[CASSANDRA-13079] Warn user to run full repair when increasing replication factor - ASF JIRA

XML

Word

Printable

JSON

Scenario:
Start two nodes cluster.

Create keyspace with rep.factor one:
CREATE KEYSPACE rep WITH replication =

{'class': 'SimpleStrategy', 'replication_factor': 1}

;
CREATE TABLE rep.data (str text PRIMARY KEY );
INSERT INTO rep.data (str) VALUES ( 'qwerty');

Run nodetool flush on all nodes. On one of them table files are created.

Change replication factor to two:
ALTER KEYSPACE rep WITH replication =

{'class': 'SimpleStrategy', 'replication_factor': 2}

;

Run repair, then nodetool flush on all nodes. On all nodes table files are created.

Change replication factor to one:
ALTER KEYSPACE rep WITH replication =

{'class': 'SimpleStrategy', 'replication_factor': 1}

;

Then nodetool cleanup, only on initial node remained data files.

Change replication factor to two again:
ALTER KEYSPACE rep WITH replication =

{'class': 'SimpleStrategy', 'replication_factor': 2}

;

Run repair, then nodetool flush on all nodes. No data files on second node (though expected, as after first repair/flush).