[jira] [Updated] (CASSANDRA-19009) CEP-15: (C*/Accord) Schema based fast path reconfiguration

["Michael Semb Wever (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-19009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Semb Wever updated CASSANDRA-19009:
-------------------------------------------
    Fix Version/s:     (was: 5.0.x)

> 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
>            Assignee: Blake Eggleston
>            Priority: Normal
>             Fix For: 5.0-rc1, 5.0
>
>
> 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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