Blake Eggleston created CASSANDRA-19009:
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Summary: CEP-15: (C*/Accord) Schema based fast path
reconfiguration
Key: CASSANDRA-19009
URL: https://issues.apache.org/jira/browse/CASSANDRA-19009
Project: Cassandra
Issue Type: Improvement
Components: Accord
Reporter: Blake Eggleston
This adds availability aware accord fast path reconfiguration, as well as user
configurable fast path settings, which are set at the keyspace level and
(optionally) at the table level for increased granularity.
The major parts are:
*Add availability information to cluster metadata*
Accord topology in C* is not stored in cluster metadata, but is meant to
calculated deterministically from cluster metadata state at a given epoch. This
adds the availability data, as well as the failure detector / gossip listener
and state change deduplication to CMS.
*Move C* accord keys/topology from keyspace prefixes to tableid prefixes*
To support per-table fast path settings, topologies and keys need to include
the table id. Since accord topologies could begin to consume a lot of memory in
clusters with a lot of nodes and tables, topology generation has been updated
to reuse previously allocated shards / shard parts where possible, which will
only increase heap sizes when things actually change.
*Make fast path settings configurable via schema*
There are 2.5 strategies: Simple, Parameterized, and InheritKeyspaceSettings.
Simple will use as many available nodes as possible for the fast path
electorate, this is the default for the keyspace fast path strategy.
Parameterized allows you to set a target size, and preferred datacenters for
the FP electorate. InheritKeyspace tells topology generation to just use the
keyspace fast path settings, and is the default for the table fast path
strategy.
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