In other words, what helps in load balancing? HDFS replication or Data center replication?
Best regards, Yamini Joshi On Sat, Oct 15, 2016 at 10:44 PM, Yamini Joshi <yamini.1...@gmail.com> wrote: > So HDFS is for durability while replication is for availability? I'm > assuming that the client is unaware of the replicated instance and queries > the DB with no knowledge of which instance/table will return the result. > > Best regards, > Yamini Joshi > > On Thu, Oct 13, 2016 at 11:46 AM, Josh Elser <josh.el...@gmail.com> wrote: > >> I'm not familiar with MongoDB. Perhaps someone else can confirm this for >> you. >> >> Yamini Joshi wrote: >> >>> So, can I say that if I have a table split across nodes (i.e. num >>> tablets > 1) and HDFS replication in my system, it is sort of equivalent >>> to a sharded and replicated mongo architecture? >>> >>> Best regards, >>> Yamini Joshi >>> >>> On Thu, Oct 13, 2016 at 11:06 AM, Josh Elser <josh.el...@gmail.com >>> <mailto:josh.el...@gmail.com>> wrote: >>> >>> The Accumulo (Data Center) Replication feature is for having >>> multiple active Accumulo clusters all containing the same data. >>> >>> HDFS provides replication as a means for durability of the data it >>> is storing. The files that Accumulo creates on one HDFS instance are >>> replicated by HDFS. This does not help if your entire cluster become >>> unavailable. That is what the data center replication Accumulo >>> feature solves. >>> >>> While both can be called "replication", they serve very different >>> purposes. >>> >>> >>> Yamini Joshi wrote: >>> >>> Hello >>> >>> I was going through some Accumulo docs and found out about >>> replication. >>> To enable replication,one needs to make some config settings as >>> described in >>> https://github.com/apache/accumulo/blob/master/docs/src/main >>> /asciidoc/chapters/replication.txt >>> <https://github.com/apache/accumulo/blob/master/docs/src/mai >>> n/asciidoc/chapters/replication.txt>. >>> I cannot seem to grasp the difference between this replication >>> conf and >>> the replication on HDFS level. What exactly is the use case for >>> replication? Are the replicated instances visible to the clients? >>> >>> Best regards, >>> Yamini Joshi >>> >>> >>> >
