On 9 October 2013 01:57, Milind Bhandarkar <mbhandar...@gopivotal.com>wrote:
> Yes, we have. It works very well, but it is considered too niche by folks > who insist on buying the least capable hardware for their test clusters, > and therefore, recommend such underpowered clusters to customers as well. > surely you meant to say "take advantage of the cost model of JBOD storage and ethernet to allow data to be stored and accessed at significantly lower price points than for legacy storage architectures and pricing models -so enabling their customers to store and process data they would have previously had to discard" (0) IB should be most interesting at the app level -for apps > classic MR. That's giraph, streaming work, Tez. I'd like to see some numbers there. As the oracle For storage, IB would make locality less of an issue (1,2), and instead make the level of storage: SSD vs HDD more significant in terms of performance (2). There is ongoing work there in a set of JIRAs about multi-tier storage. I don't know the current state of Hadoop on IB, or even if allocateDirect() of NIO has been picked up. For IPC there should be some latency improvements, while for the Datanodes its the bulk data you want to push around faster. If you want to work on either of those problems you'd be very welcome. (0) I also have a VMWare test cluster for some HA work and VM capacity from Rackspace for a broader pool of deployment options. (1) Hadoop 2.1 supports Unix Domain Sockets for a direct-yet-secure connection from a local app (HBase, ...) and the Datanode. This bypasses the network stack entirely (2) http://nowlab.cse.ohio-state.edu/publications/conf-papers/2010/sur-masvdc10.pdf (3) http://www.cs.berkeley.edu/%7Eganesha/disk-irrelevant_hotos2011.pdf -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
