phet commented on code in PR #3965:
URL: https://github.com/apache/gobblin/pull/3965#discussion_r1635637283
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gobblin-metastore/src/test/java/org/apache/gobblin/metastore/testing/TestMetastoreDatabaseServer.java:
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@@ -77,6 +79,7 @@ class TestMetastoreDatabaseServer implements Closeable {
private final String dbUserPassword;
private final String dbHost;
private final int dbPort;
+ private static Map<String, Injector> injectors = new HashMap<>();
Review Comment:
I don't understand who's using this. is it basically a per-JDBC-URI mapping
that caches the `Injector`, so it's not created multiple times?
if so, should this method either be synchronized or we use
`ConcurrentHashMap`?
also, naming could be clearer, such as `injectorsByJdbcUri`
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