Re: Some questions about using Binary Memtable to import data.

Thanks for you information. I look at some source code of the implement. There still some question: 1 How did I know that the binary write message send to endpoint success? 2 What will happen if the some of nature endpoints dead? Thanks again. On Wed, May 19, 2010 at 2:26 PM, Jonathan Ellis wr

Cassandra compaction disk space logic

Hi! We have mail archive application, so we have a lot of data (30TB on multiple nodes) and should delete data after a few months of storing. Questions are: 1) Compaction require extra space to process. What happend if node have no extra space for compaction ? Will it crash, or just stop com

Strange error with data reading

Hello! I have 3 node cluster: node1, node2, node3. Replication factor = 2. I run decommission on node3 and it's in progress, moving data to node1 Ring on all nodes show all 3 nodes up, no problems (but node 1 response with 3-5 sec delay). I tried to execute a few "get" statements using cli, l

Re: Data migration from mysql to cassandra

Thanks Jonathan, using mysql as an id sequence generator definitely is a good options. One thing though, does using sequential ids defeat the purpose of random partitioner? On Tue, May 18, 2010 at 11:25 PM, Jonathan Ellis wrote: > Those are 2 of the 3 options (the other one being, continue to >

key path vs super column

We are currently working on a prototype that is using Cassandra for realtime-ish statistics system. This seems to be quite a common use case. If people are interested - maybe it be worth collaborating on this beyond design discussions on the list. But first let's me explain our approach and where w

Re: Cassandra compaction disk space logic

2010/5/19 Maxim Kramarenko : > Hi! > > We have mail archive application, so we have a lot of data (30TB on multiple > nodes) and should delete data after a few months of storing. > > Questions are: > > 1) Compaction require extra space to process. What happend if node have no > extra space for comp

Ring out of sync, cassandra_UnavailableException being thrown

in a 5 node cluster, i noticed in our client error log that one of the nodes was consistently throwing cassandra_UnavailableException during a read operation. looking into jmx, it was obvious that one of the node's view of the ring was out of sync. $ nodetool -host 192.168.20.150 ring Address

Re: Disk usage doubled after nodetool decommission and node still in ring

Run nodetool streams. On May 18, 2010 4:14 PM, "Maxim Kramarenko" wrote: Hi! After nodetool decomission data size on all nodes grow twice, node still up and in ring, and no streaming now / tmp SSTables now. BTW, I have ssh connection to server, so after run nodetool decommission I expect, that

Re: ConcurrentModificationException in gossiper while decommissioning another node

that sounds like it, thanks On Tue, May 18, 2010 at 3:53 PM, roger schildmeijer wrote: > This is hopefully fixed in trunk (CASSANDRA-757 (revision 938597)); > "Replace synchronization in Gossiper with concurrent data structures and > volatile fields." > > // Roger Schildmeijer > > > On Tue, May 1

Re: decommission and org.apache.thrift.TApplicationException: get_slice failed: unknown result

My decommission was progressing OK, although very slow, but I'll send another question to the list about that... The exception must be a hiccup, I hope I won't get it again I suppose... On Tue, May 18, 2010 at 4:10 PM, Gary Dusbabek wrote: > If I had to guess, I'd say that something at the trans

how to decommission two slow nodes?

In my cluster setup I have two datacenters with 5 hosts in one DC and 3 in the other. In the 5 hosts DC I'd like to remove two hosts so I'd get 3 and 3 in each. The two nodes I'd like to decommission have less RAM than the other 3 so they operate slower. What's the most effective way to decommissio