Does Cassandra supports ACID txn

Hi, I am bit confused by reading different articles, does recent version of Cassandra supports ACID transaction ? I found BATCH command , but not sure if it supports rollback, consider that transaction I am going to perform would be on single partition. Also, what are the limitations if any?

Re: A Cassandra Storage Estimation Mechanism

Hi Onmestester, A few comments inline: > > 1. I'm using the real schema + > 3 nodes cluster > Since you are only interested in data usage, for simplicity, you could use a single node cluster (your computer), and use RF=1. If your production cluster will use RF=3, you will just need to multiply.

Re: Dropped Mutations

Hi , I'll recommend tuning you heap size further( preferably lower) as large Heap size can lead to Large Garbage collection pauses also known as also known as a stop-the-world event. A pause occurs when a region of memory is full and the JVM needs to make space to continue. During a pause all

Re: Token range redistribution

On 2018-04-18 21:28, kurt greaves wrote: replacing. Simply removing and adding back a new node without replace address will end up with the new node having different tokens, which would mean data loss in the use case you described. If you have replication factor N > 1, you haven't necessarily

Re: Logback-tools.xml

On 04/18/2018 10:39 AM, Abdul Patel wrote: > > I have instakled 3.11.2 and i see 2 new files ..logback-tools.xml and > -jaas.config .. > > What are they used for ? logback-tools.xml is the logback configuration for all the tools under bin/ and tools/bin/, so you could change the root log level

Dropped Mutations

Hi All, I have a 44 node cluster (22 nodes on each DC). Each node has 24 cores and 130 GB RAM, 3 TB HDDs. Version 2.0.14 (soon to be upgraded) ~10K writes per second per node. Heap size: 8 GB max, 2.4 GB newgen I deployed Reaper and GC started to increase rapidly. I'm not sure if it's because

Logback-tools.xml

Hey All, I have instakled 3.11.2 and i see 2 new files ..logback-tools.xml and -jaas.config .. What are they used for ?

Re: where does c* store the schema?

Blake, you are right — although it’s he system keyspace not the system table. There are a few tables : schema_keyspaces, schema_columnfamilies, schema_columns which are correlated via cf_id , keyspace , columnfamilyname, and Columnname I was thinking about the system_auth keyspace. Jinhua,

Re: Token range redistribution

A new node always generates more tokens. A replaced node using replace_address[_on_first_boot] will reclaim the tokens of the node it's replacing. Simply removing and adding back a new node without replace address will end up with the new node having different tokens, which would mean data loss in

Token range redistribution

Hi, If i replace a node does it redistributes the token range or when the node again joins will it be allocated a new token range. Use case: I have booted a C* on AWS. I terminated a node and then boot a new node assigned it the same ip and made it join the cluster. In this case would the token

Re: where does c* store the schema?

What happens If one node has outdated version of schema, and it launches a write request upon that schema to other nodes as a coordinator? The received nodes would reject the coordinator? 2018-04-18 8:12 GMT+08:00 Blake Eggleston : > Rahul, none of that is true at all. >

Re: Is it safe to use paxos protocol in LWT from patent perspective ?

Hi Hiroyuki, That's an interesting question, it looks like Paxos was invented in 1989: https://en.wikipedia.org/wiki/Paxos_(computer_science) So "prior art" could discard such patent claim. -- Jacques-Henri Berthemet From: Hiroyuki Yamada