Hey Henning, Almost everything is stored in bitcask, but for some > progress-information-items, we are using the memory backend with > automatic expiration. Thus, the multibackend is being configured > (app.config for the old nodes, riak.conf for the new nodes). In the > past, I have configured bucket properties in Java (here in > riak-java-client 2 syntax):
... > Is this equivalent to specifying a bucket type? Not exactly, that code will set the backend for that bucket, which is in the default bucket type. If you need to specify a bucket-type, it's just an extra parameter on the Namespace ctor: Namespace ns = new Namespace(bucketType, bucketName); If you'd like everything in a bucket-type to be on the memory backend, you should be able to specify that backend in the bucket type properties when creating it with riak-admin. The bucket type'd namespace wont' be available to the old Riak nodes though :/ How does a cluster behave where some nodes have the multibackend configured (in riak.conf), and others not (because you forgot)? > What happens if you configure the multibackend afterwards? Is the > bucket with all its data being migrated? Can you detect in which > *backend* an object is located? Anything without the multibackend config should automatically save/load to whatever the configured (or default) backend is. If you configure it afterwards, the data won't be available b/c it's on a backend it's now not configured for. If you need to move it, it's possible to use Multi-backend + a temp bucket to move the data from the old backend to the new one - it's a bit of a procedure though. Thanks, Alex On Tue, Aug 9, 2016 at 10:42 AM, Henning Verbeek <hankipa...@gmail.com> wrote: > We're slowly migrating our application from Riak KV 1.4 to Riak KV > 2.1.4, and at the same time riak-java-client 1.4.x to riak-java-client > 2.0.6. We are doing this by adding seven new Riak KV 2.1 nodes to the > ring, and later removing the seven Riak KV 1.4 nodes from the ring. > For a few days, the cluster will consist of a mix. > > Almost everything is stored in bitcask, but for some > progress-information-items, we are using the memory backend with > automatic expiration. Thus, the multibackend is being configured > (app.config for the old nodes, riak.conf for the new nodes). In the > past, I have configured bucket properties in Java (here in > riak-java-client 2 syntax): > > Namespace ns = new Namespace(bucketName); > StoreBucketProperties.Builder builder = new > StoreBucketProperties.Builder(ns); > builder.withBackend(backendName); > riakClient.execute(builder.build()); > > Is this equivalent to specifying a bucket type? > > How does a cluster behave where some nodes have the multibackend > configured (in riak.conf), and others not (because you forgot)? > What happens if you configure the multibackend afterwards? Is the > bucket with all its data being migrated? Can you detect in which > *backend* an object is located? > > Thanks guys! Cheers, Henning > -- > My other signature is a regular expression. > http://www.pray4snow.de > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com >
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