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86 discussions - 382 posts

  • I have a need to be able to use the text of a document as the primary key in a table. These texts are usually less than 1K, but can sometimes be 10’s of K’s in size. Would it be better to use a ...
    Robert WilleRobert Wille
    Apr 11, 2016 at 10:04 pm
    Apr 23, 2016 at 8:51 am
  • Hi there, So we have 2 datacenter with 3 nodes each. Replication factor is 3 per DC (so each node has all data) We have an application in each DC that writes that Cassandra DC. Now, due to a miss ...
    Walsh, StephenWalsh, Stephen
    Apr 13, 2016 at 1:24 pm
    Apr 14, 2016 at 12:30 pm
  • Hi, We have a small 5 node cluster of m4.xlarge clients that receives writes from ~20 clients. The clients will write as fast as they can, and the whole process is limited by the write performance of ...
    Bo Finnerup MadsenBo Finnerup Madsen
    Apr 20, 2016 at 1:39 pm
    Apr 25, 2016 at 8:18 am
  • Hi, This is Jason. Currently, I am using C* 2.1.10, I want to ask what's the optimal number of tables I should create in one cluster? My use case is that I will prepare a keyspace for each of my ...
    Jason zhao yangJason zhao yang
    Apr 4, 2016 at 2:18 pm
    Apr 7, 2016 at 2:26 am
  • Hi, We have 2.0.14. We use RF=3 and read/write at Quorum. Moreover, we dont use incremental backups. As per the documentation at ...
    Anuj WadehraAnuj Wadehra
    Apr 26, 2016 at 2:26 am
    Apr 29, 2016 at 8:12 am
  • Hi, I am trying to replace a dead node with by following https://docs.datastax.com/en/cassandra/2.0/cassandra/operations/ops_replace_node_t.html. It's been 3 full days since the replacement node ...
    Mir Tanvir HossainMir Tanvir Hossain
    Apr 21, 2016 at 5:02 pm
    Apr 22, 2016 at 2:14 am
  • Based on a recent inquiry and a recent thread of my own, and the coming support for wide rows, I'll focus in on this question that I feel needs better documentation of recommended best practice: When ...
    Jack KrupanskyJack Krupansky
    Apr 18, 2016 at 4:16 pm
    Apr 19, 2016 at 9:57 pm
  • hello, we have 8 nodes in one cluster and attached is the traffic patterns across the nodes. its very surprising that only 4 nodes show transmitting (purple) packets. our driver configuration on ...
    Anishek AgarwalAnishek Agarwal
    Apr 12, 2016 at 7:00 am
    Apr 19, 2016 at 3:26 pm
  • Hi We are on 2.0.14 and Thrift. We are planning to migrate to CQL soon but facing some challenges. We have a cf with a mix of statically defined columns and dynamic columns (created at run time). For ...
    Anuj WadehraAnuj Wadehra
    Apr 10, 2016 at 6:09 pm
    Apr 12, 2016 at 4:35 am
  • I'm afraid I don't have the solid answer to this obvious question: How do I get a fairly accurate count of (CQL) rows in a Cassandra table? Does SELECT COUNT (*) FROM <table-name actually do it? Does ...
    Jack KrupanskyJack Krupansky
    Apr 8, 2016 at 10:48 pm
    Apr 11, 2016 at 4:15 pm
  • Hi everyone We are having problems with our cluster (7 nodes version 2.0.17) when running "massive deletes" on one of the nodes (via cql command line). At the beginning everything is fine, but after ...
    Paco TrujilloPaco Trujillo
    Apr 4, 2016 at 12:34 pm
    Apr 11, 2016 at 7:13 am
  • Hello, We currently have 3 Cassandra servers running in a single datacenter with a replication factor of 3 for our keyspace. We also use the SimpleSnitch wiith DynamicSnitching enabled by default ...
    Mukil KesavanMukil Kesavan
    Apr 3, 2016 at 3:06 am
    Apr 5, 2016 at 10:53 pm
  • Hi , I had few question related to Single Node Setup in Cassandra 1) We want to install Cassandra but multiple Node is not what we need Can we proceed with Single Node and store millions of data in ...
