Size of a single Data Row?

Hi, I have a general question concerning the Cassandra technology. I already read 2 books but after all I am more and more confused about the question if Cassandra is the right technology. My goal is to store Business Data form a workflow engine into Cassandra. I want to use Cassandra as a kin

Re: Size of a single Data Row?

Hi Ralph, Yes, having partitions of 100mb will seriously hit your performance. But usually the issue here is for people handling large numbers of transactions and aiming for low latency. My understanding is the column value up to 2GB is it’s max. Like after that the system would start to fail,

Re: Size of a single Data Row?

Hi Eevee, thanks for your response. Low latency is not an issue because I do read only in rarely cases and also I write rarely cases. But for me it is important to have a high data consistency over a decentralized cluster. And Cassandra fills that perfectly. Hadoop is much more complex in setu

Re: Size of a single Data Row?

I'd like to split your question into two parts. Part one is around recovery. If you lose a copy of the underlying data because a note fails and let's assume you have three copies, how long can you tolerate the time to restore the third copy? The second question is about the absolute length of a r

Re: Size of a single Data Row?

Thanks for your answer. Ok - I think I understand your points and the worries you have about my architecture. To give more inside information: We are working on the Open Source Project Imixs-Workflow . This is a human-centric workflow engine based on Java EE. The engine run

Re: Size of a single Data Row?

Let's talk about what the real limitations are. There are two here that you should care about: 1) Cassandra runs in the JVM. When you read and write to Cassandra, those objects end up in the heap as byte arrays. If you're regularly reading and writing 100MB byte arrays, it's easy to see situations

答复: sstabledump and liveness_info question

Hi Anyone can help on this would be highly appreciated. Best Regards, 倪项菲/ David Ni 中移德电网络科技有限公司 Virtue Intelligent Network Ltd, co. Add: 2003,20F No.35 Luojia creative city,Luoyu Road,Wuhan,HuBei Mob: +86 13797007811|Tel: + 86 27 5024 2516 发件人: Xiangfei Ni 发送时间: 2018年6月8日 13:37 收件人: user 主题:

Restoring snapshot

Dear Community, I’ll appreciate if I can get some responses to the observation below: https://stackoverflow.com/q/50763067/5701173 Thanks and regards, Vishal Sharma "Confidentiality Warning: This message and any attachments are intended only for the use of the intended recipient(s). are confid

Re: Size of a single Data Row?

Hi Jeff, thanks for that answer. I understand the problem now much better. As you explain the problem also exists in the VM and so also in the 'other' part of my application which is running on JavaEE/JPA. At the end the 100MB byte arrays also cause a HeapSpace problem there. So Cassandra is

compaction_throughput: Difference between 0 (unthrottled) and large value

Hello, on a 3 node loadtest cluster with very capable machines (32 physical cores, 512G RAM, 20T storage (26 disk RAID)), I'm trying to max out compaction, thus currently testing with: concurrent_compactors: 16 compaction_throughput_mb_per_sec: 0 With our simulated incoming load + compaction e