns. That's probably reasonable… but if I have a raw Row, how the heck do I ...
    Kevin BurtonKevin Burton
    Aug 19, 2014 at 1:30 am
    Aug 19, 2014 at 4:04 pm
  • Is there some unwritten wisdom with regards to the use 'nodetool compact' before bootstrapping new nodes and decommissioning old ones? TL;DR: I've been spending the last few days trying to move a ...
    MaximeMaxime
    Aug 17, 2014 at 1:47 pm
    Aug 18, 2014 at 5:57 pm
  • When adding nodes via bootstrap to a 27 node 2.0.9 cluster with a cluster-wide phi_convict_threshold of 12 the nodes fail to bootstrap. This worked a half dozen times in the past few weeks as we've ...
    Peter HaggertyPeter Haggerty
    Aug 15, 2014 at 4:46 am
    Aug 15, 2014 at 11:10 pm
  • Hi all, I have a question about communication between two data-centers, both with replication-factor three. If I read data using local_quorum from datacenter1, I see that digest requests are sent to ...
    Rene KochenRene Kochen
    Aug 14, 2014 at 2:53 pm
    Aug 14, 2014 at 7:36 pm
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118 users for August 2014

Robert Coli: 54 posts Kevin Burton: 24 posts DuyHai Doan: 20 posts Clint Kelly: 18 posts Mark Reddy: 17 posts Ruchir Jha: 14 posts Jack Krupansky: 13 posts Ian Rose: 11 posts Sylvain Lebresne: 10 posts Graham sanderson: 8 posts Lu, Boying: 8 posts Mark Reddy: 8 posts Subodh Nijsure: 8 posts Tony Anecito: 8 posts Jonathan Haddad: 7 posts DE VITO Dominique: 6 posts Donald Smith: 6 posts Jens Rantil: 6 posts Vineet Mishra: 6 posts Viswanathan Ramachandran: 6 posts
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