    Bhupendra BaraiyaBhupendra Baraiya
    Apr 6, 2016 at 1:45 pm
    Apr 7, 2016 at 2:40 pm
  • Hi, Is it possible to use DataStax OpsCenter for monitoring Apache distributed Cassandra in Production? OR Is it possible to use DataStax OpsCenter if you are not using DataStax Enterprise in ...
    Anuj WadehraAnuj Wadehra
    Apr 10, 2016 at 4:28 pm
    May 4, 2016 at 2:10 am
  • Hi, I dont know, if someone has faced this problem or not. I am running a job where some data is loaded from cassandra table. From that data, i make some insert and delete statements. and execute it ...
    Siddharth VermaSiddharth Verma
    Apr 27, 2016 at 5:42 pm
    Apr 28, 2016 at 8:33 am
  • Does anybody here have any experience, positive or negative, with deploying Cassandra (or DSE) clusters using Kubernetes? I don't have any immediate need (or experience), but I am curious about the ...
    Jack KrupanskyJack Krupansky
    Apr 14, 2016 at 2:13 pm
    Apr 18, 2016 at 7:12 pm
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    Vitaly SourikovVitaly Sourikov
    Apr 11, 2016 at 7:43 am
    Apr 12, 2016 at 2:11 pm
  • Hi We have a 3 node cluster of 2.0.14. We use Read/Write Qorum and RF is 3. We want to move data and commitlog directory from a SATA HDD to SSD. We have planned to do a rolling upgrade. We plan to ...
    Anuj WadehraAnuj Wadehra
    Apr 23, 2016 at 7:05 pm
    Apr 26, 2016 at 9:49 am
  • Hi all, I am running a 9 node C* 2.1.12 cluster. I seek advice in data size per node. Each of my node has close to 1 TB of data. I am not seeing any issues as of now but wanted to run it by you guys ...
    Aiman ParvaizAiman Parvaiz
    Apr 14, 2016 at 8:57 am
    Apr 14, 2016 at 6:25 pm
  • Hi everyone, Last week I ran some tests to estimate the latency overhead introduces in a Cassandra cluster by a multi availability zones setup on AWS EC2. I started a Cassandra cluster of 6 nodes ...
    Alessandro PieriAlessandro Pieri
    Apr 11, 2016 at 12:57 pm
    Apr 12, 2016 at 11:23 pm
  • Hi there, I am wondering if it is possible to disable compaction when all my data are read-only?
    Yatong ZhangYatong Zhang
    Apr 8, 2016 at 9:42 am
    Apr 9, 2016 at 11:12 am
  • I have a paging model whereby we stream data from CS by fetching 'pages' thereby reading (sequentially) entire datasets. We're using the bucket approach where we write data for 5 minutes, then we can ...
    Kevin BurtonKevin Burton
    Apr 7, 2016 at 5:03 pm
    Apr 9, 2016 at 6:56 am
  • Hi, I am provisioning a new datacenter for an existing cluster. A rather shaky VPN connection is hindering me from making a "nodetool rebuild" bootstrap on the new DC. Interestingly, I have a full ...
    Jens RantilJens Rantil
    Apr 18, 2016 at 8:15 am
    Apr 25, 2016 at 8:24 am
  • Hi, I have a wide row index table so that I can fetch all row keys corresponding to a column value. Row of index_table will look like: ColValue1:bucket1 rowkey1, rowkey2. ...
    Anuj WadehraAnuj Wadehra
    Apr 22, 2016 at 2:57 pm
    Apr 24, 2016 at 6:07 pm
  • Hi, Im trying to copy a 20 GB CSV file into a 3 node fresh cassandra cluster with 32 GB memory each, sufficient disk, RF-1 and durable write false. The machine im feeding into is external to the ...
    Bhuvan RawalBhuvan Rawal
    Apr 22, 2016 at 10:34 pm
    Apr 24, 2016 at 4:35 am
  • According to this Oracle document, GCLocker Initiated GC is triggered when a JNI critical region was released. GC is blocked when any thread is in the JNI Critical region. If GC was requested during ...
    Sotirios DelimanolisSotirios Delimanolis
    Apr 21, 2016 at 5:54 pm
    Apr 21, 2016 at 6:08 pm
  • Hey Guys, Is there a way to make TLS encryption optional for the CQL listener? We'd like to be able to use for remote management connections but not for same datacenter usage (since the build/up tear ...
