hdfsreader 说明文档有个地方可能引起误解

参数说明 -- hadoopConfig 部分，HA 配置的示例

> "hadoopConfig":{
"dfs.nameservices": "testDfs",
"dfs.ha.namenodes.testDfs": "namenode1,namenode2",
       "dfs.namenode.rpc-address.aliDfs.namenode1": "",
"dfs.namenode.rpc-address.aliDfs.namenode2": "",
"dfs.client.failover.proxy.provider.testDfs": "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider"
}

建议改为：

> "defaultFS": "hdfs://testcluster",
"hadoopConfig":{
"dfs.nameservices": "testcluster",
"dfs.ha.namenodes.testcluster": "namenode1,namenode2",
       "dfs.namenode.rpc-address.testcluster.namenode1": "host:port",
"dfs.namenode.rpc-address.testcluster.namenode2": "host:port",
"dfs.client.failover.proxy.provider.testcluster": "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider"
}

No file or test is named; locate the hdfsreader parameter documentation and its hadoopConfig HA example. Compare the nameservice and RPC-address values with the proposed testcluster example, and finish when the documented identifiers and defaultFS are consistent.

Written by the indexing model from the issue text.