Why is yum pulling in open JDK ?

Hi, When I install cassandra on CentOS via yum, I see it also installs openjdk. Why is that? Given that it is adviced in the documentation to use Oracle JRE? See http://www.datastax.com/documentation/cassandra/2.0/cassandra/install/installRHEL_t.html ? Also, what is the difference between using

DROP Table put Cassandra in an inconsistent state

Hi, I just encountered a bug with 2.1-rc1 (didn't have the chance to update to rc2 yet), and wondering if it's known or if I should report the issue on JIRA. Basically I dropped a cf/table and it failed, then put Cassandra in a state where neither the table nor the hybrid can be dropped (at

Re: keyspace with hundreds of columnfamilies

Just so you guys aren't misunderstanding each other; Tommaso, you were not refering to CQL-style columns, right? /J On Fri, Jul 4, 2014 at 10:18 AM, Romain HARDOUIN romain.hardo...@urssaf.fr wrote: Cassandra can handle many more columns (e.g. time series). So 100 columns is OK. Best,

RangeTombstone AIOOBE

Hi, We are running Cassandra 1.2.16 to store data using CQl with the following structure. CREATE TABLE sample1 ( row_id text, timeuid timeuuid, value blob, PRIMARY KEY (row_id, timeuid)) CREATE TABLE sample2 ( row_id text, timeuid timeuuid, value blob, PRIMARY KEY (row_id, timeuid)) The server

Is timestamp a reserved word in CQL?

Hi all, I find in the doc, http://www.datastax.com/documentation/cql/3.1/cql/cql_reference/keywords_r.html , keyword timestamp is not reserved. However, when I create a table with a column named timestamp, it is changed to timestamp which is in double quotation marks automatically. Is timestamp

Re: Is timestamp a reserved word in CQL?

It's not reserved but can have a specific meaning in some context. On Fri, Jul 4, 2014 at 1:29 PM, Philo Yang ud1...@gmail.com wrote: Hi all, I find in the doc, http://www.datastax.com/documentation/cql/3.1/cql/cql_reference/keywords_r.html , keyword timestamp is not reserved. However,

Disable vnode

hello Team, I am looking for standard operating procedure to disable vnode in a production cluster. This is to enable solr which doesn't work with a cassandra cluster having vnode enabled. Any suggestions/ Thanks, Rameez

Re: Disable vnode

Hi Rameez, I have never done a migration from vnodes to non-vnodes however I would imagine that the procedure would be the same as its counterpart. As always testing in dev should be done first. To move from vnodes to non-vodes I would add a new datacenter to the cluster with vnodes disabled and

Re: Disable vnode

Thanks Mark. the procedure you shared is useful. I think I have missed the nodetool rebuild command. I am trying it out in a non-prod environment. The num_tokens is set to 1 and initial_token is set to different values (mine is a 6 node cluster with 3 in each datacenter). Tried a rolling restart

Re: Disable vnode

i did a nodetool rebuild on one of the nodes. Datacenter: DC1 Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns Host ID Rack *UN 10.123.75.51 10.54 GB 256 16.0%

Cassandra use cases/Strengths/Weakness

Hi, I have seen this in a lot of replies that Cassandra is not designed for this and that. I don't want to sound rude, i just need some info about this so that i can compare it to technologies like hbase, mongo, elasticsearch, solr, etc. 1) what is Cassandra designed for. Heave writes yes. So is

Re: Write Inconsistency to update a row

I've installed ntpd. Thanks! 2014-07-03 23:14 GMT-03:00 Jonathan Haddad j...@jonhaddad.com: Make sure you've got ntpd running, otherwise this will be an ongoing nightmare. On Thu, Jul 3, 2014 at 5:00 PM, Sávio S. Teles de Oliveira savio.te...@cuia.com.br wrote: I have synchronized the

Re: Cassandra use cases/Strengths/Weakness

These are my personal opinions based on few months using Cassandra. These are my views. Others may have different opinion http://khangaonkar.blogspot.com/2014/06/apache-cassandra-things-to-consider.html regards On Fri, Jul 4, 2014 at 7:37 AM, Prem Yadav ipremya...@gmail.com wrote: Hi, I

Re: Cassandra use cases/Strengths/Weakness

I’ve supported a variety of different “big data” systems and most have their own particular set of use cases that make sense. Having said that, I believe that Cassandra uniquely excels at the following: * Low write latency with respect to small to medium write sizes (logs, sensor data, etc.) *

Re: How to perform Range Queries in Cassandra

Hi Mike, To learn get subsecond performance on your queries using _any_ database you need to use proper indexing. Like Jeremy said, Solr will do this. If you'd like to try to solve this using Cassandra you need to learn the difference between partition and clustering in your primary key

Re: Cassandra use cases/Strengths/Weakness

I would answer your question this way: 1) Why should I choose C* ? a. linear scalability, throughputs scale almost linearly with number of nodes b. almost unbounded extensivity (there is no limit, or at least huge limit in term of number of nodes you can have on a cluster) c. operational

Re: Cassandra use cases/Strengths/Weakness

Duy, if you are not already working for Datastax, they should hire you. :) Great response. You have given me some good points to think about. I will do the rest of the research. Thanks. On Fri, Jul 4, 2014 at 10:10 PM, DuyHai Doan doanduy...@gmail.com wrote: I would answer your question

Re: Cassandra use cases/Strengths/Weakness

Elasticsearch and Solr are “search platforms”, not “databases”. The best description for Cassandra, especially for a CTO, is its home page: http://cassandra.apache.org/ Even if you have seen it before, please read it again. There is a lot packed into a few words. DataStax Enterprise (DSE)