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https://issues.apache.org/jira/browse/CASSANDRA-19260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17830293#comment-17830293
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Michael Semb Wever commented on CASSANDRA-19260:
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missing results attachment ?
> org.apache.cassandra.tcm.ClusterMetadataService#commit does not catch up when
> rejected
> --------------------------------------------------------------------------------------
>
> Key: CASSANDRA-19260
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19260
> Project: Cassandra
> Issue Type: Bug
> Components: Transactional Cluster Metadata
> Reporter: David Capwell
> Assignee: Alex Petrov
> Priority: Normal
> Fix For: 5.1
>
> Attachments: ci_summary.html, ci_summary.json
>
>
> This was found in the cep-15-accord branch (CASSANDRA-18804). The test that
> found this was a simple benchmark test.
> 1) deploy a 6 node cluster
> 2) create a table
> 3) in parallel launch many accord transactions
> When accord gets a transaction it needs to make sure the table is “managed”
> by accord which uses TCM for this bookkeeping, this is just a List<TableId>
> in ClusterMetadata. We found that we detect that the table isn’t managed so
> we try to add it, we get a reject and the TCM epoch has not moved forward!
> Debugging this it looks like org.apache.cassandra.tcm.RemoteProcessor#commit
> is the root cause as it only seems to try to catch up if there is a messaging
> error and not a TCM rejection! Given that the caller to TCM is not able to
> find the epoch to “wait” on I feel that this is a TCM issue as TCM normally
> tries to make sure success/rejects are blocking, but in this one case it
> appears not to be so
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