Cassandra nodetool repair中的PR选项

Cassandra nodetool repair中的pr选项的官方解释是

Use -pr to repair only the first range returned by the partitioner.

那么什么时候用-pr选项,什么时候不用-pr呢?要解答这个问题首先要理解pr的意思

cassandra的数据可以有多份复制,比如说A,B,C,D四个节点,keyspace的replication factor为2

那么每份数据有两个copy,一个为primary,一个为replica

A节点上有range (D,A)的primary数据,同时也有range(C,D)的replica数据。如果在A节点上跑

nodetool repair -pr 那么会在A节点和B节点上同步range (D,A)的数据

如果是跑 nodetool repair 不加pr选项,那么会在
1. A节点和B节点上同步range (D,A)的数据
2. A节点和D节点上同步range (C,D)的数据

所以,如果你是为了处理delete的问题进行的日常的repair,可以使用-pr选项,在每个节点上跑一次。如果不加pr选项在每个节点上跑一次的话,会多做了重复的工作。再比如说增大replication factor,也可以使用-pr选项,在每个节点上跑。

如果是某个节点做recover操作的话,应该在该节点上不加pr选项,这样不单是同步了master的数据段,同样也同步了replica的数据段。如果是某个节点down掉,nodetool rebuild应该更快

另外,如果是多个data center, NetworkTopologyStrategy,可以加-local选项加快repair的速度
Use -local to only repair against nodes in the same data center.
最好使用CF级别的repair,将一个keyspace下的CF一个个的repair。

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