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From Ben Slater <ben.sla...@instaclustr.com>
Subject Re: failure node rejoin
Date Mon, 17 Oct 2016 05:48:47 GMT
To cassandra, the node where you deleted the files looks like a brand new
machine. It doesn’t automatically rebuild machines to prevent accidental
replacement. You need to tell it to build the “new” machines as a
replacement for the “old” machine with that IP by setting
-Dcassandra.replace_address_first_boot=<dead_node_ip>.
See http://cassandra.apache.org/doc/latest/operating/topo_changes.html.

Cheers
Ben

On Mon, 17 Oct 2016 at 16:41 Yuji Ito <yuji@imagine-orb.com> wrote:

> Hi all,
>
> A failure node can rejoin a cluster.
> On the node, all data in /var/lib/cassandra were deleted.
> Is it normal?
>
> I can reproduce it as below.
>
> cluster:
> - C* 2.2.7
> - a cluster has node1, 2, 3
> - node1 is a seed
> - replication_factor: 3
>
> how to:
> 1) stop C* process and delete all data in /var/lib/cassandra on node2
> ($sudo rm -rf /var/lib/cassandra/*)
> 2) stop C* process on node1 and node3
> 3) restart C* on node1
> 4) restart C* on node2
>
> nodetool status after 4):
> Datacenter: datacenter1
> =======================
> Status=Up/Down
> |/ State=Normal/Leaving/Joining/Moving
> --  Address        Load       Tokens       Owns (effective)  Host ID
>                         Rack
> DN  [node3 IP]  ?                 256          100.0%
>  325553c6-3e05-41f6-a1f7-47436743816f  rack1
> UN  [node2 IP]  7.76 MB      256          100.0%
>  05bdb1d4-c39b-48f1-8248-911d61935925  rack1
> UN  [node1 IP]  416.13 MB  256          100.0%
>  a8ec0a31-cb92-44b0-b156-5bcd4f6f2c7b  rack1
>
> If I restart C* on node 2 when C* on node1 and node3 are running (without
> 2), 3)), a runtime exception happens.
> RuntimeException: "A node with address [node2 IP] already exists,
> cancelling join..."
>
> I'm not sure this causes data lost. All data can be read properly just
> after this rejoin.
> But some rows are lost when I kill&restart C* for destructive tests after
> this rejoin.
>
> Thanks.
>
> --
————————
Ben Slater
Chief Product Officer
Instaclustr: Cassandra + Spark - Managed | Consulting | Support
+61 437 929 798

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