I’m confused about read vs write performance. I was expecting to see higher
write than read perf. I’m seeing the opposite by nearly 2X
Please help. Am I doing/configuring something wrong or do I have the wrong
expectations. I am very new to Cassandra. And this is not using Datastax. .
I
30G java heap. The dataset is the usual Cassandra-test size
How do I tell if compaction has completed?
I will add more iterations/time to the test.
Thank you
Date: Friday, July 14, 2017 at 2:21 PM
To: Roger Warner
Subject: Re: Reversed read write performance.
Pls add info about caching
Hi
I’m a little dim on what multi datacenter implies in the 1 replica case. I
know about replica recovery, how about “node recovery”
As I understand if there a node failure or disk crash with a single node
cluster with replication factor 1 I lose data.Easy.
nodetool tells me each node
This is a quick informational question. I know that Cassandra can detect
failures of nodes and repair them given replication and multiple DC.
My question is can Cassandra tell if data was lost after a failure and node(s)
“fixed” and resumed operation?
If so where would it log or flag it? O
You need to also have the mx4j jar in your Cassandra lib directory. Double
checking you did that – its not included with the distro.You have to
download it.
http://mx4j.sourceforge.net/
R
From: Nitan Kainth
Reply-To: "user@cassandra.apache.org"
Date: Wednesday, July 26, 2017 at 8:22 AM
:
java -jar /var/lib/cassandra/mx4j-3.0.1.jar url localhost:7199
no main manifest attribute, in /var/lib/cassandra/mx4j-3.0.1.jar
On Jul 26, 2017, at 11:50 AM, Roger Warner
mailto:rwar...@pandora.com>> wrote:
You need to also have the mx4j jar in your Cassandra lib directory.
What would running a repair on a cluster do when there are no deletes nor have
there ever been?I have no deletes yet on my data.Yet running a repair
took over 9 hours on a 5 node cluster?
Roger?
