mneethiraj commented on code in PR #986:
URL: https://github.com/apache/ranger/pull/986#discussion_r3377054142


##########
audit-server/audit-dispatcher/dispatcher-opensearch/src/main/java/org/apache/ranger/audit/dispatcher/kafka/AuditOpenSearchDispatcher.java:
##########
@@ -0,0 +1,253 @@
+/*
+ * 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.ranger.audit.dispatcher.kafka;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.http.HttpHost;
+import org.apache.http.HttpStatus;
+import org.apache.http.auth.AuthSchemeProvider;
+import org.apache.http.auth.AuthScope;
+import org.apache.http.auth.UsernamePasswordCredentials;
+import org.apache.http.client.CredentialsProvider;
+import org.apache.http.client.config.AuthSchemes;
+import org.apache.http.config.Lookup;
+import org.apache.http.config.RegistryBuilder;
+import org.apache.http.impl.auth.SPNegoSchemeFactory;
+import org.apache.http.entity.ContentType;
+import org.apache.http.impl.client.BasicCredentialsProvider;
+import org.apache.http.nio.entity.NStringEntity;
+import org.apache.http.util.EntityUtils;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.OffsetAndMetadata;
+import org.apache.kafka.common.TopicPartition;
+import org.apache.ranger.audit.dispatcher.AuditEventOpenSearchDocMapper;
+import org.apache.ranger.audit.model.AuthzAuditEvent;
+import org.apache.ranger.audit.provider.MiscUtil;
+import org.apache.ranger.audit.server.AuditServerConstants;
+import org.apache.ranger.audit.utils.AuditServerLogFormatter;
+import org.apache.ranger.authorization.credutils.CredentialsProviderUtil;
+import 
org.apache.ranger.authorization.credutils.kerberos.KerberosCredentialsProvider;
+import org.elasticsearch.client.Request;
+import org.elasticsearch.client.Response;
+import org.elasticsearch.client.RestClient;
+import org.elasticsearch.client.RestClientBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.nio.charset.StandardCharsets;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+public class AuditOpenSearchDispatcher extends AuditDispatcherBase {
+    private static final Logger LOG = 
LoggerFactory.getLogger(AuditOpenSearchDispatcher.class);
+    private static final String DEFAULT_GROUP = 
"ranger_audit_opensearch_dispatcher_group";
+    private static final String DEFAULT_INDEX = "ranger_audits";
+    private static final long   RETRY_SLEEP_MS = 5000L;
+    private static final int    DEFAULT_PORT   = 9200;
+    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
+    private static final TypeReference<Map<String, Object>> MAP_TYPE = new 
TypeReference<Map<String, Object>>() { };
+
+    private RestClient openSearchClient;
+    private String     openSearchIndex;
+
+    public AuditOpenSearchDispatcher(final Properties props, final String 
propPrefix) throws Exception {
+        super(props, propPrefix, DEFAULT_GROUP);
+        init(props, propPrefix);
+    }
+
+    @Override
+    protected final String getDispatcherName() {
+        return "OPENSEARCH";
+    }
+
+    @Override
+    protected final DispatcherWorker createDispatcherWorker(final String 
workerId, final List<Integer> assignedPartitions) {
+        return new OpenSearchDispatcherWorker(workerId, assignedPartitions);
+    }
+
+    @Override
+    protected final void shutdownDestination() {
+        if (openSearchClient != null) {
+            try {
+                openSearchClient.close();
+            } catch (Exception e) {
+                LOG.error("Error shutting down OpenSearch REST client", e);
+            }
+        }
+    }
+
+    private void init(final Properties props, final String propPrefix) throws 
Exception {
+        LOG.info("==> AuditOpenSearchDispatcher.init()");
+
+        String pfx = propPrefix + ".";
+
+        this.openSearchIndex = MiscUtil.getStringProperty(props, pfx + 
"index", DEFAULT_INDEX);
+        this.openSearchClient = createOpenSearchClient(props, pfx);
+
+        this.dispatcherThreadCount = MiscUtil.getIntProperty(props, pfx + 
AuditServerConstants.PROP_DISPATCHER_THREAD_COUNT, 1);
+        this.offsetCommitStrategy = MiscUtil.getStringProperty(props, pfx + 
AuditServerConstants.PROP_DISPATCHER_OFFSET_COMMIT_STRATEGY, 
AuditServerConstants.DEFAULT_OFFSET_COMMIT_STRATEGY);
+        this.offsetCommitInterval = MiscUtil.getLongProperty(props, pfx + 
AuditServerConstants.PROP_DISPATCHER_OFFSET_COMMIT_INTERVAL, 
AuditServerConstants.DEFAULT_OFFSET_COMMIT_INTERVAL_MS);
+
+        AuditServerLogFormatter.builder("AuditOpenSearchDispatcher 
Configuration")
+            .add("Index", openSearchIndex)
+            .add("Thread Count", dispatcherThreadCount)
+            .add("Commit Strategy", offsetCommitStrategy)
+            .add("Commit Interval (ms)", offsetCommitInterval + " (manual mode 
only)")
+            .logInfo(LOG);
+
+        LOG.info("<== AuditOpenSearchDispatcher.init()");
+    }
+
+    public final void processMessageBatch(final Collection<String> audits) 
throws Exception {

Review Comment:
   `processMessageBatch()` called only from this class; consider marking as 
`private`.



