问题描述
我有一个由Priam管理的Cassandra集群，有3个节点。我使用临时磁盘存储我的Cassandra数据，因此当我启动1个节点时，Cassandra数据目录为空。
I have a Cassandra cluster managed by Priam, with 3 nodes. I use ephemeral disks to store my Cassandra data, so when I start 1 node, the Cassandra data dir is empty.
我已经正确配置了Priam，并且可以看到备份保存在Amazon S3中。假设一个节点发生故障，然后启动另一个节点。当节点再次出现时，Priam是否知道如何从S3自动还原备份？ Cassandra数据目录将开始为空，因此我假设Priam将给新节点与旧节点相同的令牌，并且它将恢复数据...对吗？
I have Priam properly configured and I can see backups are saved in Amazon S3. Suppose a node goes down and then I start another node. Will Priam know how to automatic restore backup from S3 when the node comes up again? The Cassandra data dir will start empty, so I am assuming Priam would give the new node the same token as the old one and it would restore the data... Right?
推荐答案
是的。我一直在EC2上运行独立的Cassandra，在EC2上运行mesos上的小型Cassandra群集，在EC2上运行较大的DataStax Enterprise群集（使用Cassandra）。
Yes. I have been running standalone Cassandra on EC2, small Cassandra clusters on mesos on EC2, and larger DataStax Enterprise clusters (with Cassandra) on EC2.
我一直在使用Priam 3.x分支。
I have been using the Priam 3.x branch.
还原时，它将计算initial_token，更新cassandra.yaml文件，还原快照和增量备份文件，然后重新启动Cassandra。
On restore, it calculates the initial_token, updates the cassandra.yaml file, restores the snapshot and incremental backup files, and restarts Cassandra.
根据Priam / Netflix约定，如果您的Cassandra具有3节点群集，则您的节点应命名为some_thing-other-things。每个节点都应该是名为some_thing的自动缩放组的一部分。每个节点还应使用一个名为some_thing的安全组。
According to Priam/Netflix conventions, if you have a 3 node cluster with Cassandra, your nodes should be named some_thing-other-things. Each node should be a part of an Auto-scaling group called some_thing. Each node should also use a Security Group named some_thing.
创建一个3节点的开发集群，并使用可以轻松重新创建的数据测试备份和还原。不在乎。习惯于管理自动缩放组和Priam。然后，在测试集群中使用您关心的数据进行尝试。
Create a 3 node dev cluster and test your backups and restores with data that you can easily recreate, that you don't care about too much. Get used to managing the Auto-scaling groups and Priam. Then, try it on test clusters with data that you care about.
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