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https://issues.apache.org/jira/browse/CASSANDRA-14346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420981#comment-16420981
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Blake Eggleston commented on CASSANDRA-14346:
---------------------------------------------
I think the problems that exist in C* with regard to understanding the state of
repairs and streams, and the inability to cancel them without restarting nodes
are orthogonal to talking about the best approach to coordinate them.
As far as I’m aware, it’s not currently possible for a repair to determine if
it’s taking a long time, finished with a lost notification, or stuck somewhere.
So that’s really a limitation in the design of how cassandra does individual
streams and repair sessions that should be solved regardless, and not really an
argument in favor of one approach or the other.
The auth concern makes sense, but unless this completely removes the need for
any sort of sidecar process, you’ll still have to deal with it.
> Scheduled Repair in Cassandra
> -----------------------------
>
> Key: CASSANDRA-14346
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14346
> Project: Cassandra
> Issue Type: Improvement
> Components: Repair
> Reporter: Joseph Lynch
> Priority: Major
> Labels: CommunityFeedbackRequested
> Fix For: 4.0
>
> Attachments: ScheduledRepairV1_20180327.pdf
>
>
> There have been many attempts to automate repair in Cassandra, which makes
> sense given that it is necessary to give our users eventual consistency. Most
> recently CASSANDRA-10070, CASSANDRA-8911 and CASSANDRA-13924 have all looked
> for ways to solve this problem.
> At Netflix we've built a scheduled repair service within Priam (our sidecar),
> which we spoke about last year at NGCC. Given the positive feedback at NGCC
> we focussed on getting it production ready and have now been using it in
> production to repair hundreds of clusters, tens of thousands of nodes, and
> petabytes of data for the past six months. Also based on feedback at NGCC we
> have invested effort in figuring out how to integrate this natively into
> Cassandra rather than open sourcing it as an external service (e.g. in Priam).
> As such, [~vinaykumarcse] and I would like to re-work and merge our
> implementation into Cassandra, and have created a [design
> document|https://docs.google.com/document/d/1RV4rOrG1gwlD5IljmrIq_t45rz7H3xs9GbFSEyGzEtM/edit?usp=sharing]
> showing how we plan to make it happen, including the the user interface.
> As we work on the code migration from Priam to Cassandra, any feedback would
> be greatly appreciated about the interface or v1 implementation features. I
> have tried to call out in the document features which we explicitly consider
> future work (as well as a path forward to implement them in the future)
> because I would very much like to get this done before the 4.0 merge window
> closes, and to do that I think aggressively pruning scope is going to be a
> necessity.
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