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126 discussions - 528 posts

  • Hi All. We have a scenario, where till now we had been using a plain, simple single node, with the keyspace created using :: CREATE KEYSPACE our_db WITH replication = {'class': 'SimpleStrategy', ...
    Ajay GargAjay Garg
    Oct 7, 2015 at 3:57 pm
    Oct 25, 2015 at 1:20 pm
  • How the two things can fit together? Cassandra endorses the AP side of the CAP theorem. So how Cassandra can deliver realtime consistent data? AFAIK, choosing a consistency level equals to ALL can be ...
    Renato PeriniRenato Perini
    Oct 8, 2015 at 11:17 pm
    Oct 11, 2015 at 11:10 pm
  • If a node in the cluster goes down and comes up, the data gets synced up on this downed node. Is there a limit on the interval for which the node can remain down? Or the data will be synced up even ...
    Ajay GargAjay Garg
    Oct 24, 2015 at 6:49 am
    Oct 29, 2015 at 10:38 pm
  • We just migrated from a 30 node cluster to a 45 node cluster. (so 15 new nodes) By default we have auto_boostrap = false so we just push our config to the cluster, the cassandra daemons restart, and ...
    Kevin BurtonKevin Burton
    Oct 17, 2015 at 5:45 pm
    Oct 20, 2015 at 8:56 pm
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    Alessandro oggianuAlessandro oggianu
    Oct 14, 2015 at 12:19 pm
    Oct 30, 2015 at 3:40 am
  • hi; would unsafeassasinating a dead node maintain the replication factor like decommission process or removenode process? thanks
    Sai krishnam raju potturiSai krishnam raju potturi
    Oct 31, 2015 at 12:13 pm
    Nov 1, 2015 at 12:34 pm
  • Hi, so we are developing a system that computes profile of things that it observes. The observation comes in form of events. Each thing that it observe has an id and each thing has a set of subthings ...
    Nazario ParsacalaNazario Parsacala
    Oct 8, 2015 at 9:28 pm
    Oct 10, 2015 at 9:42 am
  • Is cassandra really supposed to have a static public IP for each and single node in the cluster? This seems to be expensive (static IPs are nor free neither cheap), still the broadcast_rpc_address ...
    Renato PeriniRenato Perini
    Oct 4, 2015 at 9:59 pm
    Oct 6, 2015 at 4:03 pm
  • Hi Guys, I am some problems of Connection Timeout in a random mode, that is, the application in python that I am using sometimes it does work very well sometimes not, I am getting this error ...
    Eduardo AlfaiaEduardo Alfaia
    Oct 28, 2015 at 11:22 pm
    Oct 29, 2015 at 3:28 pm
  • Hi, We are looking for data visualization tools to chart some graphs over data present in our cassandra cluster. Are there any open source visualization tools that people are using to quickly draw ...
    Vikram KoneVikram Kone
    Oct 20, 2015 at 5:00 pm
    Oct 20, 2015 at 7:46 pm
  • Is it safe to make schema changes ( e.g. create keyspace and tables ) on multiple separate nodes of a cluster while they are out of communication with other nodes in the cluster? For example create ...
    Stephen BaynesStephen Baynes
    Oct 2, 2015 at 2:45 pm
    Oct 5, 2015 at 12:54 pm
  • Using DSE 4.8.1 /, Java version 1.8.0_66 We upgraded our cluster this weekend and have been having issues with dropped mutations since then. Intensely investigating a single node and ...
    Jeff FerlandJeff Ferland
    Oct 30, 2015 at 1:12 am
    Nov 3, 2015 at 12:14 am
  • some nodes seems normal ,but some nodes do't. here is the metrics from opscenter: [image: 内嵌图片 1] [image: 内嵌图片 2] [image: 内嵌图片 3] -------------------------------------- Ranger Tsao
    Oct 23, 2015 at 11:13 am
    Nov 2, 2015 at 11:57 am
  • Hi, Oracle Timestamp data type supports fractional seconds (upto 9 digits, 6 is default). What is the Cassandra equivalent data type for Oracle TimeStamp nanosecond precision. This is required for ...
