CDAP-17583 Use instance id for app name and store in-memory offset under the appname key.

Author: sagarkapare

mysql-delta-plugins/src/main/java/io/cdap/delta/mysql/MySqlConstantOffsetBackingStore.java

@@ -42,11 +42,9 @@ public class MySqlConstantOffsetBackingStore extends MemoryOffsetBackingStore {
   static final String ROW = "row";
   static final String EVENT = "event";
   static final String GTID_SET = "gtids";
+  static final String REPLICATION_CONNECTOR_NAME = "replication.connector.name";
 
   private static final Gson GSON = new Gson();
-  // The key is hardcoded here
-  private static final ByteBuffer KEY =
-    StandardCharsets.UTF_8.encode("{\"schema\":null,\"payload\":[\"delta\",{\"server\":\"dummy\"}]}");
 
   @Override
   public void configure(WorkerConfig config) {
@@ -57,7 +55,12 @@ public void configure(WorkerConfig config) {
     String rowStr = originalConfig.get(ROW);
     String eventStr = originalConfig.get(EVENT);
     String gtidSetStr = originalConfig.get(GTID_SET);
+    String replicationConnectorName = originalConfig.get(REPLICATION_CONNECTOR_NAME);
 
+    ByteBuffer key =
+      StandardCharsets.UTF_8.encode("{\"schema\":null,\"payload\":[\""
+                                      + replicationConnectorName
+                                      + "\",{\"server\":\"dummy\"}]}");
     Map<String, Object> offset = new HashMap<>();
     if (!Strings.isNullOrEmpty(fileStr)) {
       offset.put(FILE, fileStr);
@@ -82,6 +85,6 @@ public void configure(WorkerConfig config) {
       return;
     }
 
-    data.put(KEY, StandardCharsets.UTF_8.encode(GSON.toJson(offset)));
+    data.put(key, StandardCharsets.UTF_8.encode(GSON.toJson(offset)));
   }
 }

mysql-delta-plugins/src/main/java/io/cdap/delta/mysql/MySqlEventReader.java

@@ -49,7 +49,6 @@
 import java.time.temporal.Temporal;
 import java.util.Map;
 import java.util.Set;
-import java.util.UUID;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
@@ -99,6 +98,7 @@ public void start(Offset offset) {
       Collectors.toMap(t -> config.getDatabase() + "." + t.getTable(), t -> t));
     Map<String, String> state = offset.get(); // state map is always not null
     String isSnapshot = state.getOrDefault(MySqlConstantOffsetBackingStore.SNAPSHOT, "");
+    String replicationConnectorName = "delta" + context.getInstanceId();
     Configuration.Builder configBuilder = Configuration.create()
       .with("connector.class", MySqlConnector.class.getName())
       .with("offset.storage", MySqlConstantOffsetBackingStore.class.getName())
@@ -111,7 +111,7 @@ public void start(Offset offset) {
       .with("event", state.getOrDefault(MySqlConstantOffsetBackingStore.EVENT, ""))
       .with("gtids", state.getOrDefault(MySqlConstantOffsetBackingStore.GTID_SET, ""))
       /* begin connector properties */
-      .with("name", "delta" + UUID.randomUUID().toString().replace("-", ""))
+      .with("name", replicationConnectorName)
       .with("database.hostname", config.getHost())
       .with("database.port", config.getPort())
       .with("database.user", config.getUser())
@@ -121,7 +121,8 @@ public void start(Offset offset) {
       .with("database.server.name", "dummy") // this is the kafka topic for hosted debezium - it doesn't matter
       .with("database.serverTimezone", config.getServerTimezone())
       .with("table.whitelist", String.join(",", sourceTableMap.keySet()))
-      .with("snapshot.mode", config.getReplicateExistingData() ? "initial" : "schema_only");
+      .with("snapshot.mode", config.getReplicateExistingData() ? "initial" : "schema_only")
+      .with(MySqlConstantOffsetBackingStore.REPLICATION_CONNECTOR_NAME, replicationConnectorName);;
 
     if (config.getConsumerID() != null) {
       // If not provided debezium will randomly pick integer between 5400 and 6400.

