[ 
https://issues.apache.org/jira/browse/HIVE-27186?focusedWorklogId=858726&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-858726
 ]

ASF GitHub Bot logged work on HIVE-27186:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 24/Apr/23 14:45
            Start Date: 24/Apr/23 14:45
    Worklog Time Spent: 10m 
      Work Description: henrib commented on code in PR #4194:
URL: https://github.com/apache/hive/pull/4194#discussion_r1175396173


##########
standalone-metastore/metastore-server/src/test/java/org/apache/hadoop/hive/metastore/properties/HMSPropertyStoreRemoteTest.java:
##########
@@ -0,0 +1,233 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hive.metastore.properties;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.jexl3.JxltEngine;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hive.metastore.HMSHandler;
+import org.apache.hadoop.hive.metastore.HiveMetaStore;
+import org.apache.hadoop.hive.metastore.HiveMetaStoreClient;
+import org.apache.hadoop.hive.metastore.JdoPropertyStore;
+import org.apache.hadoop.hive.metastore.MetaStoreTestUtils;
+import org.apache.hadoop.hive.metastore.ObjectStore;
+import org.apache.hadoop.hive.metastore.TestObjectStore;
+import org.apache.hadoop.hive.metastore.Warehouse;
+import org.apache.hadoop.hive.metastore.api.InvalidInputException;
+import org.apache.hadoop.hive.metastore.api.InvalidObjectException;
+import org.apache.hadoop.hive.metastore.api.InvalidOperationException;
+import org.apache.hadoop.hive.metastore.api.MaintenanceOpStatus;
+import org.apache.hadoop.hive.metastore.api.MaintenanceOpType;
+import org.apache.hadoop.hive.metastore.api.MetaException;
+import org.apache.hadoop.hive.metastore.client.builder.DatabaseBuilder;
+import org.apache.hadoop.hive.metastore.conf.MetastoreConf;
+import org.apache.hadoop.hive.metastore.security.HadoopThriftAuthBridge;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.StringWriter;
+import java.util.Map;
+import java.util.TreeMap;
+
+import static 
org.apache.hadoop.hive.metastore.properties.HMSPropertyManager.JEXL;
+import static 
org.apache.hadoop.hive.metastore.properties.HMSPropertyManager.MAINTENANCE_OPERATION;
+import static 
org.apache.hadoop.hive.metastore.properties.HMSPropertyManager.MAINTENANCE_STATUS;
+import static org.apache.hadoop.hive.metastore.properties.PropertyType.BOOLEAN;
+import static 
org.apache.hadoop.hive.metastore.properties.PropertyType.DATETIME;
+import static org.apache.hadoop.hive.metastore.properties.PropertyType.DOUBLE;
+import static org.apache.hadoop.hive.metastore.properties.PropertyType.INTEGER;
+import static org.apache.hadoop.hive.metastore.properties.PropertyType.JSON;
+import static org.apache.hadoop.hive.metastore.properties.PropertyType.STRING;
+
+public class HMSPropertyStoreRemoteTest extends HMSPropertyStoreTest {
+  //private static final String NS = "hms";
+  protected HiveMetaStoreClient client;
+  private boolean isServerStarted = false;
+  protected int port;
+
+  boolean createStore(Configuration conf, Warehouse wh) {
+    try {
+      MetaStoreTestUtils.setConfForStandloneMode(conf);
+      objectStore = new ObjectStore();
+      objectStore.setConf(conf);
+      //TestObjectStore.dropAllStoreObjects(objectStore);
+      HMSHandler.createDefaultCatalog(objectStore, wh);
+      // configure object store
+      objectStore.createDatabase(new DatabaseBuilder()
+          .setCatalogName("hive")
+          .setName(DB1)
+          .setDescription("description")
+          .setLocation("locationurl")
+          .build(conf));
+    } catch(InvalidObjectException | MetaException | InvalidOperationException 
xmeta) {
+      throw new PropertyException("unable to initialize server", xmeta);
+    }
+    return true;
+  }
+
+  @Before
+  public void setUp() throws Exception {
+    conf = MetastoreConf.newMetastoreConf();
+    MetastoreConf.setBoolVar(conf, MetastoreConf.ConfVars.HIVE_IN_TEST, true);
+    // Events that get cleaned happen in batches of 1 to exercise batching code
+    MetastoreConf.setLongVar(conf, 
MetastoreConf.ConfVars.EVENT_CLEAN_MAX_EVENTS, 1L);
+    MetaStoreTestUtils.setConfForStandloneMode(conf);
+    if (isServerStarted) {
+      Assert.assertNotNull("Unable to connect to the MetaStore server", 
client);
+      return;
+    }
+    port = 
MetaStoreTestUtils.startMetaStoreWithRetry(HadoopThriftAuthBridge.getBridge(), 
conf);
+    System.out.println("Starting MetaStore Server on port " + port);
+    isServerStarted = true;
+
+    Warehouse wh = new Warehouse(conf);
+    boolean inited = createStore(conf, wh);
+    LOG.info("MetaStore Thrift Server test initialization " + (inited? 
"successful":"failed"));
+    // This is default case with setugi off for both client and server
+    client = createClient();
+  }
+
+
+  protected HiveMetaStoreClient createClient() throws Exception {
+    MetastoreConf.setVar(conf, MetastoreConf.ConfVars.THRIFT_URIS, 
"thrift://localhost:" + port);
+    MetastoreConf.setBoolVar(conf, MetastoreConf.ConfVars.EXECUTE_SET_UGI, 
false);
+    HiveMetaStoreClient client = new HiveMetaStoreClient(conf);
+    return client;
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    MetaStoreTestUtils.close(port);
+    super.tearDown();
+  }
+
+  @Test
+  public void testHMSProperties() throws Exception {

