Cassandra Summit Japan 2014
Last Friday, I attended the event. Let me share my feedback here.
Cassandra community in japan
In the opening talk, Tomita-san mentioned the tough situation of the community.
Current status of cassandra community in japan is tough. Few japanese docs on web. Even the small amount of public docs are tend to out of date. Poor relationship between the developers, unfortunately. But now the core community member has been preparing the consortium to solve the above issues.
Cassandra 2.0 and 2.1
Mr.Jonathan Ellis explained some of the new features in the 2.x. the following points seem significant in particular, I think.
1. Consistency level 'Serial'
we can see the details more in their blog post.
2. On-heap/Off-heap (Memory optimisation)
Utilize memory space outside of the heap to access the metadata more quickly than from disk.
3. Hyperloglog (HLL)
Use the algorithm to improve Bloom filter quality in case of inefficient SSTable size for compaction.
Paxos
Every Datastax guys emphasized its low performance again and again. They implement that consensus algorithm to add the new consistency level by themselves without any external product such as Zookeeper but also noted the trade off to the performance.
100 nodes cluster admin operation in CyberAgent
@oranie-san from CA made presentation about their experience through the operation with the version 1.1 cluster.
His presentation was really straightforward and practical. everyone seemed to learn the difficulty and the strength of Cassandra from this.
Anyway, I have never known where the famous phrase comes from. apparently that is from CA.
'鬼の哭くシステム'
But unfortunately and naturally any Datastax guys seemed not to see the joke at that moment.
At last, I just would like to say thank you to all the host members! I really enjoyed it. Thanks!