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From Alexander Dejanovski <a...@thelastpickle.com>
Subject Re: [cassandra 3.6.] Nodetool Repair + tombstone behaviour
Date Thu, 29 Sep 2016 09:19:42 GMT
Hi Atul,

could you be more specific on how you are running repair ? What's the
precise command line for that, does it run on several nodes at the same
time, etc...
What is your gc_grace_seconds ?
Do you see errors in your logs that would be linked to repairs (Validation
failure or failure to create a merkle tree)?

You seem to mention a single node that went down but say the whole cluster
seem to have zombie data.
What is the connection you see between the node that went down and the fact
that deleted data comes back to life ?
What is your strategy for cyclic maintenance repair (schedule, command line
or tool, etc...) ?

Thanks,

On Thu, Sep 29, 2016 at 10:40 AM Atul Saroha <atul.saroha@snapdeal.com>
wrote:

> Hi,
>
> We have seen a weird behaviour in cassandra 3.6.
> Once our node was went down more than 10 hrs. After that, we had ran
> Nodetool repair multiple times. But tombstone are not getting sync properly
> over the cluster. On day- today basis, on expiry of every grace period,
> deleted records start surfacing again in cassandra.
>
> It seems Nodetool repair in not syncing tomebstone across cluster.
> FYI, we have 3 data centres now.
>
> Just want the help how to verify and debug this issue. Help will be
> appreciated.
>
>
> --
> Regards,
> Atul Saroha
>
> *Lead Software Engineer | CAMS*
>
> M: +91 8447784271
> Plot #362, ASF Center - Tower A, 1st Floor, Sec-18,
> Udyog Vihar Phase IV,Gurgaon, Haryana, India
>
> --
-----------------
Alexander Dejanovski
France
@alexanderdeja

Consultant
Apache Cassandra Consulting
http://www.thelastpickle.com

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