[FLINK-20315][doc] Optimize the compaction document to warn users abo…

…ut backpressure This closes apache#14285
derekm · Dec 2, 2020 · 14b72d5 · 14b72d5
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diff --git a/docs/dev/table/connectors/filesystem.md b/docs/dev/table/connectors/filesystem.md
@@ -186,6 +186,7 @@ If enabled, file compaction will merge multiple small files into larger files ba
 When running file compaction in production, please be aware that:
 - Only files in a single checkpoint are compacted, that is, at least the same number of files as the number of checkpoints is generated.
 - The file before merging is invisible, so the visibility of the file may be: checkpoint interval + compaction time.
+- If the compaction takes too long, it will backpressure the job and extend the time period of checkpoint.
 
 ### Partition Commit
 

diff --git a/docs/dev/table/connectors/filesystem.zh.md b/docs/dev/table/connectors/filesystem.zh.md
@@ -186,6 +186,7 @@ If enabled, file compaction will merge multiple small files into larger files ba
 When running file compaction in production, please be aware that:
 - Only files in a single checkpoint are compacted, that is, at least the same number of files as the number of checkpoints is generated.
 - The file before merging is invisible, so the visibility of the file may be: checkpoint interval + compaction time.
+- If the compaction takes too long, it will backpressure the job and extend the time period of checkpoint.
 
 ### Partition Commit