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https://issues.apache.org/jira/browse/CASSANDRA-13972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16214611#comment-16214611
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Vedant commented on CASSANDRA-13972:
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Thanks for the clarification. At this point of time I don't have enough info
to say it is a bug. I have posted to user list here -
https://lists.apache.org/thread.html/156b1050d8af6200a3b0426d404ebc542622063b07cd54bcf97979fb@%3Cuser.cassandra.apache.org%3E
Pls comment if you have any pointers.
> Replication delays due to issues with inter node communication across
> multiple data centers, hints are piling up
> ----------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-13972
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13972
> Project: Cassandra
> Issue Type: Bug
> Components: Configuration
> Environment: This is for Cassandra 2.1.13. At times there are
> replication delays across multiple regions. Data is available (getting
> queried from command line) in 1 region but not seen in other region(s). This
> is not consistent. It is cluster spanning multiple data centers with total >
> 30 nodes. Keyspace is configured to get replicated in all the data centers.
> Hints are getting piled up in the source region. This happens especially for
> large data payload (appro 1kb to few MB blobs). Network level congestion or
> saturation does not seem to be an issue. There is no memory/cpu pressure on
> individual nodes.
> I am attaching Cassandra.yaml, any pointers on what can be tuned are highly
> appreciated. Let me know if you need any other info.
> We tried bumping up hinted_handoff_throttle_in_kb: 30720 and handoff tends to
> be slower max_hints_delivery_threads: 12 on one of the nodes to see if it
> speeds up hints delivery, there was some improvement but not whole lot.
> Reporter: Vedant
> Priority: Blocker
> Attachments: cassandra.yaml
>
>
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