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alternator: document choice of RF

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After changing the choice of RF in a previous patch, let's update the
relevant part of docs/alternator.md.

Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20190825121201.31747-1-nyh@scylladb.com>
This commit is contained in:
Nadav Har'El
2019-08-25 15:12:00 +03:00
parent 2e68eafb22
commit 6b8224ef85
1 changed files with 6 additions and 2 deletions
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8
docs/alternator.md
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@@ -34,8 +34,12 @@ of a few seconds), or you should use a different mechanism to distribute
different DynamoDB requests to different Scylla nodes, to balance the load.
Alternator tables are stored as Scylla tables in the "alternator" keyspace.
This keyspace is initialized when Alternator first boots, with replication
factor hard-coded to 1 (FIXME: this will need to change).
This keyspace is initialized when the first Alternator table is created
(with a CreateTable request). The replication factor (RF) for this keyspace
and all Alternator tables is chosen at that point, depending on the size of
the cluster: RF=3 is used on clusters with three or more live nodes, and
RF=1 is used for smaller clusters. Such smaller clusters are, of course,
only recommended for tests because of the risk of data loss.
## Current compatibility with DynamoDB