From 9054f6415326006ad9996bd230d7d7215fd7ef45 Mon Sep 17 00:00:00 2001
From: Piotr Findeisen <piotr.findeisen@gmail.com>
Date: Thu, 4 May 2023 11:45:08 +0200
Subject: [PATCH] Document ConnectorSplitSource thread-safety requirements

Note that some existing implementations are not thread-safe. For example
`IcebergSplitSource.scannedFiles` is accessed without any
synchronization.
---
 .../java/io/trino/spi/connector/ConnectorSplitSource.java    | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/trino-spi/src/main/java/io/trino/spi/connector/ConnectorSplitSource.java b/core/trino-spi/src/main/java/io/trino/spi/connector/ConnectorSplitSource.java
index 87a964099cb2..04bbba0cde6b 100644
--- a/core/trino-spi/src/main/java/io/trino/spi/connector/ConnectorSplitSource.java
+++ b/core/trino-spi/src/main/java/io/trino/spi/connector/ConnectorSplitSource.java
@@ -20,6 +20,11 @@
 
 import static java.util.Objects.requireNonNull;
 
+/**
+ * Source of splits to be processed.
+ * <p>
+ * Thread-safety: the implementations are not required to be thread-safe.
+ */
 public interface ConnectorSplitSource
         extends Closeable
 {