[jira] [Assigned] (CASSANDRA-9560) Changing durable_writes on a keyspace is only applied after restart of node

["Carl Yeksigian (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-9560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Carl Yeksigian reassigned CASSANDRA-9560:
-----------------------------------------

    Assignee: Carl Yeksigian

> Changing durable_writes on a keyspace is only applied after restart of node
> ---------------------------------------------------------------------------
>
>                 Key: CASSANDRA-9560
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9560
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Single node
>            Reporter: Fred
>            Assignee: Carl Yeksigian
>             Fix For: 2.1.x
>
>
> When mutations for a column family is about to be applied, the cached instance of the keyspace metadata is read. But the schema mutation for durable_writes hasn't been applied to this cached instance.
> I'm not too familiar with the codebase but after some debugging (2.1.3), it's somehow related to:
> {code:title=org.apache.cassandra.db.Mutation.java|borderStyle=solid}
> public void apply()
> {
>    Keyspace ks = Keyspace.open(keyspaceName);
>     ks.apply(this, ks.metadata.durableWrites);
> }
> {code}
> Where a cached instance of the keyspace is opened but it's metadata hasn't been updated with the earlier applied durable_writes mutation, since it seems that the cached keyspace instance is lazily build at startup but after that, never updated. I'm also a little bit concerned if other values in the cached keyspace instance suffers from the same issue, e.g. replication_factor... 
> I've seen the same issue in 2.1.5 and the only way to resolve this issue is to restart the node to let the keyspace instance cache reload from disk.



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