Re: Efficiency of Cross Data Center Replication...?

2011-11-21 Thread Boris Yen
If I want RR to work, does this mean the consistency level has to be each_quorum or all? On Mon, Nov 21, 2011 at 2:29 AM, Jeremiah Jordan jeremiah.jor...@morningstar.com wrote: If hinting is off. Read Repair and Manual Repair are the only ways data will get there (just like when a single node

Re: Efficiency of Cross Data Center Replication...?

2011-11-20 Thread Boris Yen
A quick question, what if DC2 is down, and after a while it comes back on. how does the data get sync to DC2 in this case? (assume hint is disable) Thanks in advance. On Thu, Nov 17, 2011 at 10:46 AM, Jeremiah Jordan jeremiah.jor...@morningstar.com wrote: Pretty sure data is sent to the

Re: Efficiency of Cross Data Center Replication...?

2011-11-20 Thread Mohit Anchlia
On Sun, Nov 20, 2011 at 4:01 AM, Boris Yen yulin...@gmail.com wrote: A quick question, what if DC2 is down, and after a while it comes back on. how does the data get sync to DC2 in this case? (assume hint is disable) Thanks in advance. Manually, use nodetool repair in rolling fashion on all

Re: Efficiency of Cross Data Center Replication...?

2011-11-20 Thread Jeremiah Jordan
If hinting is off. Read Repair and Manual Repair are the only ways data will get there (just like when a single node is down). On Nov 20, 2011, at 6:01 AM, Boris Yen wrote: A quick question, what if DC2 is down, and after a while it comes back on. how does the data get sync to DC2 in this

Efficiency of Cross Data Center Replication...?

2011-11-16 Thread Brian Fleming
Hi All, I have a question about inter-data centre replication : if you have 2 Data Centers, each with a local RF of 2 (i.e. total RF of 4) and write to a node in DC1, how efficient is the replication to DC2 - i.e. is that data : - replicated over to a single node in DC2 once and internally

Re: Efficiency of Cross Data Center Replication...?

2011-11-16 Thread Sylvain Lebresne
To be complete, https://issues.apache.org/jira/browse/CASSANDRA-3472 is relevant. -- Sylvain On Wed, Nov 16, 2011 at 9:40 PM, Jake Luciani jak...@gmail.com wrote: the former On Wed, Nov 16, 2011 at 3:33 PM, Brian Fleming bigbrianflem...@gmail.com wrote: Hi All, I have a question about

Re: Efficiency of Cross Data Center Replication...?

2011-11-16 Thread Brian Fleming
Great - thanks Jake B. On Wed, Nov 16, 2011 at 8:40 PM, Jake Luciani jak...@gmail.com wrote: the former On Wed, Nov 16, 2011 at 3:33 PM, Brian Fleming bigbrianflem...@gmail.comwrote: Hi All, I have a question about inter-data centre replication : if you have 2 Data Centers, each

Re: Efficiency of Cross Data Center Replication...?

2011-11-16 Thread ehers...@gmail.com
On a related note - assuming there are available resources across the board (cpu and memory on every node, low network latency, non-saturated nics/circuits/disks), what's a reasonable expectation for timing on replication? Sub-second? Less than five seconds? Ernie On Wed, Nov 16, 2011 at 4:00

Re: Efficiency of Cross Data Center Replication...?

2011-11-16 Thread Jeremiah Jordan
Pretty sure data is sent to the coordinating node in DC2 at the same time it is sent to replicas in DC1, so I would think 10's of milliseconds after the transport time to DC2. On Nov 16, 2011, at 3:48 PM, ehers...@gmail.com wrote: On a related note - assuming there are available resources