#magnetodb

Dmitriy Ukhlov proposed a change to stackforge/magnetodb: Parallelize BatchWrite operation https://review.openstack.org/86644

hello, everyone

Dmitriy Ukhlov proposed a change to stackforge/magnetodb: Parallelize BatchWrite operation https://review.openstack.org/86644

Guys, I've started to implement magnetodb client. Here is a link to repo https://github.com/aostapenko/python-magnetodbc...

hi guys

jeromatron: hi! how are you?

miarmak: doing pretty well, how are you?

jeromatron: : quite well too, thanks)

jeromatron: I have 1 question about consistency levels in Cassandra...

sure

jeromatron: There is level ALL on write and read operation. What behaviour of this level will be with Multi Data Centers?

ALL is regardless of datacenter. it's also going to fail if any replica is down. what are you trying to do?

jeromatron: I just trying to figure out how it works and don't actually understand it exactly... Ok, and if I have several DC's and want to make ALL level only in local datacenter?

jeromatron: smth like LOCAL_QOURUM, but I'm interested in local ALL

there isn't a consistency level for ALL in the local datacenter. there's LOCAL_QUORUM and LOCAL_ONE though. ALL isn't used very much because it's not at all fault tolerant. keep in mind that writes are going to go to all replicas regardless of consistency level. it just returns success to the client after the consistency level has been met.

jeromatron: Ok, clear. Thank you for help!

you might check out this presentation for a study that they did - http://planetcassandra.org/blog/post/a-netflix-...

netflix did some testing with consistency levels. the video is pretty good - it's from the cassandra summit last year

jeromatron: ok, I'll watch it. Thanks

np - hopefully it's helpful

jeromatron: Yed, it is :)

yes*

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Dmitriy Ukhlov proposed a change to stackforge/magnetodb: Parallelize BatchWrite operation https://review.openstack.org/86644

bye folks! Have a nice weekend!:)

Dmitriy Ukhlov proposed a change to stackforge/magnetodb: Storage refactoring for async table creation pluggability https://review.openstack.org/90494