rkhachatryan commented on a change in pull request #18431:
URL: https://github.com/apache/flink/pull/18431#discussion_r790783796
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File path: docs/content/docs/ops/state/state_backends.md
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@@ -325,6 +325,126 @@ public class MyOptionsFactory implements
ConfigurableRocksDBOptionsFactory {
{{< top >}}
+## Enabling Changelog
+
+// todo: Chinese version of all changed docs
+
+// todo: mention in [large state tuning]({{< ref
"docs/ops/state/large_state_tuning" >}})? or 1.16?
+
+{{< hint warning >}} The feature is in experimental status. {{< /hint >}}
+
+{{< hint warning >}} Enabling Changelog may have a negative performance impact
on your application (see below). {{< /hint >}}
+
+### Introduction
+
+Changelog is a feature that aims to decrease checkpointing time, and therefore
end-to-end latency in exactly-once mode.
+
+Most commonly, checkpoint duration is affected by:
+
+1. Barrier travel time and alignment, addressed by
+ [Unaligned checkpoints]({{< ref
"docs/ops/state/checkpointing_under_backpressure#unaligned-checkpoints" >}})
+ and [Buffer debloating]({{< ref
"docs/ops/state/checkpointing_under_backpressure#buffer-debloating" >}})
+2. Snapshot creation time (so-called synchronous phase), addressed by
Asynchronous snapshots
Review comment:
I agree, it's confusing.
What I mean here is minimizing the synchronous phase duration by using some
form of persistent data structures (CoW for Heap and immutable SSTables in
RocksDB).
This is
[called](https://nightlies.apache.org/flink/flink-docs-release-1.14/docs/ops/state/state_backends/#the-embeddedrocksdbstatebackend)
asynchronous checkpoints/snapshots.
WDYT about
```
2. Snapshot creation time (so-called synchronous phase), reduced by
immutable (or asynchronous) snapshots.
```
Or maybe just remove the clarification?
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