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https://issues.apache.org/jira/browse/CASSANDRA-6648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ryan McGuire updated CASSANDRA-6648:
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Labels: qa-resolved (was: )
> Race condition during node bootstrapping
> ----------------------------------------
>
> Key: CASSANDRA-6648
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6648
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Sergio Bossa
> Assignee: Sergio Bossa
> Priority: Critical
> Labels: qa-resolved
> Fix For: 1.2.15, 2.0.5
>
> Attachments: 6648-v2.txt, 6648-v3-1.2.txt, 6648-v3.txt,
> CASSANDRA-6648.patch
>
>
> When bootstrapping a new node, data is "missing" as if the new node didn't
> actually bootstrap, which I tracked down to the following scenario:
> 1) New node joins token ring and waits for schema to be settled before
> actually bootstrapping.
> 2) The schema scheck somewhat passes and it starts bootstrapping.
> 3) Bootstrapping doesn't find the ks/cf that should have received from the
> other node.
> 4) Queries at this point cause NPEs, until when later they "recover" but data
> is missed.
> The problem seems to be caused by a race condition between the migration
> manager and the bootstrapper, with the former running after the latter.
> I think this is supposed to protect against such scenarios:
> {noformat}
> while (!MigrationManager.isReadyForBootstrap())
> {
> setMode(Mode.JOINING, "waiting for schema information to
> complete", true);
> Uninterruptibles.sleepUninterruptibly(1, TimeUnit.SECONDS);
> }
> {noformat}
> But MigrationManager.isReadyForBootstrap() implementation is quite fragile
> and doesn't take into account "slow" schema propagation.
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