Consistency Question

Hello, I have a question about Cassandra's consistency in the case of failure conditions. Am I correct in assuming that in the event of a node failure with write consistency ALL (assuming the failure happened after the coordinator started the write), a subsequent read with ONE could return st

Re: Gossip Analysis

number of cycles required to answer you is, yet, not scientifically determined in our implementation, but I feel it's sufficient in most deployments right now, and the knob we have to turn if not is -Dcassandra.ring_delay_ms. On Tue, Sep 30, 2014 at 10:50 AM, William Katsak wrote: Hello,

Gossip Analysis

Hello, Forgive me if I have missed anything in the obvious locations, but I am trying to find out if anyone has done an analysis of the gossip protocol as implemented in Cassandra? In particular, I am interested in the the theoretical propagation time (to all nodes) of a change. For example, if

Re: Streaming RowMutations (and possibly merging them)

a new facility? Again, my codebase is on top of Cassandra 1.1.6. I would very much appreciate any insight anyone could give me. Thanks very much, Bill Katsak On 04/08/2013 12:10 PM, William Katsak wrote: Hello, I am sorry to bother the list with this question, but I was wondering, assuming I have

Streaming RowMutations

Hello, I am sorry to bother the list with this question, but I was wondering, assuming I have many saved (small) mutations (of the type that hinted handoff uses), is there any easy way to put these all together and bulk transmit (stream) them to a destination node? My codebase is based on Ca

Question about slicing

Hello, I am working on some experimental modifications to Cassandra and I was wondering if someone can help me with an easy answer to this: Say I have a column family in the system keyspace where I am keeping some bookkeeping data (couple hundred thousand columns) at times. I don't want to

Question about Streaming

Hello, I am working on some modifications of Cassandra in an academic setting (research code, not for a class), and have a question regarding bulk streaming of data across the network (e.g. between nodes). Assume that I have some known set of key/column family combos that are known good/curr

Anti-Entropy Question

Hello, I have a question that may seem strange. Assume that I have some *known* set of rows in a (potentially very) large data set that I know are out of consistency across the replicas. I can obviously bring these back into consistency by issuing standard reads (with read repair probability se

Re: Write Timestamps

CQL layer on the server adds the timestamp. I am less familiar with the CQL code, maybe something screwy is going on there. 1.1.6 is out, do you see the same behavior there? -Jeremiah On Oct 24, 2012, at 3:57 PM, William Katsak wrote: Here is what I am seeing on each replica node. This is

Re: Write Timestamps

ntained in the RowMutation. On Wed, Oct 24, 2012 at 2:57 PM, William Katsak wrote: Hello, I sent this message a few days ago, but it seems to have gotten lost (I don't see it on the archive), so I am trying again. - I am using Cassandra for some academic-type work that involves som

Write Timestamps

Hello, I sent this message a few days ago, but it seems to have gotten lost (I don't see it on the archive), so I am trying again. - I am using Cassandra for some academic-type work that involves some hacking of replica placement, etc. and I am observing a strange behavior (well, strang