Re: Understanding gossip protocol in cassandra
If i remember correctly; In real life gossip, you can not get the information before you give some. New machine sends it's own state to seed node, seed node replys this message with list of other nodes and their states (end of seed node role), then after a while (if i remember correctly gossip protocol using one seconds interval) new machine chooses a another node from this list by random and sends information it's own, response of this message is a list of other machines and their states and it goes like this. every nodes doing this in X second interval so every machine eventually knows other nodes and their states. In every state, node send this information to randomly choosen node. If i'm wrong other peoples will correct this message. On Mon, Aug 3, 2015 at 5:27 PM, Thouraya TH thouray...@gmail.com wrote: Hi all, Please, i try to undestand how gossip protocol is used in cassandra. I read this: “This is most critical the first time a node starts up. By default, a node remembers other nodes it has gossiped with between subsequent restarts. The seed node designation has no purpose other than bootstrapping the gossip process for new nodes joining the cluster. Seed nodes are not a single point of failure, nor do they have any other special purpose in cluster operations beyond the bootstrapping of nodes. “ I understand that the seed node starst gossip protocol and then, the new nodes join the seed node i.e send their state informations to the seed node Then, the seed node broadcast received informations to all nodes on the ring ? That’s it ? Thank you so much for all explanations. Best Reagrds. -- Saygılar İyi Çalışmalar Timu EREN ( a.k.a selam )
Re: How can I implement 'LIKE operation in SQL' on values while querying a column family in Cassandra
Mapreduce jobs may solve your problem for batch processing On Tue, May 15, 2012 at 12:49 PM, Abhijit Chanda abhijit.chan...@gmail.comwrote: Tamar, Can you please illustrate little bit with some sample code. It highly appreciable. Thanks, On Tue, May 15, 2012 at 10:48 AM, Tamar Fraenkel ta...@tok-media.comwrote: I don't think this is possible, the best you can do is prefix, if your order is alphabetical. For example I have a CF with comparator UTF8Type, and then I can do slice query and bring all columns that start with the prefix, and end with the prefix where you replace the last char with the next one in order (i.e. aaa-aab). Hope that helps. *Tamar Fraenkel * Senior Software Engineer, TOK Media [image: Inline image 1] ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 Fax: +972 2 5612956 On Tue, May 15, 2012 at 7:56 AM, Abhijit Chanda abhijit.chan...@gmail.com wrote: I don't know the exact value on a column, but I want to do a partial matching to know all available values that matches. I want to do similar kind of operation that LIKE operator in SQL do. Any help is highly appreciated. -- Abhijit Chanda Software Developer VeHere Interactive Pvt. Ltd. +91-974395 -- Abhijit Chanda Software Developer VeHere Interactive Pvt. Ltd. +91-974395 -- Saygılar İyi Çalışmalar Timu EREN ( a.k.a selam ) tokLogo.png
Re: cassandra data viewer?
look at chiton on github. On Tue, Apr 6, 2010 at 3:06 AM, AJ Chen cano...@gmail.com wrote: Is there a generic GUI tool for viewing cassandra datastore? being able to view and edit data from a GUI tool like oracle sqldeveloper is very useful. -aj -- Saygılar İyi Çalışmalar Timu EREN ( a.k.a selam )
