Tuning NodeSync validations
NodeSync tries to validate all tables within their respective deadlines, while respecting the configured rate limit.
If a table is 10GB and has a
deadline_target_sec=10 and the rate_in_kb is set to 1MB/sec, validation will not happen quickly enough.
Configure the rate and deadlines realistically, take data sizes into account and adapt with data growth.
For write-heavy workloads, where more than 20% of the operations are writes, you may notice CPU consumption overhead associated with NodeSync.
If that’s the case for you environment, DataStax recommends using
NodeSync records warnings to the
system.log, if it detects any of the following conditions: