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docs/Single-server-VictoriaMetrics.md: mention that /internal/force_flush endpoint is mostly needed for testing and debugging

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Aliaksandr Valialkin 2020-11-16 23:31:53 +02:00
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docs/Single-server-VictoriaMetrics.md
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@ -1236,7 +1236,7 @@ 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. It is possible to flush in-memory buffers to persistent storage * 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. by requesting `/internal/force_flush` http handler. This handler is mostly needed for testing and debugging purposes.
* 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).