Naoki Shiota, NEC Japan
- Thanks
- ramcloud approach to datacenters: interesting
- I am new to datacenter technology
- My research group is discussing how to construct future ITS (Intelligent Transportation Systems) - technology being supported by ramcloud could be interesting to discuss
- Will take this information (things i heard about here) back and discuss with my group.
Sanjeev Datla - Emulex
- Was here last time
- This time significantly more people on RAMCloud compared to last time.
- Our standpoint - want to look at DCTCP protocols - being worked on in Balaji's group.
- Want to see how to fund underlying infrastructure on what you're on working here.
- How to architect stuff to address some of the probes you're trying to address with the software stuff
- Bill's talk - very useful
- Heard a lot about a lot of very practical stuff - customers also talk about these issues - e.g., low latency
- Interested in seeing use of building blocks from lower things to general systems
Sachin Kulkarni - Facebook
- Retreat: loved it, learnt a lot, interesting
- ramcloud:
- would like to see multi tier architecture on core stuff - eg., as in databases
- instead of relying completely on software, how we can get hardware to do some work
- richer datamodel to key val store - expressive queries - richer interface with data
- because we'll be replaces db with ramcloud
- mincopyset - interesting. want to use with haystack. if other people in industry use - let me know
- bills talk - loved it.
- rdma - good insight
- berk - already knew about it
Venkat Venkataramani - Facebook
- enjoyed; got to meet smart people
- want more people (students) from here to come back to fb and talk to more engineers about work you're doing
- couple ideas:
- at FB, there's a growing use of state mgmt of transient data (e.g., how many people are looking at the photo i am looking at right now)
- keeping track of this - next to impossible
- we built in-memory datastore to serve this
- there's a growing category of apps - ramcloud can not only replace db, but also help new use cases which are very write heavy
- Backups + compaction: Can you do an offline backup at the same time as doing disk based log cleaning?
- key val stores are great. but some facilities to provide to users to manage their own schema
- wants features for schema migration. a problem they have is that applications have to update schemas on the fly. one idea is to register transformers to the server so that code doesn't have to live in the application.
- not (just) coming with data model, but provide primitives where people can come up with data model.
- we're hiring - a lot
Shinji Nakadai, NEC
- we're doing research related to metadata for distributed systems like bigtable
- in such systems coordinator generally becomes bottleneck
- i believe that ramcloud coordinator can probably handle the requests, but would like to see the result
- would like ramcloud to support the trigger and stored procedures
- afaik, distributed key val stores used largely by financial industry
- diff from memcached, a key val store that handles replicates, supports trigger
- in international industry, sys that reduces 1 ms makes money
- they want key val store, and trigger
Ali Ayoub, Mellanox
- Thanks
- interesting to see progress since last year, esp in ramcloud
- looking forward to ramcloud 1.0 - looking forward to do experiments
- any project that has a kernel module - have more discussion in linux kernel community - they can contribute
- ramcloud wiki page - very helpful, help learn a lot. things are added as they're happening - helpful. Continue keeping it updated
- rdma - nice to see how it can improve performance a lot - this is technology that's not mainstream (and its great to see that happen) - changes baseline
- in general, seeing techniques you try and their analysis - was a good exposure to learn about your project, and for our own future projects
- when latency is very imp - lot of attention is paid to overheads. any component that requires lot of sw - hw can help - when it is possible that hw can offload, go and show the vendor how hw can come into picture
- i hope i can join next year to see updates some projects from last year, like r2d2, wanted to see update, paper etc
- would like to see status update at the retreat next year
Deepak Kenchammana - NetApp
- Part that was most satisfying and want to see even more - experimentation - e.g., loved talks on rdma, and data from fb - even if its still raw
- systems that are driven by analysis of real data - are neat. we build lot of systems from intuition. so its great to see this (systems being driven by analysis of data) happening. keep this up.
- ramcloud: finally is going to include backend storage that is much slower - separation between access latencies upstream and cold, slow storage - how do you take care of these tiers - how do you warm up these caches, and working sets - how are you going to use high capacity, slow storage at the backend, and still provide high performance to apps
- Basically, think beyond RAM - datasets are going to be much larger than would fit in RAM
- dctcp: really want to see bsd implementation
- data center scheduling problem (Chritisina): think about: caching is becoming imp for app perf - scheduling becomes very constrained - can do you do something about moving things to places where there is common data that's already in cache - that will help improve data center scheduling.
- logistics: great place, very well organized, perfect time, right distance for bay area people