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73 discussions - 312 posts

  • I'm running some ETL jobs, where the pattern is the following: 1- Get some records from an external API, 2- For each record, see if its lastModified date the lastModified i have in db (or if I don't ...
    Ali AkhtarAli Akhtar
    May 13, 2015 at 10:27 am
    May 13, 2015 at 7:23 pm
  • Hi, I'd just like some clarity and advice regarding running multiple cassandra instances on a single large machine (big JBOD array, plenty of CPU/RAM). First, I am aware this was not Cassandra's ...
    Dan KinderDan Kinder
    May 21, 2015 at 5:33 pm
    May 26, 2015 at 4:08 pm
  • Good Day Everyone, I am very happy with the (almost) linear scalability offered by C*. We had a lot of problems with RDBMS. But, I heard that C* has a limit on number of column families that can be ...
    Arun ChaitanyaArun Chaitanya
    May 27, 2015 at 3:32 am
    Jun 24, 2015 at 6:39 pm
  • We've been running into the reused key cache issue (CASSANDRA-5202) with dropping and recreating the same table in Cassandra 1.2.18 so we've been testing with key caches disabled which does not seem ...
    Ken HancockKen Hancock
    May 21, 2015 at 2:32 pm
    May 26, 2015 at 3:06 pm
  • Hi, I need some info on Hbase vs Cassandra as a data store (in general plus specific to time series data). The comparison in the following helps: 1: features 2: deployment and monitoring 3 ...
    May 29, 2015 at 7:10 pm
    Jun 8, 2015 at 12:38 pm
  • Hello guys, I have a cassandra cluster = 2.1.0-2 comprised of 3 nodes. I successfully added the third node last week. After that, I ran nodetool cleanup on one of the other two nodes, and it finished ...
    Analia LorenzattoAnalia Lorenzatto
    May 15, 2015 at 5:17 pm
    May 15, 2015 at 10:31 pm
  • Hi - As I understand, the Spark SQL Thrift/JDBC server cannot be used with the open source C*. Only DSE supports the Spark SQL JDBC server. We would like to find out whether how many organizations ...
    Mohammed GullerMohammed Guller
    May 27, 2015 at 1:17 am
    Jun 3, 2015 at 3:44 pm
  • CQL is the future, and it provides a great high-level view of keyspaces. (I am drinking the Kool-Aid.) But, I believe every C* developer needs to also look at the table's internal structure, e.g., ...
    Moshe KrancMoshe Kranc
    May 13, 2015 at 7:28 pm
    May 26, 2015 at 2:37 pm
  • Hi All, We have cluster of 3 nodes with 64GB RAM each. My cluster was running in healthy state. Suddenly one machine's cassandra daemon stops working and shut down. On restarting it after 2 minutes ...
    Rahul BhardwajRahul Bhardwaj
    May 11, 2015 at 9:59 am
    May 13, 2015 at 1:08 am
  • Hello, I have an application that inserts multiple rows within a single partition (= all rows share the same partition key) using a BATCH statement. Is it possible that other clients can partially ...
    Martin KrasserMartin Krasser
    May 18, 2015 at 10:32 am
    May 19, 2015 at 8:53 am
  • Quick Question, Our team is under much debate, we are trying to find out if an Update on a row with a TTL will create a tombstone. E.G We have one row with a TTL, if we keep "updating" that row ...
    Walsh, StephenWalsh, Stephen
    May 13, 2015 at 10:34 am
    May 14, 2015 at 1:18 pm
  • Hi all, I have a question re leveled compaction strategy that has been bugging me quite a lot lately. Based on what I understood, a compaction takes place when the SSTable gets to a specific size (10 ...
    Stefano OrtolaniStefano Ortolani
    May 24, 2015 at 5:52 pm
    May 26, 2015 at 9:12 am
  • Hi, We experienced a crash on our production cluster following a massive wide row read. A client tried to read a wide row (~4GB of raw data) without specifying any slice condition, which resulted in ...
    Kévin LOVATOKévin LOVATO
    May 12, 2015 at 3:43 pm
    May 19, 2015 at 1:34 pm
  • Hi, Can somebody please share me details about setting up of EC2snitch in AWS single region which has availability zone 1a and 1b? I am using Cassandra version 1.2.19 in the setup. I would appreciate ...
