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98 discussions - 483 posts

  • Hello, I am inserting about 100 million entries via datastax-java driver to a cassandra cluster of 3 nodes. Table structure is as create keyspace test with replication = {'class' ...
    Anishek AgarwalAnishek Agarwal
    Apr 21, 2015 at 11:28 am
    Apr 22, 2015 at 12:41 pm
  • Hi, I am new to Cassandra. I have setup a cluster with Cassandra 2.0.13. I am writing the same data in HBase and Cassandra and find that the writes are extremely slow in Cassandra and frequently ...
    Amlan RoyAmlan Roy
    Apr 1, 2015 at 2:06 pm
    Apr 2, 2015 at 6:18 pm
  • Hi all, I have some fields that I am storing into Cassandra, but some of them could be null at any given point. As there are quite a lot of them, it makes the code much more readable if I don’t check ...
    Matthew JohnsonMatthew Johnson
    Apr 29, 2015 at 10:14 am
    May 7, 2015 at 6:38 am
  • Recently we faced an issue where every repair operation caused addition of hundreds of sstables (CASSANDRA-9146). In order to bring situation under control and make sure reads are not impacted, we ...
    Anuj WadehraAnuj Wadehra
    Apr 12, 2015 at 6:40 pm
    Apr 24, 2015 at 1:34 am
  • Hey all, We are working on moving a mysql based application to Cassandra. The workflow in mysql is this: We have two tables: active and archive . Every hour, we pull in data from an external API. The ...
    Ali AkhtarAli Akhtar
    Apr 23, 2015 at 3:13 pm
    Apr 27, 2015 at 12:11 pm
  • Hello all, We are getting the OutOfMemoryError on one of the Node and the Node is down, when we run the export command to get all the data from a table. Regards Neha ERROR [ReadStage:532074] ...
    Neha TrivediNeha Trivedi
    Apr 20, 2015 at 5:38 am
    Apr 21, 2015 at 3:37 am
  • Hi, I switched from HBase to Cassandra and try to find problem solution for timeseries analysis on top Cassandra. I have a entity named "Event". "Event" has attributes: user_id - a guy who triggered ...
    Serega SheypakSerega Sheypak
    Apr 4, 2015 at 11:04 am
    Apr 6, 2015 at 10:39 am
  • Hi all, Currently looking at switching from HBase to Cassandra, and one big difference so far is that in HBase, we create a ‘Put’ object, add to it a set of column/value pairs, and send the Put to ...
    Matthew JohnsonMatthew Johnson
    Apr 23, 2015 at 1:30 pm
    Apr 24, 2015 at 1:49 pm
  • We were chatting to Jon Haddena about a week ago about our tombstone issue using Cassandra 2.0.14 To Summarize We have a 3 node cluster with replication-factor=3 and compaction = SizeTiered We use 1 ...
    Walsh, StephenWalsh, Stephen
    Apr 21, 2015 at 3:15 pm
    Apr 23, 2015 at 8:30 am
  • Hi All. I am using 20 nodes cassandra cluster with RF=3 and CL=1. We are doing very write/read heavy operations (total 100k ops/sec). I have been assuming all along that all the data will be ...
    Pranay AgarwalPranay Agarwal
    Apr 10, 2015 at 1:10 am
    Apr 10, 2015 at 7:31 pm
  • Hello, Yesterday we ran into a serious issue while joining a new node to our existing 4 node Cassandra cluster (version 2.0.7). The average node data size is 152GB's with a replication factor of 3 ...
    Thomas MillerThomas Miller
    Apr 23, 2015 at 6:19 pm
    May 12, 2015 at 3:02 pm
  • hi, we have some unit tests that run parallel that will create tmp keyspace, and tables and then drop them after tests are done. From time to time, our create table statement run into "All hosts(s) ...
    Jimmy LinJimmy Lin
    Apr 19, 2015 at 11:15 pm
    Apr 23, 2015 at 5:22 pm
  • Hi, Recently, we discovered that millions of mutations were getting dropped on our cluster. Eventually, we solved this problem by increasing the value of memtable_flush_writers from 1 to 3. We ...