sqlserver-delta-plugins/src/main/java/io/cdap/delta/sqlserver/SqlServerConstantOffsetBackingStore.java

@@ -33,8 +33,9 @@
  */
 public class SqlServerConstantOffsetBackingStore extends MemoryOffsetBackingStore {
   private static final Gson GSON = new Gson();
-  private static final String KEY = "{\"schema\":null,\"payload\":[\"delta\",{\"server\":\"dummy\"}]}";
+
   static final String SNAPSHOT_COMPLETED = "snapshot_completed";
+  static final String REPLICATION_CONNECTOR_NAME = "replication.connector.name";
 
   @Override
   public void configure(WorkerConfig config) {
@@ -45,7 +46,8 @@ public void configure(WorkerConfig config) {
     String commitStr = originalConfig.get(SourceInfo.COMMIT_LSN_KEY);
     String snapshot = originalConfig.get(SourceInfo.SNAPSHOT_KEY);
     String snapshotCompleted = originalConfig.get(SNAPSHOT_COMPLETED);
-
+    String replicationConnectorName = originalConfig.get(REPLICATION_CONNECTOR_NAME);
+    String key = "{\"schema\":null,\"payload\":[\"" + replicationConnectorName + "\",{\"server\":\"dummy\"}]}";
     Map<String, Object> offset = new HashMap<>();
     if (!changeStr.isEmpty()) {
       offset.put(SourceInfo.CHANGE_LSN_KEY, changeStr);
@@ -67,6 +69,6 @@ public void configure(WorkerConfig config) {
     }
     byte[] offsetBytes = Bytes.toBytes(GSON.toJson(offset));
 
-    data.put(ByteBuffer.wrap(Bytes.toBytes(KEY)), ByteBuffer.wrap(offsetBytes));
+    data.put(ByteBuffer.wrap(Bytes.toBytes(key)), ByteBuffer.wrap(offsetBytes));
   }
 }

sqlserver-delta-plugins/src/main/java/io/cdap/delta/sqlserver/SqlServerEventReader.java

@@ -43,7 +43,6 @@
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
-import java.util.UUID;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
@@ -107,6 +106,7 @@ public void start(Offset offset) {
     Map<String, String> state = offset.get(); // this will never be null
     // offset config
     String isSnapshotCompleted = state.getOrDefault(SqlServerConstantOffsetBackingStore.SNAPSHOT_COMPLETED, "");
+    String replicationConnectorName = "delta" + context.getInstanceId();
     Configuration.Builder configBuilder = Configuration.create()
       .with("connector.class", SqlServerConnector.class.getName())
       .with("offset.storage", SqlServerConstantOffsetBackingStore.class.getName())
@@ -117,7 +117,7 @@ public void start(Offset offset) {
       .with("snapshot", state.getOrDefault(SourceInfo.SNAPSHOT_KEY, ""))
       .with("snapshot_completed", isSnapshotCompleted)
       /* begin connector properties */
-      .with("name", "delta" + UUID.randomUUID().toString().replace("-", ""))
+      .with("name", replicationConnectorName)
       .with("database.hostname", config.getHost())
       .with("database.port", config.getPort())
       .with("database.user", config.getUser())
@@ -127,7 +127,8 @@ public void start(Offset offset) {
       .with("table.whitelist", String.join(",", sourceTableMap.keySet()))
       .with("database.server.name", "dummy") // this is the kafka topic for hosted debezium - it doesn't matter
       .with("database.serverTimezone", config.getServerTimezone())
-      .with("snapshot.mode", config.getReplicateExistingData() ? "initial" : "schema_only");
+      .with("snapshot.mode", config.getReplicateExistingData() ? "initial" : "schema_only")
+      .with(SqlServerConstantOffsetBackingStore.REPLICATION_CONNECTOR_NAME, replicationConnectorName);
 
     LOG.info("Overriding sql server connector configs with arguments {}", debeziumConnectorConfigs);
     for (Map.Entry<String, String> entry: debeziumConnectorConfigs.entrySet()) {