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README.md: mention that -retentionPeriod must cover the backfilled data

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Aliaksandr Valialkin 2019-08-24 13:48:54 +03:00
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README.md
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@ -687,6 +687,8 @@ The most interesting metrics are:
### Backfilling
Make sure that configured `-retentionPeriod` covers timestamps for the backfilled data.
It is recommended disabling query cache with `-search.disableCache` command-line flag when writing
historical data with timestamps from the past, since the cache assumes that the data is written with
the current timestamps. Query cache can be enabled after the backfilling is complete.