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https://issues.apache.org/jira/browse/CASSANDRA-6648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13891351#comment-13891351
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Brandon Williams edited comment on CASSANDRA-6648 at 2/4/14 11:04 PM:
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v3, influenced by my last comment, removes the MM subscription to gossip and
instead is notified by SS after it has completed any onAlive/onJoin events.
isFatClient doesn't check aliveness, and MM.passiveAnnounce remains since
that's the only way the schema state gets populated in gossip.
was (Author: brandon.williams):
v3, influenced by my last comment, removes the MM subscription to gossip and
instead is notified by SS after it has completed any onAlive/onJoin events.
isFatClient doesn't check aliveness, and MM.passiveAnnounce remains since
that's the only the schema state gets populated in gossip.
> 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
> Attachments: 6648-v2.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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