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From "Philip Thompson (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-9560) Changing durable_writes on a keyspace is only applied after restart of node
Date Tue, 09 Jun 2015 12:40:00 GMT


Philip Thompson commented on CASSANDRA-9560:

[~Fredderf], just an update, we're working on writing some test cases that reproduce the issue.

> Changing durable_writes on a keyspace is only applied after restart of node
> ---------------------------------------------------------------------------
>                 Key: CASSANDRA-9560
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Single node
>            Reporter: Fred
>             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:
> {|borderStyle=solid}
> public void apply()
> {
>    Keyspace ks =;
>     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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