#20214
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Ran 23 Mar 2026 07:35AM UTC

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Files 630

Run time 2min

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Committed 23 Mar 2026 07:23AM UTC coverage: 88.696% (+0.01%) from 88.686%

Build # #20214

Build Type

push

github

Committed by

web-flow

Commit Message

docs: Correct the manual flow control README regarding onNext blocking (#12700)

### Description
This PR updates the "Outgoing Flow Control" section in the Manual Flow
Control example's README.

The previous documentation incorrectly implied that calling `onNext()`
on a stream would block if the underlying Netty buffer was full, thereby
limiting the send rate. This PR clarifies that `onNext()` does *not*
block, but rather queues the messages in memory, which can ultimately
lead to an `OutOfMemoryError` if messages are sent too quickly.

The updated text correctly advises developers to use
`CallStreamObserver.isReady()` to prevent this memory exhaustion, rather
than to avoid blocking.

Fixes #12657

---------

Co-authored-by: Kannan J <kannanjgithub@google.com>

Run Details

35481 of 40003 relevant lines covered (88.7%)

0.89 hits per line

Uncovered Existing Lines

Lines	Coverage	∆	File
1	88.14	-0.4%	../core/src/main/java/io/grpc/internal/DelayedClientCall.java
1	87.6	-0.83%	../rls/src/main/java/io/grpc/rls/LinkedHashLruCache.java

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ID	Job ID	Ran	Files	Coverage
1	#20214.1	23 Mar 2026 07:35AM UTC	630	88.7

grpc / grpc-java / #20214
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