    Kaushal ShriyanKaushal Shriyan
    May 27, 2015 at 4:32 pm
    May 29, 2015 at 11:25 am
  • Hey I'm new to Cassandra ,I have 4 node cluster with each node 16GB VPS, initially I had one seed node, I added one of the existing nodes as seed nodes , restarted nodes one by one after that one of ...
    Sachin PKSachin PK
    May 25, 2015 at 1:56 pm
    May 26, 2015 at 8:48 am
  • I have a specific update and query that I need to ensure has strong consistency. To that end, when I do the write, I set the consistency level to ALL. Shortly afterwards, I do a query for that record ...
    Jared RodriguezJared Rodriguez
    May 12, 2015 at 9:51 am
    May 19, 2015 at 11:48 am
  • Just curious to know on how you are preparing Prod C* clusters for leap sec. What are the workaorund other than upgrading kernel to 3.4+? Are you upgrading clusters to Java 7 or higher on client and ...
    Cass savyCass savy
    May 15, 2015 at 5:26 pm
    May 18, 2015 at 11:43 am
  • Hi, Does Apache Cassandra (not DSE) support Hive Integration? I found couple of open source efforts but nothing is available currently. Thanks Ajay
    May 6, 2015 at 5:58 am
    May 7, 2015 at 5:43 pm
  • Hi, I am using Cassandra 2.0.3 and we use STCS for all CFs. We have recently faced an issue where sstable count of certain CFs went into THOUSANDS. We realized that every week, when "repair -pr" ran ...
    Anuj WadehraAnuj Wadehra
    May 31, 2015 at 6:37 pm
    Jun 6, 2015 at 8:42 pm
  • Hi, I've been investigating using replace_address to replace a node that hasn't left the cluster cleanly and after upgrading from 2.1.0 to 2.1.4 it seems that adding a new node will automatically ...
    Thomas WhitewayThomas Whiteway
    May 27, 2015 at 12:48 pm
    May 29, 2015 at 8:31 am
  • Hi gurus, We have ordered some hardware for a 3-node cluster, but its ETA is 6 to 8 weeks. In the meantime, I have been lent a single server that I can use. I am wondering what the best way is to set ...
    Matthew JohnsonMatthew Johnson
    May 26, 2015 at 1:25 pm
    May 29, 2015 at 3:10 am
  • Hi everyone, We are currently migrating from DSE to Apache Cassandra and we would like to put in place an automatic and periodic *nodetool repair* execution to replace the one executed by OpsCenter ...
    Brice ArgensonBrice Argenson
    May 22, 2015 at 7:01 pm
    May 27, 2015 at 3:10 pm
  • Hi, I am running cassandra version 1.2.19 and cqlsh version 3.1.8 in my setup cqlsh:apprepo select * from test_proxy_revisions_r21 limit 10 ; Traceback (most recent call last): File "./cqlsh", line ...
    Kaushal ShriyanKaushal Shriyan
    May 19, 2015 at 7:44 am
    May 26, 2015 at 8:23 pm
  • Is there a config setting where automatic snapshots can be disabled? I have a use case where a table is truncated quite often, and would like to not have snapshots. I can't find anything on google ...
    Ali AkhtarAli Akhtar
    May 21, 2015 at 7:31 am
    May 26, 2015 at 8:19 pm
  • Hi, I am writing an application that will periodically read big amounts of data from Cassandra and I am experiencing odd performances. My column family is a classic time series one, with series ID ...
    May 7, 2015 at 8:47 am
    May 11, 2015 at 11:53 am
  • I was not able to find a conclusive answer to this question on the internet so I am asking this question here. Is a Cassandra node able to accept insert or delete operations while the node is being ...
    Khaja, Raziuddin (NIH/NLM/NCBI) [C]Khaja, Raziuddin (NIH/NLM/NCBI) [C]
    May 7, 2015 at 4:53 pm
    May 7, 2015 at 6:07 pm
  • Hello,I have downloaded cassandra-1.2.0 for a test. The output of ./bin/cassandra and ./bin/cassandra-cli seems to be fine. Please see http://pastebin.com/Tgs7qyjS Next, I created a setup-ycsb.cql ...
