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Let's assume we have a Cassandra cluster with the following ring: A -> B -> C -> D (no virtual nodes), and we assume that all the data is stored at RF=2. Now let's say that B dies, leaving us with the following ring A -> C -> D. Which means that C will need the replica of A's primary range and D the replica of B's primary range. (B's primary range do not need to be copied to C because C already holds a replica).

My questions are the following:

  • If I run nodetool repair on C it will get a copy of A's primary range, but will it stream a copy of B's primary range to D?
  • If I run nodetool repair -pr on A will it stream it's primary range to C?
  • If I run nodetool repair -pr on C will it stream B's primary range to D?
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1 Answers1

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This question was asked, and answered on StackOverflow, Clarifications about nodetool repair -pr.

To answer this question here, the answers are:

  • Yes.
  • Yes.
  • Yes.
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