    Jason J. W. WilliamsJason J. W. Williams
    Apr 19, 2016 at 10:32 pm
    Apr 20, 2016 at 9:20 am
  • Hi, I am new to Cassandra. I am wondering how well does Cassandra perform in e-commerce applications that have large taxonomies for products with many user searchable product attributes; when many ...
    Gross, DanielGross, Daniel
    Apr 13, 2016 at 12:07 am
    Apr 13, 2016 at 2:44 am
  • I am looking for way to optimize large reads. I have seen using SSD is a good option but out of budget, so I am looking for a way to use some kind of tiering with few SSD caching hot data from HDD. I ...
    Vincent gromakowskiVincent gromakowski
    Apr 1, 2016 at 11:16 am
    Apr 3, 2016 at 7:28 pm
  • hi; we are upgrading our cluster from apache-cassandra 2.0.14 to 2.0.17. We have been facing SYN flooding issue (port 9042) in our current version of Cassandra at times. We are hoping to tackle the ...
    Sai krishnam raju potturiSai krishnam raju potturi
    Apr 5, 2016 at 2:58 pm
    May 11, 2016 at 3:38 pm
  • Hi All, I have cluster of 7 nodes completely balanced (each node owns ~500GB of data). And I have one keyspace and one table and three replicas. Than, I just failed one node's disk, replace it with a ...
    Apr 25, 2016 at 10:06 pm
    Apr 26, 2016 at 12:48 pm
  • Hi guys. I've been struggling for the last days to find a reliable and stable way to count keys in a thrift column family. My idea is to basically iterate the whole ring using the token function, as ...
    Carlos AlonsoCarlos Alonso
    Apr 21, 2016 at 3:59 pm
    Apr 25, 2016 at 1:49 pm
  • Is it possible to do this without down time i.e. run in mixed mode while doing a rolling upgrade?
    Apr 24, 2016 at 12:23 pm
    Apr 25, 2016 at 10:40 am
  • Hey Folks, I've been looking through various documentations, but I'm either overlooking something obvious or not wording it correctly, but the gist of my problem is this: I have two cassandra ...
    Arlington AlbertsonArlington Albertson
    Apr 21, 2016 at 11:15 pm
    Apr 25, 2016 at 7:48 am
  • Hi, I'm wondering if someone could help me, I'd like to use cassandra to store data and publish this on dowstream to another database (kdb if anyone is interested). Essentially I'd like to be able to ...
    Alexander OrrAlexander Orr
    Apr 24, 2016 at 2:51 pm
    Apr 24, 2016 at 6:18 pm
  • Hi! I have this problem where 3 of my 84 nodes misbehave with too long GC times, leading to them being marked as DN. This happens when I load data to them using CQL from a hadoop job, so quite a lot ...
    Erik ForsbergErik Forsberg
    Apr 19, 2016 at 12:24 pm
    Apr 21, 2016 at 12:21 pm
  • Hi, It looks like to me that DataStax doesn't provide official golang driver yet and the goland client libs are overall lagging behind the Java driver in terms of feature set, supported version and ...
    Yawei LiYawei Li
    Apr 13, 2016 at 5:06 am
    Apr 14, 2016 at 9:42 pm
  • I got this compaction error when running 'nodetool upgradesstable -a' while upgrading from 2.1.9 to 3.0.2. According to documentation this upgrade should work. Would upgrading to another intermediate ...
    Anthony VersluesAnthony Verslues
    Apr 13, 2016 at 9:37 pm
    Apr 14, 2016 at 9:13 pm
  • I have a table mapping continuous ranges to discrete values. CREATE TABLE range_mapping (k int, lower int, upper int, mapped_value int, PRIMARY KEY (k, lower, upper)); INSERT INTO range_mapping (k, ...
    Peer, OdedPeer, Oded
    Apr 7, 2016 at 8:37 am
    Apr 10, 2016 at 6:34 am
  • Hi, I have configured new DC as per instructions at below link. https://docs.datastax.com/en/cassandra/2.0/cassandra/operations/ops_add_dc_to_cluster_t.html After completing step 7.a (which is ...