    Mahmood NaderanMahmood Naderan
    May 26, 2015 at 9:38 am
    May 26, 2015 at 2:44 pm
  • I have a single node c* server (used for dev). I've been playing around with it, inserting / removing several million rows. At the moment, all tables have been dropped / truncated, and the data ...
    Ali AkhtarAli Akhtar
    May 22, 2015 at 10:53 am
    May 22, 2015 at 2:30 pm
  • I've seen some discussions about the topic on the list recently, but I would like to get more clear answers. Given the table: CREATE TABLE t1 ( f1 text, f2 text, f3 text, PRIMARY KEY(f1, f2) ); and ...
    Artur SiekielskiArtur Siekielski
    May 15, 2015 at 9:16 am
    May 22, 2015 at 1:31 pm
  • Just wondering if anyone else is seeing this issue on the nodetool after installing 2.1.5 This works nodetool -h cfstats keyspace.table This works nodetool -h localhost cfstats ...
    Walsh, StephenWalsh, Stephen
    May 21, 2015 at 4:05 pm
    May 22, 2015 at 11:51 am
  • Hi We would like to have the ability of being able to create new tables from existing tables (on the fly), but with with a new/different partition key. Can this be done from CQL? Thanks Amit
    Amit tewariAmit tewari
    May 20, 2015 at 5:29 am
    May 20, 2015 at 12:06 pm
  • Hi, I am trying to port an Oracle Table to Cassandra. the table is a wide table (931 columns) and could have millions of rows. name, filter1, filter2....filter30, data1, data2...data900 The user ...
    Alaa Zubaidi (PDF)Alaa Zubaidi (PDF)
    May 11, 2015 at 6:32 pm
    May 14, 2015 at 10:28 pm
  • Hello guys, I have a cluster 2.1.0-2 comprised of 3 nodes. The replication factor=2. We successfully added the third node last week. After that, We ran clean ups on one node at that time. Then we ran ...
    Analia LorenzattoAnalia Lorenzatto
    May 12, 2015 at 2:40 pm
    May 12, 2015 at 7:11 pm
  • Hi Are there any plans to support Java 8 for Cassandra 2.0, now that Java 7 is EOL? Currently Java 7 is also recommended for 2.1. Are there any reasons not to recommend Java 8 for 2.1? Thanks, Stefan
    Stefan PodkowinskiStefan Podkowinski
    May 7, 2015 at 11:33 am
    May 7, 2015 at 8:52 pm
  • I have a 25 noedes C* cluster with C* 2.1.3. These days a node occur split brain many times。 check the log I found this: INFO [MemtableFlushWriter:118] 2015-05-29 08:07:39,176 Memtable.java:378 - ...
    May 29, 2015 at 1:41 am
    May 30, 2015 at 2:25 am
  • Hello. I'm reading "Beginning Apache Cassandra Development" and there are a few things I can't figure out. First. Lets say I have a table (field1, field2, field3, field4), where (field1, field2) is a ...
    Eax MelanhovichEax Melanhovich
    May 26, 2015 at 7:05 pm
    May 27, 2015 at 4:59 am
  • Apart from datastax java client driver, does Apache Cassandra provide its own java client driver? Or should be using the datastax one? If yes, then could anyone give me the link? DISCLAIMER ...
    Rohit NaikRohit Naik
    May 15, 2015 at 9:35 am
    May 26, 2015 at 10:49 pm
  • I have a dev cluster of two Cassandra 2.12 servers on EC2 When adding a new server, I get a "Streaming error occurred java.lang.AssertionError: Unknown keyspace system_traces" exception on the ...
    Tzach LivyatanTzach Livyatan
    May 18, 2015 at 12:35 pm
    May 26, 2015 at 8:13 pm
  • Hi, We operate several Cassandra clusters in various geographies. We are in the process of extending this cluster into an "unfriendly" geography where we may be forced not to trust anything. I ...
    Andreas BaumhofAndreas Baumhof
    May 25, 2015 at 7:34 am
    May 25, 2015 at 2:50 pm
  • Hello! So i was trying to install Cassandra via the Debian repository at http://www.apache.org/dist/cassandra/debian and for some reason the 20x series doesn't have the amd64 binaries. They have ...
