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Topic for #virtualJUG is now Welcome to the Virtual JUG - http://virtualJUG.com. IRC logs can be found here -> http://irclog.greptilian.com/virtualJUG/today |
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Topic for #virtualJUG is now Welcome to the Virtual JUG - http://virtualJUG.com. IRC logs can be found here -> http://irclog.greptilian.com/virtualJUG/today |
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pdurbin |
hearing good things about javamelody - http://irclog.greptilian.com/friendlyjava/2015-07-15 |
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SNR_Leeds |
I thought this was "So why would I use a distributed database like Apache Cassandra? " |
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Ric |
Me too |
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chbatey |
It is :) |
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chbatey |
I hope… |
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SNR_Leeds |
Well I'd hope you know @chbatey ;) |
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sjmaple |
hey |
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sjmaple |
just about to start... |
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SteveG |
Is this the right place for Cassandra presentation? |
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chbatey |
yep |
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shelajev |
hello everyone |
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osama |
how do i get the vjug session for cassandra |
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osama |
do i need to login somewhere? |
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shelajev |
the video should be right here: http://virtualjug.com/#live |
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SteveG |
No sign of the video... |
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shelajev |
1 second, we're working on getting it fixed |
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KotaiVictor |
Hmm, I'm still seeing the part 3 of the Josh Bloch one. |
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SteveG |
Me too. |
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shelajev |
yep, that's the problem. Sorry, fixing it as we speak |
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ybh6336 |
hello, has the live session begun? |
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osama |
i cant see anything |
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sjmaple |
try a refresh now |
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shelajev |
a refresh should help! |
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shelajev |
sorry :) |
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znurgl |
I'm watching it on youtube: https://www.youtube.com/watch?v=i3yUlwoCPzU |
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osama |
cool i can see it now |
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SteveG |
Yay I can now see the vJug |
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sjmaple |
so sorry about that! |
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sjmaple |
I updated the page in wordpress but didn't click Update!!! |
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HarmeetSingh |
Hello to all @Vjug members |
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MW |
Greetings all |
| 16:11 |
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sjmaple |
hello everyone! If you have any questions, please post them in here for Chris |
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sjmaple |
he'll be taking them at the end |
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HarmeetSingh |
great |
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MW |
thanks |
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shelajev |
if you have any questions, fire them right here |
| 16:16 |
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shelajev |
and Simon or I can pass them to Christopher |
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sjmaple |
good point Oleg. I wish I'd have said that ;) |
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sjmaple |
anyone here using cassandra already? |
| 16:25 |
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HarmeetSingh |
nope |
| 16:25 |
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HarmeetSingh |
@simon you hace experience with cassandra ? |
| 16:26 |
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sjmaple |
no, I've always wanted to play with it as it sounds like all the kool kids use it |
| 16:26 |
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HarmeetSingh |
great |
| 16:26 |
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sjmaple |
another "never had the time" |
| 16:26 |
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HarmeetSingh |
same problem here :P |
| 16:27 |
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jkremser |
We use it in our project |
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shelajev |
any questions so far? |
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sjmaple |
Here's the paper which Christopher is referring to http://www.allthingsdistributed.com/files/amazon-dynamo-sosp2007.pdf |
| 16:39 |
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foo |
Thanks |
| 16:39 |
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sjmaple |
if you wanted to follow Christopher on twitter, he's http://twitter.com/chbatey |
| 16:39 |
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Hussain |
Thanks |
| 16:41 |
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sjmaple |
foo: Mr Slowe? |
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foo |
No, not Mr Slowe |
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sjmaple |
ok :) |
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sjmaple |
I know another foo :D |
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foo |
:-) |
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| 16:51 |
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sjmaple |
what happens if the coordinator or remote coordinator goes down? Also, who determines which node is the coordinator? |
| 16:52 |
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snazy |
there's no "the coordinator". coordinator is just the node that executes the request - any node can be the coordinator for any query |
| 16:53 |
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snazy |
in terms of performance (less network roundtrips) the drivers prefer a replica node to execute a query. |
| 16:53 |
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jkremser |
so consistency lvl denotes how many acks does it needs to respond to the client? |
| 16:53 |
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sjmaple |
ahh ok, how does a coordinator pick which remote coordinator to use? |
| 16:53 |
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snazy |
sjmaple: same algorithm :) |
| 16:53 |
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snazy |
just in other DC |
| 16:53 |
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snazy |
jkremser: yes |
| 16:53 |
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sjmaple |
ok, how does it know of them? |
| 16:54 |
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sjmaple |
some multicast like thing? |
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snazy |
no mc - just tcp connections. there's a (small) set of nodes in the config (= seed nodes) - these are "initial contact points" |
| 16:55 |
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sjmaple |
ahh ok, got it |
| 16:55 |
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snazy |
from these the nodes know about the other nodes (and their token-ranges) |
| 16:55 |
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snazy |
but: seed-nodes != master :) |
| 16:55 |
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sjmaple |
:) |
| 16:55 |
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sjmaple |
sounds like master with failover to me ;) |
| 16:55 |
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sjmaple |
mwahaha |
| 16:57 |
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snazy |
they're just needed on startup - after that, nodes "gossip" about the other nodes |
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sjmaple |
like sharing a live nodes table or similar I guess |
| 16:59 |
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snazy |
gossip data (on the wire) is really small. but in the end it builds a complete view of the whole cluster in every node |
| 17:00 |
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sjmaple |
I guess it has to be, as when the number of nodes scale, it will get super chatty |
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snazy |
not really. it does only exchange some kind of diff |
| 17:02 |
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sjmaple |
Chris is just wrapping up now, any questions? |
| 17:05 |
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MW |
Can you recommend any additional literature on Cassandra? |
| 17:06 |
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snazy |
Try to start at http://www.planetcassandra.org/ - there's also a "try out VM", docs. Looking for something specific? |
| 17:06 |
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sjmaple |
http://www.amazon.co.uk/Cassandra-High-Availability-Robbie-Strickland/dp/1783989122 |
| 17:07 |
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snazy |
http://academy.datastax.com/ |
| 17:07 |
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MW |
Super. thanks :) |
| 17:07 |
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jeqo |
have you use titandb (graph database) that has been adquired by datastax? when use it instead of cassandra? |
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snazy |
titan works on top of C* |
| 17:10 |
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millrossjez |
Book referenced by Chris Batey: http://www.amazon.co.uk/Cassandra-High-Availability-Robbie-Strickland/dp/1783989122 |
| 17:11 |
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jkremser |
thanks |
| 17:11 |
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MW |
Super session! Thanks! |
| 17:11 |
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millrossjez |
(forgot I'm on a 10 minute delay, sorry for duplication :)) |
| 17:11 |
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chbatey |
Robbie is awesome, that book is great |
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millrossjez |
thanks very much Chris, great session |
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