Re: OOM on Apache Cassandra on 30 Plus node at the same time

In fact I truncated hints table to stabilize the cluster. Through the heap dumps I was able to identify the table on which there were numerous queries. Then I focused on system_traces.session table around the time OOM occurred. It turned out to be a full table scan on a large table which caused

Re: Any way to control/limit off-heap memory?

On 2017-03-06 07:04 (-0800), "Thakrar, Jayesh" wrote: > Thanks Hannu - also considered that option. > However, that's a trial and error and will have to play with the > collision/false-positive fraction. > And each iteration will most likely result in a compaction storm - so I was > hoping f

Re: OOM on Apache Cassandra on 30 Plus node at the same time

On 2017-03-03 09:18 (-0800), Shravan Ch wrote: > > nodetool compactionstats -H > pending tasks: 3 > compaction typekeyspace table > completed totalunit progress > Compaction system hints > 28.

Re: OOM on Apache Cassandra on 30 Plus node at the same time

On 2017-03-04 07:23 (-0800), "Thakrar, Jayesh" wrote: > LCS does not rule out frequent updates - it just says that there will be more > frequent compaction, which can potentially increase compaction activity > (which again can be throttled as needed). > But STCS will guarantee OOM when you h

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Re: Splitting Cassandra Cluster between AWS availability zones

Hi, Before: 1 cluster with 2 DC. 3 nodes in each DCNow: 1 cluster with 1 DC. 6 nodes in this DC Is it right? If yes, depending on the RF - and assuming NetworkTopologyStrategy - I would do: - RF = 2  => 2 C* rack, one rack in each AZ - RF = 3  => 3 C* rack, one rack in each AZ In other words, I

Re: Splitting Cassandra Cluster between AWS availability zones

Hi Richard, It depends on the snitch and the replication strategy in use. Here's a link to a blogpost about how we deployed C* on 3AZ http://highscalability.com/blog/2016/8/1/how-to-setup-a-highly-available-multi-az-cassandra-cluster-o.html Best, Tommaso On Mar 7, 2017 18:05, "Ney, Richard"

Re: Frozen type sin cassandra.

On Sun, Mar 5, 2017 at 11:53 PM, anuja jain wrote: > Is there is difference between creating column of type > frozen> and frozen where list_double is UDT of > type frozen> ? > Yes, there is a difference in serialization format: the first will be serialized directly as a list, the second will be

Re: Splitting Cassandra Cluster between AWS availability zones

I'd recommend three availability zones. In this case if you loose one AZ you still have a quorum (assuming replication factor of 3) Andrey On Tue, Mar 7, 2017 at 9:05 AM, Ney, Richard wrote: > We’ve collapsed our 2 DC – 3 node Cassandra clusters into a single 6 node > Cassandra cluster split be

Splitting Cassandra Cluster between AWS availability zones

We’ve collapsed our 2 DC – 3 node Cassandra clusters into a single 6 node Cassandra cluster split between two AWS availability zones. Are there any behaviors we need to take into account to ensure the Cassandra cluster stability with this configuration? RICHARD NEY TECHNICAL DIRECTOR, RESEARCH

Re: Changed node ID?

Hi, Why did the host ID change? probably this node data folder (at least system keyspace) was erased. Or nodes changed their IP, do you use dynamic IPs? Best regards, Vladimir Yudovin, Winguzone - Cloud Cassandra Hosting On Mon, 06 Mar 2017 22:44:50 -0500 Joe Olson

Re: Does Java driver v3.1.x degrade cluster connect/close performance?

Hi Satoshi, One correction on my previous email, at 2.1.8 of the driver, Netty 4.0 was >> in use, so please disregard my comments about the netty dependency changing >> from 3.9 to 4.0, there is a different in version, but it's only at the >> patch level (4.0.27 to 4.0.37) >> > Does your comment m