ruanhang1993 commented on code in PR #3388:
URL: https://github.com/apache/flink-cdc/pull/3388#discussion_r1666356399
##########
flink-cdc-connect/flink-cdc-source-connectors/flink-cdc-base/src/main/java/org/apache/flink/cdc/connectors/base/relational/connection/JdbcConnectionPools.java:
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@@ -83,4 +84,14 @@ public String getJdbcUrl(
}
return jdbcConnectionPoolFactory.getJdbcUrl(sourceConfig);
}
+
+ public static void close() throws IOException {
+ synchronized (instance.pools) {
Review Comment:
Is it possible that the object `instance` is null? If so, there will be an
NullPointerException. If not , we do not need the following judgement `if
(instance != null) `.
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