some improvement for doc

Author: luoyuxia

website/docs/maintenance/filesystems/hdfs.md

@@ -40,7 +40,12 @@ You can see the configuration keys in Hadoop's [`core-site.xml`](https://hadoop.
 
 #### Hadoop Environment Configuration
 
-To use the machine hadoop environment, instead of Fluss' embedded Hadoop, follow these steps:
+Fluss includes bundled Hadoop libraries with version 3.3.4 for deploying Fluss in machine without Hadoop installed. 
+For most use cases, these work perfectly. However, you should configure your machine's native Hadoop environment if:
+1. Your HDFS uses kerberos security
+2. You need to avoid version conflicts between Fluss's bundled hadoop libraries and your HDFS cluster
+
+Configuration Steps are following:
 
 **Step 1: Set Hadoop Classpath**
 ```bash

website/docs/maintenance/tiered-storage/lakehouse-storage.md

@@ -52,27 +52,29 @@ datalake.paimon.warehouse: /tmp/paimon_data_warehouse
 
 Fluss processes Paimon configurations by removing the `datalake.paimon.` prefix and then use the remaining configuration (without the prefix `datalake.paimon.`) to create the Paimon catalog. Checkout the [Paimon documentation](https://paimon.apache.org/docs/1.1/maintenance/configurations/) for more details on the available configurations.
 
-For example, to configure the use of a Hive catalog, you need to [download](https://nightlies.apache.org/flink/flink-docs-stable/docs/connectors/table/hive/overview/#using-bundled-hive-jar) the Flink SQL Hive Client JAR, place the downloaded JAR in Paimon's plugin directory at $FLUSS_HOME/plugins/paimon, and then add the following configuration:
+For example, if you want to configure to use Hive catalog, you can configure like following:
 ```yaml
 datalake.format: paimon
 datalake.paimon.metastore: hive
 datalake.paimon.uri: thrift://<hive-metastore-host-name>:<port>
 datalake.paimon.warehouse: hdfs:///path/to/warehouse
 ```
+
 #### Add other jars required by datalake
 While Fluss includes the core Paimon library, additional jars may still need to be manually added to `${FLUSS_HOME}/plugins/paimon/` according to your needs.
-For example, for OSS filesystem support, you need to put `paimon-oss-<paimon_version>.jar` into directory `${FLUSS_HOME}/plugins/paimon/`.
-
-#### Hadoop Environment Configuration
+For example:
+- If you are using Paimon filesystem catalog with OSS filesystem, you need to put `paimon-oss-<paimon_version>.jar` into directory `${FLUSS_HOME}/plugins/paimon/`.
+- If you are using Hive catalog, you need to put [the flink sql hive connector jar](https://nightlies.apache.org/flink/flink-docs-stable/docs/connectors/table/hive/overview/#using-bundled-hive-jar) into directory `${FLUSS_HOME}/plugins/paimon/`.
 
-To use the machine hadoop environment, instead of Fluss' embedded Hadoop, follow these steps:
+#### Hadoop Environment Configuration(required for kerberos-secured HDFS)
+Other usage scenarios can skip this section.
 
 **Step 1: Set Hadoop Classpath**
 ```bash
 export HADOOP_CLASSPATH=`hadoop classpath`
 ```
 
-**Step 2: Add the following to your configuration file**
+**Step 2: Add the following to your `server.yaml` file**
 ```yaml
 plugin.classloader.parent-first-patterns.default: java.,com.alibaba.fluss.,javax.annotation.,org.slf4j,org.apache.log4j,org.apache.logging,org.apache.commons.logging,ch.qos.logback,hdfs-site,core-site,org.apache.hadoop.,META-INF
 ```