Review Comment:
   Refactored the unit tests (and added a Servlet skeleton to test another 
transport).





Issue Time Tracking
-------------------

    Worklog Id:     (was: 858726)
    Time Spent: 11h 40m  (was: 11.5h)

> A persistent property store 
> ----------------------------
>
>                 Key: HIVE-27186
>                 URL: https://issues.apache.org/jira/browse/HIVE-27186
>             Project: Hive
>          Issue Type: Improvement
>          Components: Metastore
>    Affects Versions: 4.0.0-alpha-2
>            Reporter: Henri Biestro
>            Assignee: Henri Biestro
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 11h 40m
>  Remaining Estimate: 0h
>
> WHAT
> A persistent property store usable as a support facility for any metadata 
> augmentation feature.
> WHY
> When adding new meta-data oriented features, we usually need to persist 
> information linking the feature data and the HiveMetaStore objects it applies 
> to. Any information related to a database, a table or the cluster - like 
> statistics for example or any operational data state or data (think rolling 
> backup) -  fall in this use-case.
> Typically, accommodating such a feature requires modifying the Metastore 
> database schema by adding or altering a table. It also usually implies 
> modifying the thrift APIs to expose such meta-data to consumers.
> The proposed feature wants to solve the persistence and query/transport for 
> these types of use-cases by exposing a 'key/(meta)value' store exposed as a 
> property system.
> HOW
> A property-value model is the simple and generic exposed API.
> To provision for several usage scenarios, the model entry point is a 
> 'namespace' that qualifies the feature-component property manager. For 
> example, 'stats' could be the namespace for all properties related to the 
> 'statistics' feature.
> The namespace identifies a manager that handles property-groups persisted as 
> property-maps. For instance, all statistics pertaining to a given table would 
> be collocated in the same property-group. As such, all properties (say number 
> of 'unique_values' per columns) for a given HMS table 'relation0' would all 
> be stored and persisted in the same property-map instance.
> Property-maps may be decorated by an (optional) schema that may declare the 
> name and value-type of allowed properties (and their optional default value). 
> Each property is addressed by a name, a path uniquely identifying the 
> property in a given property map.
> The manager also handles transforming property-map names to the property-map 
> keys used to persist them in the DB.
> The API provides inserting/updating properties in bulk transactionally. It 
> also provides selection/projection to help reduce the volume of exchange 
> between client/server; selection can use (JEXL expression) predicates to 
> filter maps.



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