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docs/Single-server-VictoriaMetrics.md: document /internal/force_flush endpoint

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Aliaksandr Valialkin 2020-11-13 18:43:04 +02:00
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docs/CHANGELOG.md
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@ -13,6 +13,8 @@
* FEATURE: consistently return text-based HTTP responses such as `plain/text` and `application/json` with `charset=utf-8`. * FEATURE: consistently return text-based HTTP responses such as `plain/text` and `application/json` with `charset=utf-8`.
See https://github.com/VictoriaMetrics/VictoriaMetrics/pull/897 See https://github.com/VictoriaMetrics/VictoriaMetrics/pull/897
* FEATURE: update Go builder from v1.15.4 to v1.15.5. This should fix [these issues in Go](https://github.com/golang/go/issues?q=milestone%3AGo1.15.5+label%3ACherryPickApproved). * FEATURE: update Go builder from v1.15.4 to v1.15.5. This should fix [these issues in Go](https://github.com/golang/go/issues?q=milestone%3AGo1.15.5+label%3ACherryPickApproved).
* FEATURE: added `/internal/force_flush` http handler for flushing recently ingested data from in-memory buffers to persistent storage.
See [troubleshooting docs](https://victoriametrics.github.io/#troubleshooting) for more details.
* BUGFIX: do not return data points in the end of the selected time range for time series ending in the middle of the selected time range. * BUGFIX: do not return data points in the end of the selected time range for time series ending in the middle of the selected time range.
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/887 and https://github.com/VictoriaMetrics/VictoriaMetrics/issues/845 See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/887 and https://github.com/VictoriaMetrics/VictoriaMetrics/issues/845

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docs/Single-server-VictoriaMetrics.md
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@ -1211,7 +1211,8 @@ VictoriaMetrics also exposes currently running queries with their execution time
* VictoriaMetrics buffers incoming data in memory for up to a few seconds before flushing it to persistent storage. * VictoriaMetrics buffers incoming data in memory for up to a few seconds before flushing it to persistent storage.
This may lead to the following "issues": This may lead to the following "issues":
* Data becomes available for querying in a few seconds after inserting. * Data becomes available for querying in a few seconds after inserting. It is possible to flush in-memory buffers to persistent storage
by requesting `/internal/force_flush` http handler.
* The last few seconds of inserted data may be lost on unclean shutdown (i.e. OOM, `kill -9` or hardware reset). * The last few seconds of inserted data may be lost on unclean shutdown (i.e. OOM, `kill -9` or hardware reset).
See [this article for technical details](https://valyala.medium.com/wal-usage-looks-broken-in-modern-time-series-databases-b62a627ab704). See [this article for technical details](https://valyala.medium.com/wal-usage-looks-broken-in-modern-time-series-databases-b62a627ab704).