    Anuj WadehraAnuj Wadehra
    Apr 20, 2015 at 2:28 pm
    Apr 22, 2015 at 2:26 pm
  • Hello, As part of using this for our project one of our teams need PHP driver for cassandra. the datastax page says its in ALPHA, is there some release candidate that people have used or any way to ...
    Anishek AgarwalAnishek Agarwal
    Apr 10, 2015 at 12:48 pm
    Apr 13, 2015 at 4:28 am
  • Hi, We too got the same error. Use cassandra-stress shipped with cassandra 2.1.x to run the test like that. Regards Abhinav
    Abhinav RanjanAbhinav Ranjan
    Apr 2, 2015 at 9:34 am
    Apr 7, 2015 at 5:47 pm
  • Hi, I am using Cassandra 2.0.13. Which is the recommended PHP driver I can use with this version of Cassandra? Regards, Amlan
    Amlan RoyAmlan Roy
    Apr 7, 2015 at 8:19 am
    Apr 7, 2015 at 5:42 pm
  • Hi, we are running test cassandra cluster of 8 nodes running in single DC using Simple snitch and DateTieredCompactionStrategy after adding new node(9th) to the cluster we see that number of sstables ...
    Mantas KlasavičiusMantas Klasavičius
    Apr 3, 2015 at 11:58 am
    Apr 5, 2015 at 5:13 am
  • I have cassandra 2.1 + OpsCenter 5.1.1 and test them. When I monitored with opscenter 'read requests' graph, it seems the number on the graph is not what I expected, the number of client requests or ...
    Bongseo JangBongseo Jang
    Apr 23, 2015 at 8:35 am
    May 1, 2015 at 12:56 pm
  • Hi We have a 2 Cluster Node with RF=2. We are planing to add a new node. Should we change RF to 3 in the schema? OR Just added a new node with the same RF=2? Any other Best Practice that we need to ...
    Neha TrivediNeha Trivedi
    Apr 27, 2015 at 3:46 pm
    Apr 29, 2015 at 3:40 am
  • Hi, are Cassandra and Spark from Cloudera compatible? Where can I find these compatilibity notes?
    Serega SheypakSerega Sheypak
    Apr 22, 2015 at 1:43 pm
    Apr 22, 2015 at 6:35 pm
  • Hi, I have a table of 300,000 rows. When I try to do a simple cqlsh:ase select count(1) from t; OperationTimedOut: errors={}, last_host= Appreciate any feedback Thanks, Mich NOTE: The ...
    Mich TalebzadehMich Talebzadeh
    Apr 22, 2015 at 9:25 am
    Apr 22, 2015 at 2:25 pm
  • Hi all, Currently we are setting up a “big” data cluster, but we are only going to have a couple of servers to start with but we need to be able to scale out quickly when usage ramps up. Previously ...
    Matthew JohnsonMatthew Johnson
    Apr 22, 2015 at 11:42 am
    Apr 22, 2015 at 2:23 pm
  • Hi all, In the near future I'll need to add more than 10 nodes to a 2.0.9 cluster (using vnodes). I read this documentation on datastax website ...
    Or SherOr Sher
    Apr 20, 2015 at 9:03 am
    Apr 20, 2015 at 3:10 pm
  • I read the document for several times, but I still not quite sure how to run repair and compaction. To my understanding, - I need to run compaction one each node, - To repair a table (column family), ...
    Benyi WangBenyi Wang
    Apr 13, 2015 at 8:36 pm
    Apr 14, 2015 at 5:43 pm
  • Hello, We have only on CF as CREATE TABLE t1(id bigint, ts timestamp, definition text, primary key (id, ts)) with clustering order by (ts desc) and gc_grace_seconds=0 and compaction = {'class' ...
    Anishek AgarwalAnishek Agarwal
    Apr 9, 2015 at 6:32 am
    Apr 13, 2015 at 4:16 am
  • Hi, What are the guidelines on when to use STCS/DTCS/LCS?. Most preferred way to test it with each of them and find the best fit. But is there some guidelines or best practices (out of experience) ...
    Apr 9, 2015 at 5:11 am
    Apr 9, 2015 at 4:15 pm
  • Hi, I try to understand how to Cassandra supports data consistency and compare it with other distributed caches. Hazelcast and Apache Ignite products have primary and backups. This approach allows to ...
