deniskuzZ commented on code in PR #5003:
URL: https://github.com/apache/hive/pull/5003#discussion_r1466525719
##########
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/DatabaseProduct.java:
##########
@@ -776,4 +782,21 @@ public Configuration getConf() {
public void setConf(Configuration c) {
myConf = c;
}
+
+ /**
+ * lockInternal() and {@link #unlockInternal()} are used to serialize those
operations that require
+ * Select ... For Update to sequence operations properly. In practice that
means when running
+ * with Derby database. See more notes at class level.
+ */
+ public void lockInternal() {
+ if(isDERBY()) {
+ derbyLock.lock();
+ }
+ }
+
+ public void unlockInternal() {
+ if(isDERBY()) {
Review Comment:
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