Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/4080#discussion_r120343058
--- Diff: docs/monitoring/large_state_tuning.md ---
@@ -94,21 +94,11 @@ When a savepoint is manually triggered, it may be in
process concurrently with a
## Tuning Network Buffers
-The number of network buffers is a parameter that can currently have an
effect on checkpointing at large scale.
-The Flink community is working on eliminating that parameter in the next
versions of Flink.
-
-The number of network buffers defines how much data a TaskManager can hold
in-flight before back-pressure kicks in.
-A very high number of network buffers means that a lot of data may be in
the stream network channels when a checkpoint
-is started. Because the checkpoint barriers travel with that data (see
[description of how checkpointing
works](../internals/stream_checkpointing.html)),
-a lot of in-flight data means that the barriers have to wait for that data
to be transported/processed before arriving
-at the target operator.
-
-Having a lot of data in-flight also does not speed up the data processing
as a whole. It only means that data is picked up faster
-from the data source (log, files, message queue) and buffered longer in
Flink. Having fewer network buffers means that
-data is picked up from the source more immediately before it is actually
being processed, which is generally desirable.
-The number of network buffers should hence not be set arbitrarily large,
but to a low multiple (such as 2x) of the
-minimum number of required buffers.
-
+Previously, an increased number of network buffers also caused increased
checkpointing times since
--- End diff --
Replace "Previously" with an absolute reference, i.e "Before 1.3".
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