    Nikolay TikhonovNikolay Tikhonov
    Apr 29, 2015 at 3:57 pm
    Apr 30, 2015 at 2:43 pm
  • Hi guys, We have some issues with streaming in 2.1.2. We find that there are a lot of patches in 2.1.5. Is it ready for upgrade? Thanks. -- Dikang
    Dikang GuDikang Gu
    Apr 21, 2015 at 9:28 pm
    Apr 22, 2015 at 7:00 pm
  • Hi all, I have set up a Cassandra cluster with 2.1.4 on some existing AWS boxes, just as a POC. Cassandra servers connect to each other over their internal AWS IP addresses (172.x.x.x) aliased in ...
    Matthew JohnsonMatthew Johnson
    Apr 20, 2015 at 4:47 pm
    Apr 21, 2015 at 12:04 pm
  • I ran "nodetool repair -- keyspace table" for a table, and it is still running after 4 days. I knew there is an issue for repair with vnodes https://issues.apache.org/jira/browse/CASSANDRA-5220. My ...
    Benyi WangBenyi Wang
    Apr 15, 2015 at 10:16 pm
    Apr 16, 2015 at 5:30 pm
  • Hi Guys, I truncated a column family that has a size of 31 gb, and the disk space was not released what else do i have to do? Regards Eduardo
    Eduardo CusaEduardo Cusa
    Apr 9, 2015 at 1:56 pm
    Apr 9, 2015 at 4:01 pm
  • I run a 10-node Cassandra cluster in production. 99% writes; 1% reads, 0% deletes. The nodes have 32 GB RAM; C* runs with 8 GB heap. Each node has a SDD for commitlog and 2x4 TB spinning disks for ...
    Thomas Borg SallingThomas Borg Salling
    Apr 8, 2015 at 8:37 am
    Apr 9, 2015 at 3:31 am
  • Hi all - We currently have a single cassandra cluster that is dedicated to a relatively narrow purpose, with just 2 tables. Soon we will need cassandra for another, unrelated, system, and my debate ...
    Ian RoseIan Rose
    Apr 2, 2015 at 1:07 pm
    Apr 2, 2015 at 4:52 pm
  • Hi guys, We have a 100+ nodes cluster, each node has about 400G data, and is running on a flash disk. We are running 2.1.2. When I bring in a new node into the cluster, it introduces significant load ...
    Dikang GuDikang Gu
    Apr 21, 2015 at 1:11 am
    Apr 21, 2015 at 5:54 pm
  • Hello, I am wondering how the actual read happens in Cassandra with Updates happening to data over time such that its in multiple SST Tables. As far as i can gather from the documentation, SST Table ...
    Anishek AgarwalAnishek Agarwal
    Apr 10, 2015 at 12:25 pm
    Apr 13, 2015 at 12:57 pm
  • Hi all, we are thinking of how to best proceed with availability testing of Cassandra nodes. It is becoming more and more apparent that it is rather complex task. We thought that we should try to ...
    Jiri HorkyJiri Horky
    Apr 8, 2015 at 2:31 pm
    Apr 9, 2015 at 12:51 pm
  • Hi! We have 56 node cluster with C* 2.0.13 + CASSANDRA-9036 patch installed. Assume we have nodes A, B, C, D, E. On some irregular basis one of those nodes starts to report that subset of other nodes ...
    Marcin PietraszekMarcin Pietraszek
    Apr 2, 2015 at 10:06 am
    Apr 8, 2015 at 7:02 am
  • Hi All, We want to track active queries on cassandra cluster. Is there any tool or way to find all active queries on cassandra ? Regards: Rahul Bhardwaj -- Follow IndiaMART.com ...
    Rahul BhardwajRahul Bhardwaj
    Apr 17, 2015 at 7:24 am
    Jun 1, 2015 at 5:57 pm
  • Hi, I am a newbie with Cassandra and thus need data modelling help as I haven't found a resource that tackles the same problem. The user case is similar to an email-system. I want to store a timeline ...
    Sandeep GuptaSandeep Gupta
    Apr 27, 2015 at 6:47 pm
    May 4, 2015 at 5:29 pm
  • Hi All, We are planning to set up a cluster of 5 nodes with RF 3 for write heavy project, our current database size is around 500 GB. And it is growing at rate of 15 GB every day. We learnt that ...
