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new 1a69ba80 [hotfix] Add note for testing immediate data with sql-client
1a69ba80 is described below
commit 1a69ba80d34d5578655aaff7b1c88c46f46d17f6
Author: JingsongLi <[email protected]>
AuthorDate: Tue Aug 2 10:33:24 2022 +0800
[hotfix] Add note for testing immediate data with sql-client
---
docs/content/docs/development/streaming-query.md | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/docs/content/docs/development/streaming-query.md
b/docs/content/docs/development/streaming-query.md
index 532e8b13..2b47a27e 100644
--- a/docs/content/docs/development/streaming-query.md
+++ b/docs/content/docs/development/streaming-query.md
@@ -130,6 +130,11 @@ that the streaming reading has transactional consistency.
Immediate data visibility is configured via
`log.consistency` = `eventual`.
+{{< hint info >}}
+__Note:__ Use `SELECT` in the sql-client does not get immediate data, the
collect sink generated by select relies
+on the checkpoint mechanism. The more recommended way to test is to use a
print sink.
+{{< /hint >}}
+
Due to the tradeoff between data freshness and completeness, immediate data
visibility is barely
accomplished under exactly-once semantics. Nevertheless, users can relax the
constraint to use
at-least-once mode to achieve it. Note that records may be sent to downstream
jobs ahead of the committing
