Reversed read write performance.

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. .

Re: Reversed read write performance.

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

Data Loss irreparabley so

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?

Re: read/write request counts and write size of each write

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"

Re: read/write request counts and write size of each write

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

Multi datacenter node loss

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

Nodetool repair on read only cluster

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?