    Rahul BhardwajRahul Bhardwaj
    Apr 30, 2015 at 4:21 am
    Apr 30, 2015 at 9:57 am
  • Hi, Is there any minimum bandwidth requirement between two Geo Redundant data centres? What is the minimum latency that link between two Geo Redundant data centres should have to get best efficient ...
    Gaurav BhatnagarGaurav Bhatnagar
    Apr 28, 2015 at 3:30 am
    Apr 29, 2015 at 10:37 am
  • Using 2.1.4, tables in our data/ directory are showing up as our_table-147a2090ed4211e480153bc81e542ebd/ instead of as our_table/ Why would that happen? We're also seeing lagging compactions and high ...
    Donald SmithDonald Smith
    Apr 29, 2015 at 5:05 am
    Apr 29, 2015 at 10:13 am
  • Hey, I'm looking at querying around 500,000 rows that I need to pull into a Pandas data frame for processing. Currently testing this on a single cassandra node it takes around 21 seconds ...
    John AndersonJohn Anderson
    Apr 22, 2015 at 7:39 am
    Apr 22, 2015 at 1:48 pm
  • Hi, I am keep getting following line in the cassandra logs, apparently something related to Garbage Collection. And I guess this is one of the signs why i do not get any response (i get time-out) ...
    Apr 20, 2015 at 4:29 pm
    Apr 22, 2015 at 12:27 pm
  • Hi, I have a table of 300,000 rows. When I try to do a simple cqlsh:ase select count(1) from t; OperationTimedOut: errors={}, last_host= Appreciate any feedback Thanks, Mich NOTE: The ...
    Mich TalebzadehMich Talebzadeh
    Apr 22, 2015 at 9:41 am
    Apr 22, 2015 at 10:17 am
  • Back in 2.0.4 or 2.0.5 I ran into a problem with delete-only workloads. If I did lots of deletes and no upserts, Cassandra would report that the memtable was 0 bytes because an accounting error. The ...
    Robert WilleRobert Wille
    Apr 13, 2015 at 4:22 pm
    Apr 15, 2015 at 12:45 pm
  • Hi, I am trying to query a table from cqlsh and I get the following error: Request did not complete within rpc_timeout. I found the following messages in system.log: system.log:ERROR [ReadStage:1493] ...
    Amlan RoyAmlan Roy
    Apr 11, 2015 at 8:32 pm
    Apr 11, 2015 at 11:02 pm
  • Hey guys, We're running Cassandra with two data directories, let's say /data/sstables1 and /data/sstables2, which are in fact two separate (but identical) disks. The problem is that the disk where ...
    Roman TkachenkoRoman Tkachenko
    Apr 10, 2015 at 11:00 pm
    Apr 10, 2015 at 11:53 pm
  • I know this list isn't the right place to discuss driver issues in general, but I thought I'd offer a word of warning to anyone still using Astyanax related to an issue we ran into over the weekend ...
    Eric StevensEric Stevens
    Apr 3, 2015 at 6:19 pm
    Apr 4, 2015 at 2:20 am
  • Hi, I have 2 cassandra clusters. cluster1 is datastax community 2.1 cluster2 is datastax DSE I can run sstableloader from cluster1(Community) and stream data to cluster2 (DSE) But I get exception ...
    Serega SheypakSerega Sheypak
    Apr 1, 2015 at 12:54 pm
    Apr 1, 2015 at 7:08 pm
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133 users for April 2015

Robert Coli: 35 posts Anuj Wadehra: 26 posts Serega Sheypak: 24 posts Anishek Agarwal: 23 posts Matthew Johnson: 15 posts Sebastian Estevez: 15 posts Jon Haddad: 13 posts Ali Akhtar: 12 posts Neha Trivedi: 10 posts Amlan Roy: 9 posts Brice Dutheil: 9 posts Robert Wille: 9 posts Carlos Rolo: 8 posts Jack Krupansky: 8 posts Benyi Wang: 7 posts Daemeon reiydelle: 7 posts Eric Stevens: 7 posts Graham Sanderson: 6 posts Laing, Michael: 6 posts Brian O'Neill: 5 posts
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