[jira] [Updated] (CASSANDRA-13860) Make pulling schema from remote nodes more lightweight

["Aleksey Yeschenko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-13860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksey Yeschenko updated CASSANDRA-13860:
------------------------------------------
    Issue Type: Sub-task  (was: Improvement)
        Parent: CASSANDRA-9424

> Make pulling schema from remote nodes more lightweight
> ------------------------------------------------------
>
>                 Key: CASSANDRA-13860
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13860
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Distributed Metadata
>            Reporter: Aleksey Yeschenko
>             Fix For: 4.x
>
>
> Our current mechanism for resolving schema differences detected via gossip is quite heavyweight: we request the complete schema from a node, which often results in some very heavy mutations. But in most cases this shouldn't be necessary, as the delta is usually quite small.
> We may want to instead negotiate the difference based on schema graph merkle tree (all -> keyspace -> tables/views/types/etc.). This assumes that by then we'd switch to calculating schema digests bases on in-memory representation of {{Schema}}, without going to disk.



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