    Chandrasekar KrcChandrasekar Krc
    Oct 29, 2015 at 11:10 am
    Oct 29, 2015 at 11:23 pm
  • INFO [Service Thread] 2015-10-20 10:42:47,854 GCInspector.java:252 - ParNew GC in 476ms. CMS Old Gen: 4288526240 - 4725514832; Par Eden Space: 671088640 - 0; INFO [Service Thread] 2015-10-20 ...
    Oct 20, 2015 at 4:40 am
    Oct 21, 2015 at 9:41 am
  • Hi, We are running Cassandra 2.2.1 on Windows 2008R2, and we see that multiple Nodes are stuck at 99% CPU bringing the whole VM to a halt. We suspect that there is another process that IT/Windows is ...
    Alaa Zubaidi (PDF)Alaa Zubaidi (PDF)
    Oct 16, 2015 at 1:05 am
    Oct 28, 2015 at 12:52 am
  • Hi, I've read all I could find on how cassandra works, I'm still wondering why the following query takes more than 5s to return on a simple (and modest) 3 nodes cassandra 2.1.9 cluster: SELECT ...
    Brice FigureauBrice Figureau
    Oct 17, 2015 at 3:15 pm
    Oct 21, 2015 at 1:48 pm
  • We're in the middle of migrating datacenters. We're migrating from 13 nodes to 30 nodes in the new datacenter. The plan was to bootstrap the 30 nodes first, wait until they have joined. then we're ...
    Kevin BurtonKevin Burton
    Oct 6, 2015 at 7:32 pm
    Oct 6, 2015 at 11:03 pm
  • Hi all, The docs indicate that memtables are triggered to flush when data in the commitlog is expiring or based on memtable_flush_period_in_ms. But LCS has a specified sstable size; when using LCS ...
    Dan KinderDan Kinder
    Oct 27, 2015 at 8:42 pm
    Nov 2, 2015 at 7:22 pm
  • Hi, I saw Cassandra documentation. http://docs.datastax.com/en/cassandra/2.1/cassandra/security/secureSSLCertificates_t.html I found this line "SSL certificates must be generated using keytool". Can ...
    Vishwajeet SinghVishwajeet Singh
    Oct 29, 2015 at 7:06 am
    Oct 30, 2015 at 12:06 am
  • Hi Guys, Does anyone know what error code in cassandra is? Error decoding response from Cassandra. opcode: 0008; Thanks
    Eduardo AlfaiaEduardo Alfaia
    Oct 29, 2015 at 1:46 pm
    Oct 29, 2015 at 3:38 pm
  • Searching for a well established company that can provide consulting and operations support for private multi-dc production Cassandra cluster on Windows OS. New project. OS is hosting mandate. Troy ...
    Troy CollinsworthTroy Collinsworth
    Oct 27, 2015 at 1:58 pm
    Oct 28, 2015 at 7:08 pm
  • Hi All: We have a table defined only one partition key and some cluster key. CREATE TABLE test1 ( attribute text, partner text, app text, "timestamp" bigint, event text, PRIMARY KEY ((attribute), ...
    Oct 22, 2015 at 1:19 am
    Oct 27, 2015 at 1:26 pm
  • I have removed a node with nodetool removenode, which completed ok. Nodetool status does not list the node anymore. But since then, Im seeing messages in my other nodes log files referring to the ...
    Tom van den BergeTom van den Berge
    Oct 14, 2015 at 11:27 am
    Oct 15, 2015 at 6:42 am
  • When I run the query "SELECT image FROM roll WHERE roll = :roll“ against this table CREATE TABLE roll ( roll INT, image BIGINT, data VARCHAR static, mid VARCHAR, imp_st VARCHAR, PRIMARY KEY ((roll), ...
    Robert WilleRobert Wille
    Oct 2, 2015 at 10:58 pm
    Oct 8, 2015 at 7:11 pm
  • Hi, Did anybody took the Cassandra (Administrator) certification on the Summit? Any feedback? How was the test? Thanks Ruben
    Fernandez Gomara, Ruben (CCI-Atlanta)Fernandez Gomara, Ruben (CCI-Atlanta)
    Oct 1, 2015 at 2:00 pm
    Oct 5, 2015 at 5:18 pm
  • I'm doing a big nodetool repair right now and I'm pretty sure the added overhead is impacting our performance. Shouldn't you be able to throttle repair so that normal compactions can use most of the ...