    Andrej PreglAndrej Pregl
    May 20, 2015 at 8:20 am
    May 21, 2015 at 6:23 am
  • Has anybody run DSE 3.2.6(C*1.2.16) on JRE 1.7. I know its recommended that we have to get to JVM version 7 to get to C*2.0 and higher. We are experiencing latency issues during rolling upgrade from ...
    Cass savyCass savy
    May 15, 2015 at 5:22 pm
    May 16, 2015 at 7:42 pm
  • I have questions regarding function and limitations of configurability of the property storage_port. Function: What protocols and functions is storage_port used for? Am I right to believe that it is ...
    Magnus VojbackeMagnus Vojbacke
    May 15, 2015 at 9:18 am
    May 15, 2015 at 4:15 pm
  • Hi, tl;dr : How to choose between having a Cluster with 2 DC and having 2 separate clusters as follow: "cluster_name: mycluster KS1 {DC1: 3, DC2: 0} and KS2 {DC1: 0, DC2: 3}" OR "cluster_name ...
    May 5, 2015 at 9:20 am
    May 12, 2015 at 3:54 pm
  • Hi, I m streaming a big sstable using bulk loader of sstableloader but it's very slow (3 Mbytes/sec) : Summary statistics: Connections per host: : 1 Total files transferred: : 1 Total bytes ...
    Pierre DevopsPierre Devops
    May 7, 2015 at 8:46 am
    May 7, 2015 at 7:12 pm
  • Hello, I am unable to connect to the nodes of our second datacenter, not even from localhost. The error message I receive is: Connection error: ('Unable to connect to any servers', {'...' ...
    Björn HachmannBjörn Hachmann
    May 5, 2015 at 3:22 pm
    May 6, 2015 at 12:11 pm
  • Hi All, We have a cassandra cluster of 3 machines, which has a table containing 50 millions of rows. We are making a new cluster of 5 nodes and we want to migrate this table to the new cluster ...
    Rahul BhardwajRahul Bhardwaj
    May 5, 2015 at 8:22 am
    May 6, 2015 at 2:34 am
  • I was wondering something about Cassandra’s internals. Suppose I have CL 1 and I read a partition with a bunch of tombstones. Those tombstones have to be sent to the coordinator for consistency ...
    Robert WilleRobert Wille
    May 29, 2015 at 6:31 pm
    May 29, 2015 at 6:56 pm
  • Evening list, Simple and quick question, can anyone point me to where the Cassandra 1.2.x series EOL date was announced? I see archived mailing list threads for 1.2.19 mentioning it was going to be ...
    Jason UnovitchJason Unovitch
    May 28, 2015 at 12:10 am
    May 28, 2015 at 6:18 pm
  • Hi I'm running Cassandra 2.1.5 ,(single datacenter ,4 node,16GB vps each node ),I have given my configuration below, I'm using python driver on my clients ,when i tried to insert 1049067 items I got ...
    Sachin PKSachin PK
    May 28, 2015 at 1:16 pm
    May 28, 2015 at 2:15 pm
  • Hello,I'm playing with DataStax's ODBC connector for Cassandra and have noticed something...well...broken. If I have a keyspace with tables that don't have a UDT column (even though the UDT is ...
    Ashic MahtabAshic Mahtab
    May 15, 2015 at 3:39 pm
    May 26, 2015 at 10:48 pm
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106 users for May 2015

Ali Akhtar: 18 posts Robert Coli: 16 posts Jonathan Haddad: 10 posts Jason Wee: 8 posts Ken Hancock: 8 posts Nate McCall: 8 posts Walsh, Stephen: 8 posts Analia Lorenzatto: 7 posts Anishek Agarwal: 7 posts Peer, Oded: 7 posts Rahul Bhardwaj: 7 posts Jack Krupansky: 6 posts Robert Wille: 6 posts Sebastian Estevez: 6 posts Sean_r_durity: 5 posts Alprema: 5 posts Jens Rantil: 5 posts Kaushal Shriyan: 5 posts Mark Reddy: 5 posts Stefano Ortolani: 5 posts
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