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. .
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 <rwar...@pandora.com>
Subject: Re: Reversed read write performance
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?
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"
otFoundException: org.apache.cassandra.metrics:type=ClientRequest
I tried using mx4 jar file:
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
<rwar...@pandora.com
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
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?