abstractdog commented on code in PR #4566:
URL: https://github.com/apache/hive/pull/4566#discussion_r1398834938


##########
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/TxnHandler.java:
##########
@@ -112,104 +51,135 @@
 import org.apache.hadoop.hive.metastore.api.HeartbeatTxnRangeRequest;
 import org.apache.hadoop.hive.metastore.api.HeartbeatTxnRangeResponse;
 import org.apache.hadoop.hive.metastore.api.HiveObjectType;
-import org.apache.hadoop.hive.metastore.api.LockComponent;
 import org.apache.hadoop.hive.metastore.api.LockRequest;
 import org.apache.hadoop.hive.metastore.api.LockResponse;
-import org.apache.hadoop.hive.metastore.api.LockState;
-import org.apache.hadoop.hive.metastore.api.LockType;
 import org.apache.hadoop.hive.metastore.api.Materialization;
 import org.apache.hadoop.hive.metastore.api.MaxAllocatedTableWriteIdRequest;
 import org.apache.hadoop.hive.metastore.api.MaxAllocatedTableWriteIdResponse;
 import org.apache.hadoop.hive.metastore.api.MetaException;
+import org.apache.hadoop.hive.metastore.api.NoSuchCompactionException;
 import org.apache.hadoop.hive.metastore.api.NoSuchLockException;
 import org.apache.hadoop.hive.metastore.api.NoSuchTxnException;
 import org.apache.hadoop.hive.metastore.api.OpenTxnRequest;
 import org.apache.hadoop.hive.metastore.api.OpenTxnsResponse;
 import org.apache.hadoop.hive.metastore.api.Partition;
-import org.apache.hadoop.hive.metastore.api.ReplLastIdInfo;
 import org.apache.hadoop.hive.metastore.api.ReplTblWriteIdStateRequest;
 import org.apache.hadoop.hive.metastore.api.SeedTableWriteIdsRequest;
 import org.apache.hadoop.hive.metastore.api.SeedTxnIdRequest;
 import org.apache.hadoop.hive.metastore.api.ShowCompactRequest;
 import org.apache.hadoop.hive.metastore.api.ShowCompactResponse;
-import org.apache.hadoop.hive.metastore.api.ShowCompactResponseElement;
 import org.apache.hadoop.hive.metastore.api.ShowLocksRequest;
 import org.apache.hadoop.hive.metastore.api.ShowLocksResponse;
-import org.apache.hadoop.hive.metastore.api.ShowLocksResponseElement;
 import org.apache.hadoop.hive.metastore.api.Table;
-import org.apache.hadoop.hive.metastore.api.TableValidWriteIds;
 import org.apache.hadoop.hive.metastore.api.TxnAbortedException;
 import org.apache.hadoop.hive.metastore.api.TxnOpenException;
-import org.apache.hadoop.hive.metastore.api.TxnToWriteId;
 import org.apache.hadoop.hive.metastore.api.TxnType;
 import org.apache.hadoop.hive.metastore.api.UnlockRequest;
 import org.apache.hadoop.hive.metastore.api.UpdateTransactionalStatsRequest;
-import org.apache.hadoop.hive.metastore.api.WriteEventInfo;
 import org.apache.hadoop.hive.metastore.conf.MetastoreConf;
 import org.apache.hadoop.hive.metastore.conf.MetastoreConf.ConfVars;
 import org.apache.hadoop.hive.metastore.datasource.DataSourceProvider;
 import org.apache.hadoop.hive.metastore.datasource.DataSourceProviderFactory;
 import org.apache.hadoop.hive.metastore.events.AbortTxnEvent;
-import org.apache.hadoop.hive.metastore.events.AllocWriteIdEvent;
-import org.apache.hadoop.hive.metastore.events.CommitTxnEvent;
-import org.apache.hadoop.hive.metastore.events.ListenerEvent;
-import org.apache.hadoop.hive.metastore.events.OpenTxnEvent;
 import org.apache.hadoop.hive.metastore.events.AcidWriteEvent;
+import org.apache.hadoop.hive.metastore.events.ListenerEvent;
 import org.apache.hadoop.hive.metastore.messaging.EventMessage;
 import org.apache.hadoop.hive.metastore.metrics.Metrics;
 import org.apache.hadoop.hive.metastore.metrics.MetricsConstants;
 import org.apache.hadoop.hive.metastore.tools.SQLGenerator;
-import org.apache.hadoop.hive.metastore.txn.impl.InsertCompactionInfoCommand;
-import org.apache.hadoop.hive.metastore.txn.jdbc.TransactionContext;
-import 
org.apache.hadoop.hive.metastore.txn.retryhandling.SqlRetryCallProperties;
+import org.apache.hadoop.hive.metastore.txn.entities.LockInfo;
+import org.apache.hadoop.hive.metastore.txn.impl.HiveMutex;
+import 
org.apache.hadoop.hive.metastore.txn.impl.commands.AddWriteIdsToMinHistoryCommand;

Review Comment:
   in general we're against wildcard imports, but this time it's a typical 
usecase to avoid mass import and have a clean representation of the new class 
hierarchy:
   ```
   import org.apache.hadoop.hive.metastore.txn.impl.commands.*;
   import org.apache.hadoop.hive.metastore.txn.impl.functions.*;
   import org.apache.hadoop.hive.metastore.txn.impl.queries.*;
   ```



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