    Kevin BurtonKevin Burton
    Oct 19, 2015 at 12:18 am
    Oct 20, 2015 at 1:00 am
  • I've got an existing C* cluster spread across three data centers, and I'm wrestling with how to add some support for ad-hoc user reporting against (ideally) near real-time data. The type of reports I ...
    Mark LewisMark Lewis
    Oct 17, 2015 at 3:30 pm
    Oct 18, 2015 at 9:56 pm
  • Hi, I am running Cassandra 2.1.10 and noticed intermittent DirectoryNotEmptyExceptions during repair. My cassandra data drive is reiserfs. I noticed that on reiserfs wiki site ...
    Modha, DigantModha, Digant
    Oct 13, 2015 at 6:59 pm
    Oct 17, 2015 at 8:50 pm
  • We have recently created production ready Cassandra clusters and we are currently trying to create and implement a robust Backup/Restore process. We are hosting our Cassandra VMs in AWS and we ...
    Jason TurnerJason Turner
    Oct 12, 2015 at 3:52 pm
    Oct 13, 2015 at 2:41 am
  • hi; our cassandra cluster currently uses DSE 4.6. The underlying cassandra version is 2.0.14. We are planning on adding multiple nodes to one of our datacenters. This requires "nodetool cleanup". The ...
    Sai krishnam raju potturiSai krishnam raju potturi
    Oct 8, 2015 at 9:48 pm
    Oct 9, 2015 at 2:08 pm
  • Hi, I am trying to understand this error message that CQL is throwing when I try to update 2 different rows with different values on same conditional columns. Doesn't CQL support that? I am wondering ...
    Peddi, PraveenPeddi, Praveen
    Oct 8, 2015 at 8:13 pm
    Oct 8, 2015 at 8:52 pm
  • Hey all, First off, thank you for taking the time to read this. ------------------- SYSTEM SPEC ------------------- We're using Cassandra Version 2.1.6 (please don't ask us to upgrade just yet less ...
    Walsh, StephenWalsh, Stephen
    Oct 30, 2015 at 5:20 pm
    Nov 2, 2015 at 2:21 pm
  • Hi, Could you please suggest if Narrow partition is a good choice for the below use case. 1) Write heavy event log table with 50m inserts per day with a peak load of 20K transaction per sec. There ...
    Chandrasekar KrcChandrasekar Krc
    Oct 30, 2015 at 10:56 am
    Oct 30, 2015 at 5:13 pm
  • Hi, I am currently working on load testing my cluster. When we write 100000 to cassandra, where does the writes data gets stored in Cassandra and the same for read operation too. ./cassandra-stress ...
    Arun SanduArun Sandu
    Oct 30, 2015 at 4:07 am
    Oct 30, 2015 at 5:07 am
  • Hey everyone, I keep on seeing that there should be a 2 minute delay when bootstrapping a cluster, and I have few questions round that. For starters, is there any reasoning why this is 2min and not ...
    Lou KamenovLou Kamenov
    Oct 22, 2015 at 3:16 pm
    Oct 28, 2015 at 6:25 pm
  • I saw an average 10% cpu usage on each node when the cassandra cluster has no load at all. I checked which thread was using the cpu, and I got the following 2 metric threads each occupying 5% cpu ...
    Xu ZhongxingXu Zhongxing
    Oct 24, 2015 at 12:53 pm
    Oct 25, 2015 at 1:54 am
  • Hi, I use a timestamp column as the last clustering key so that I can run query like "timestamp ... AND timestamp < ...". But it doesn't work as expected. Here is a simplified example. My table ...
    Kai WangKai Wang
    Oct 23, 2015 at 3:55 pm
    Oct 23, 2015 at 5:48 pm
  • Hi, I am really new with Cassandra and i have some questions regarding the backup of Cassandra with TB of info. So please, forgive me if I ask a noob question. I only have one node, in one server ...
    Raul D'OpazoRaul D'Opazo
    Oct 20, 2015 at 11:22 am
    Oct 22, 2015 at 6:42 am
  • Hey all. We've been seeing this warning on one of our clusters: 2015-10-18 14:28:52,898 WARN [ValidationExecutor:14] org.apache.cassandra.db.context.CounterContext invalid global counter shard ...
