Measuring sync time for new node in cluster

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Mike Tihonchik

<mike.tihonchik@gmail.com>

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Oct 19, 2022, 5:10:33 PM10/19/22

to ScyllaDB users

I was reading this article:

Efficiently Maintaining Consistency with Row-Level Repair

and I was wondering how did the team measured that it took 37.07min for a "0% sync" scenario. I was wondering, how was that calculation obtained? Is there certain metrics I should look int?

Thank you

Asias He

<asias@scylladb.com>

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Oct 19, 2022, 8:54:36 PM10/19/22

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It is 0% synced which means one of the nodes has zero data. The time 37.07min is the time to finish the repair cmd, e.g., time nodetool repair myks mytable.

To add a new node, we should use the add node procedure, not add an empty node and run repair on that node.