HDDS-11947. [Docs] [User Guide] Impala Integration.

Change-Id: Ic09028a519199274093186b611963ebb8bfb7879

hadoop-hdds/docs/content/integration/Impala.md

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+---
+title: Impala
+weight: 4
+menu:
+   main:
+      parent: "Application integrations"
+---
+<!---
+  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.
+-->
+
+Starting with version **4.2.0**, Apache Impala provides full support for
+querying data stored in **Apache Ozone**. To utilize this functionality,
+ensure that your Ozone version is **1.4.0** or later.
+
+## Supported Access Protocols
+
+Impala supports the following protocols for accessing Ozone data:
+
+* ofs
+* s3a
+
+Note: The o3fs protocol is **NOT** supported by Impala.
+
+## Supported Bucket Types
+
+Impala is compatible with Ozone buckets configured with either:
+
+* RATIS (Replication)
+* Erasure Coding
+
+## Querying Ozone Data with Impala
+
+**If Ozone is configured as the default file system**, you can run Impala
+queries seamlessly without modifications, just as if the file system were
+HDFS. For example:
+
+```sql
+  CREATE TABLE t1 (x INT, s STRING);
+```
+
+**If Ozone is not the default file system**, you must specify the Ozone path
+explicitly using the LOCATION clause. For example:
+
+```sql
+  CREATE DATABASE d1 LOCATION 'ofs://ozone1/vol1/bucket1/d1.db';
+```
+
+For additional information, consult the Apache Impala User Documentation
+[Using Impala with Apache Ozone Storage](https://impala.apache.org/docs/build/html/topics/impala_ozone.html).

hadoop-hdds/docs/content/integration/_index.md

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+---
+title: "Application integrations"
+menu:
+   main:
+      weight: 5
+---
+<!---
+  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.
+-->
+
+{{<jumbotron title="Application integration">}}
+Many applications can be integrated with Ozone through the the Hadoop compatible ofs interface or the S3 interface.
+{{</jumbotron>}}