    Branton DavisBranton Davis
    Oct 18, 2015 at 6:55 pm
    Oct 20, 2015 at 11:44 pm
  • Hi, I want to change the ip addresses (ip v4) that nodes use to discuss (gossip). I'm trying to migrate from ipv4 to ipv6 for those communications. I tried to follow a similar procedure as the one ...
    Cyril ScetbonCyril Scetbon
    Oct 19, 2015 at 1:59 am
    Oct 20, 2015 at 11:03 pm
  • If you had Cassandra 2.0.x (possibly before) and upgraded to Cassandra 2.1, you may have had commitlog_sync: batch commitlog_sync_batch_window_in_ms: 25 in you cassiandra.yaml It turned out that this ...
    Graham SandersonGraham Sanderson
    Oct 19, 2015 at 3:55 pm
    Oct 19, 2015 at 7:27 pm
  • Hi, suppose I have two data centers and want to coordinate a bunch of services in each data center (for example to load data into a per-DC system that is not DC-aware (Solr)). Does it make sense to ...
    Jan AlgermissenJan Algermissen
    Oct 15, 2015 at 2:47 pm
    Oct 16, 2015 at 4:00 pm
  • hi; we are deploying a new cluster with 2 datacenters, 48 nodes in each DC. For the system_auth keyspace, what should be the ideal replication_factor set? We tried setting the replication factor ...
    Sai krishnam raju potturiSai krishnam raju potturi
    Oct 15, 2015 at 5:25 pm
    Oct 16, 2015 at 3:11 pm
  • We are running Apache Cassandra 2.1.9. In one of our Column Family, we have MAP type column. We are seeing unusual data size of the column family (SSTables) with few 1000's of rows, while debugging, ...
    Saladi NaiduSaladi Naidu
    Oct 14, 2015 at 6:24 pm
    Oct 15, 2015 at 4:46 pm
  • Hello, I have a cassandra cluster from pre-cql era and I am having problems accessing data via cqlsh. As you can see below, I can not reach dynamic columns via cqlsh but they are accessible via ...
    Onur YalazıOnur Yalazı
    Oct 15, 2015 at 2:54 pm
    Oct 15, 2015 at 3:22 pm
  • Hi, has anyone started to use G1 collector. If so, how is the experience. Can you share your insights into some of the important tune up you had to do for cassandra. We are planning to use G1 ...
    K FK F
    Oct 13, 2015 at 9:04 pm
    Oct 13, 2015 at 9:20 pm
  • Hello, I saw this nice link from an event ...
    Marcelo Valle (BLOOMBERG/ LONDON)Marcelo Valle (BLOOMBERG/ LONDON)
    Oct 9, 2015 at 1:09 pm
    Oct 9, 2015 at 6:56 pm
  • I find it really frustrating that nodetool status doesn't include a hostname Makes it harder to track down problems. I realize it PRIMARILY uses the IP but perhaps cassandra.yml can include an ...
    Kevin BurtonKevin Burton
    Oct 8, 2015 at 2:59 am
    Oct 9, 2015 at 1:15 pm
  • We had some problems with a node, so we decided to rebootstrap it. My IT guy screwed up, and when he added -Dcassandra.replace_address to cassandra-env.sh, he forgot the closing quote. The node ...
    Robert WilleRobert Wille
    Oct 8, 2015 at 3:28 pm
    Oct 9, 2015 at 1:09 pm
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131 users for October 2015

Robert Coli: 40 posts Ajay Garg: 19 posts Carlos Alonso: 18 posts Jon Haddad: 17 posts Sai krishnam raju potturi: 15 posts Kevin Burton: 14 posts Sebastian Estevez: 13 posts Graham Sanderson: 12 posts Kai Wang: 12 posts Qihuang.zheng: 12 posts 曹志富: 12 posts Eduardo Alfaia: 11 posts Jeff Jirsa: 11 posts Eric Stevens: 9 posts Nate McCall: 9 posts Tyler Hobbs: 9 posts Walsh, Stephen: 9 posts Alaa Zubaidi (PDF): 8 posts Michael Shuler: 8 posts Robert Wille: 8 posts
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