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config: enable new sharding algorithm for new deployments

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Set murmur3_partitioner_ignore_msb_bits to 12 (enabling the new sharding
algorithm), but do this in scylla.yaml rather than the built-in defaults.
This avoids changing the configuration for existing clusters, as their
scylla.yaml file will not be updated during the upgrade.
Message-Id: <20170214123253.3933-1-avi@scylladb.com>
This commit is contained in:
Avi Kivity
2017-02-14 14:32:53 +02:00
committed by Tomasz Grabiec
parent 0a4edca756
commit 9b113ffd3e
1 changed files with 20 additions and 0 deletions
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20
conf/scylla.yaml
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@@ -783,3 +783,23 @@ commitlog_total_space_in_mb: -1
# By default, Scylla binds all interfaces to the prometheus API
# It is possible to restrict the listening address to a specific one
# prometheus_address: 0.0.0.0
# Distribution of data among cores (shards) within a node
#
# Scylla distributes data within a node among shards, using a round-robin
# strategy:
# [shard0] [shard1] ... [shardN-1] [shard0] [shard1] ... [shardN-1] ...
#
# Scylla versions 1.6 and below used just one repetition of the pattern;
# this intefered with data placement among nodes (vnodes).
#
# Scylla versions 1.7 and above use 4096 repetitions of the pattern; this
# provides for better data distribution.
#
# the value below is log (base 2) of the number of repetitions.
#
# Set to 0 to avoid rewriting all data when upgrading from Scylla 1.6 and
# below.
#
# Keep at 12 for new clusters.
murmur3_partitioner_ignore_msb_bits: 12