##########
audit-server/audit-dispatcher/dispatcher-opensearch/src/main/java/org/apache/ranger/audit/dispatcher/kafka/AuditOpenSearchDispatcher.java:
##########
@@ -0,0 +1,253 @@
+/*
+ * 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.ranger.audit.dispatcher.kafka;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.http.HttpHost;
+import org.apache.http.HttpStatus;
+import org.apache.http.auth.AuthSchemeProvider;
+import org.apache.http.auth.AuthScope;
+import org.apache.http.auth.UsernamePasswordCredentials;
+import org.apache.http.client.CredentialsProvider;
+import org.apache.http.client.config.AuthSchemes;
+import org.apache.http.config.Lookup;
+import org.apache.http.config.RegistryBuilder;
+import org.apache.http.impl.auth.SPNegoSchemeFactory;
+import org.apache.http.entity.ContentType;
+import org.apache.http.impl.client.BasicCredentialsProvider;
+import org.apache.http.nio.entity.NStringEntity;
+import org.apache.http.util.EntityUtils;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.OffsetAndMetadata;
+import org.apache.kafka.common.TopicPartition;
+import org.apache.ranger.audit.dispatcher.AuditEventOpenSearchDocMapper;
+import org.apache.ranger.audit.model.AuthzAuditEvent;
+import org.apache.ranger.audit.provider.MiscUtil;
+import org.apache.ranger.audit.server.AuditServerConstants;
+import org.apache.ranger.audit.utils.AuditServerLogFormatter;
+import org.apache.ranger.authorization.credutils.CredentialsProviderUtil;
+import 
org.apache.ranger.authorization.credutils.kerberos.KerberosCredentialsProvider;
+import org.elasticsearch.client.Request;
+import org.elasticsearch.client.Response;
+import org.elasticsearch.client.RestClient;
+import org.elasticsearch.client.RestClientBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.nio.charset.StandardCharsets;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+public class AuditOpenSearchDispatcher extends AuditDispatcherBase {
+    private static final Logger LOG = 
LoggerFactory.getLogger(AuditOpenSearchDispatcher.class);
+    private static final String DEFAULT_GROUP = 
"ranger_audit_opensearch_dispatcher_group";
+    private static final String DEFAULT_INDEX = "ranger_audits";
+    private static final long   RETRY_SLEEP_MS = 5000L;
+    private static final int    DEFAULT_PORT   = 9200;
+    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
+    private static final TypeReference<Map<String, Object>> MAP_TYPE = new 
TypeReference<Map<String, Object>>() { };
+
+    private RestClient openSearchClient;
+    private String     openSearchIndex;
+
+    public AuditOpenSearchDispatcher(final Properties props, final String 
propPrefix) throws Exception {
+        super(props, propPrefix, DEFAULT_GROUP);
+        init(props, propPrefix);
+    }
+
+    @Override
+    protected final String getDispatcherName() {
+        return "OPENSEARCH";
+    }
+
+    @Override
+    protected final DispatcherWorker createDispatcherWorker(final String 
workerId, final List<Integer> assignedPartitions) {
+        return new OpenSearchDispatcherWorker(workerId, assignedPartitions);
+    }
+
+    @Override
+    protected final void shutdownDestination() {
+        if (openSearchClient != null) {
+            try {
+                openSearchClient.close();
+            } catch (Exception e) {
+                LOG.error("Error shutting down OpenSearch REST client", e);
+            }
+        }
+    }
+
+    private void init(final Properties props, final String propPrefix) throws 
Exception {

Review Comment:
   To be consistent with rest of the code base, please keep `private` methods 
after all `public` and `protected` methods. Please make sure to browse through 
a short list of coding guidelines at 
https://cwiki.apache.org/confluence/display/RANGER/Coding+guidelines.



##########
audit-server/audit-dispatcher/dispatcher-opensearch/src/main/java/org/apache/ranger/audit/dispatcher/OpenSearchDispatcherManager.java:
##########
@@ -0,0 +1,208 @@
+/*
+ * 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.ranger.audit.dispatcher;
+
+import org.apache.ranger.audit.dispatcher.kafka.AuditDispatcher;
+import org.apache.ranger.audit.dispatcher.kafka.AuditDispatcherTracker;
+import org.apache.ranger.audit.dispatcher.kafka.AuditOpenSearchDispatcher;
+import org.apache.ranger.audit.provider.MiscUtil;
+import org.apache.ranger.audit.server.AuditServerConstants;
+import org.apache.ranger.audit.utils.AuditServerLogFormatter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Properties;
+
+public final class OpenSearchDispatcherManager {
+    private static final Logger LOG = 
LoggerFactory.getLogger(OpenSearchDispatcherManager.class);
+    private static final String CONFIG_DISPATCHER_TYPE = 
AuditServerConstants.PROP_DISPATCHER_TYPE;
+    private static final String TYPE_OPENSEARCH = "opensearch";
+    private static final String ES_DEST_PROP = 
"xasecure.audit.destination.elasticsearch";

Review Comment:
   Why is it necessary to use existing configuration for Elasticsearch - 
`xasecure.audit.destination.elasticsearch`? I suggest using 
`xasecure.audit.destination.opensearch` - unless there are any issues.



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