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From Daniel Hölbling-Inzko <>
Subject Re: Data Loss irreparabley so
Date Thu, 27 Jul 2017 07:38:20 GMT
In that vein, Cassandra support Auto compaction and incremental repair.
Does this mean I have to set up cron jobs on each node to do a nodetool
repair or is this taken care of by Cassandra anyways?
How often should I run nodetool repair

Greetings Daniel
Jeff Jirsa <> schrieb am Do. 27. Juli 2017 um 07:48:

> On 2017-07-25 15:49 (-0700), Roger Warner <> wrote:
> > This is a quick informational question.     I know that Cassandra can
> detect failures of nodes and repair them given replication and multiple DC.
> >
> > My question is can Cassandra tell if data was lost after a failure and
> node(s) “fixed” and resumed operation?
> >
> Sorta concerned by the way you're asking this - Cassandra doesn't "fix"
> failed nodes. It can route requests around a down node, but the "fixing" is
> entirely manual.
> If you have a node go down temporarily, and it comes back up (with it's
> disk intact), you can see it "repair" data with a combination of active
> (anti-entropy) repair via nodetool repair, or by watching 'nodetool
> netstats' and see the read repair counters increase over time (which will
> happen naturally as data is requested and mismatches are detected in the
> data, based on your consistency level).
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