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https://issues.apache.org/jira/browse/CASSANDRA-14771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16622772#comment-16622772
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Benedict edited comment on CASSANDRA-14771 at 9/20/18 9:58 PM:
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Just for clarity of future readers, per CASSANDRA-14768, we might still want to
*write* to transient nodes if, due to timeouts on writes to full nodes, we fail
to reach {{QUORUM}} in any given DC. But we wouldn't pick any upfront since
we'd fail with unavailable if we can't find enough full to write to, would not
*rapid write protection* to them, and would not block our response on them.
Probably this can fairly easily be implemented by narrowing the candidates set
to only the full replicas to prevent speculation, and using a simple
{{AbstractWriteResponseHandler}} with {{blockFor}} set to the full node count.
was (Author: benedict):
Just for clarity of future readers, per CASSANDRA-14768, we might still want to
*write* to transient nodes if, due to timeouts on writes to full nodes, we fail
to reach {{QUORUM}} in any given DC. But we wouldn't pick any upfront since
we'd fail with unavailable if we can't find enough full to write to, would not
*speculate* to them, and would not block our response on them.
Probably this can fairly easily be implemented by narrowing the candidates set
to only the full replicas to prevent speculation, and using a simple
{{AbstractWriteResponseHandler}} with {{blockFor}} set to the full node count.
> Transient Replication: Writes at CL.ALL should block on all full replicas,
> but not transients
> ----------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-14771
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14771
> Project: Cassandra
> Issue Type: Bug
> Components: Coordination
> Reporter: Ariel Weisberg
> Priority: Major
> Fix For: 4.0
>
>
> Reading at ONE will still be safe because ONE only selects full replicas.
> There is no reason to write to transients if we are going to block on all
> full replicas.
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