    Vijay PatilVijay Patil
    Apr 5, 2016 at 6:26 am
    Apr 6, 2016 at 4:09 am
  • hi, I am facing an issue where Solr queries executed from cqlsh using the solr_query field is throwing an NPE in system.log, while cqlsh shows the following error: Unable to complete request: one or ...
    Joseph TechJoseph Tech
    Apr 12, 2016 at 10:07 am
    May 9, 2016 at 8:25 am
  • We are running Cassandra 2.2.3, 2 data centers, 3 nodes in each. The replication factor per datacenter is 3. The Xmx setting on the Cassandra JVMs is 4GB. We have a workload that generates loots of ...
    Rick GundersonRick Gunderson
    Apr 28, 2016 at 5:23 pm
    May 3, 2016 at 7:04 pm
  • Hi, We are using cassandra(dsc3.0.3) on production. For some purpose, we were doing a full table scan (setPagingState and getPagingState used on ResultSet in java program), and there has been some ...
    Siddharth VermaSiddharth Verma
    Apr 19, 2016 at 3:25 pm
    Apr 28, 2016 at 8:08 am
  • Hi, I am trying to run nodetool remotely. but its not working: I am running Cassandra 2.2.5 on CentOS 6. listen_address: is set to <host IP rpc_address: is set to broadcast_rpc_address: is ...
    Alaa Zubaidi (PDF)Alaa Zubaidi (PDF)
    Apr 19, 2016 at 7:40 pm
    Apr 20, 2016 at 9:44 pm
  • Hi, could anyone please tell me whether is it possible to remove an existing node from cluster while another node is joining the same cluster? Thanks, Mir
    Mir Tanvir HossainMir Tanvir Hossain
    Apr 18, 2016 at 6:01 pm
    Apr 19, 2016 at 9:00 pm
  • Hi, We are running a 6 node cassandra 2.2.4 cluster and we are seeing a spike in the disk Load as per the ‘nodetool status’ command that does not correspond with the actual disk usage. Load reported ...
    Apr 14, 2016 at 11:28 pm
    Apr 18, 2016 at 3:42 am
  • Hi Team, Help required cassandra:/app/cassandra $ nodetool status Cassandra 2.0 and later require Java 7u25 or later. cassandra:/app/cassandra $ nodetool status Cassandra 2.0 and later require Java ...
    Lokesh Ceeba - VendorLokesh Ceeba - Vendor
    Apr 11, 2016 at 4:08 pm
    Apr 16, 2016 at 10:41 pm
  • Hello, Is it a correct statement that both rebuild and bootstrap resume streaming from where they were left off (meaning they don't stream the entire data again) in case of node restarting during ...
    Anubhav KaleAnubhav Kale
    Apr 14, 2016 at 10:08 pm
    Apr 15, 2016 at 1:07 am
  • Hi, all We have been a Cassandra 4-node cluster (C* 1.2.x) where a node marked all the other 3 nodes DOWN, and came back UP a few seconds later. There was a compaction that kicked in a minute before, ...
    Michael FongMichael Fong
    Apr 13, 2016 at 8:58 am
    Apr 14, 2016 at 7:16 am
  • Hello, Since we upgraded to Cassandra 2.1.12, we are noticing that below happens when we are trying to bootstrap nodes, and the process just gets stuck. Restarting the process / VM does not help. Our ...
    Anubhav KaleAnubhav Kale
    Apr 13, 2016 at 8:38 pm
    Apr 13, 2016 at 11:06 pm
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128 users for April 2016

Jack Krupansky: 27 posts Alain RODRIGUEZ: 22 posts Anuj Wadehra: 18 posts Anubhav Kale: 10 posts Jens Rantil: 9 posts Paco Trujillo: 9 posts Jonathan Haddad: 7 posts Mir Tanvir Hossain: 7 posts Siddharth Verma: 7 posts Tyler Hobbs: 7 posts Sean_r_durity: 6 posts Anishek Agarwal: 6 posts Bo Finnerup Madsen: 6 posts Bryan Cheng: 6 posts Carlos Alonso: 6 posts Jason Williams: 6 posts Jeff Jirsa: 6 posts Bhuvan Rawal: 5 posts Carlos Rolo: 5 posts Eric Stevens: 5 posts
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