[GitHub] [incubator-iotdb] samperson1997 opened a new pull request #486: [IOTDB-271] Add configuration for HDFS HA

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samperson1997 opened a new pull request #486: [IOTDB-271] Add configuration for HDFS HA
URL: https://github.com/apache/incubator-iotdb/pull/486
 
 
   Add configuration for HDFS HA. If there are more than one `hdfs_ip` in configuration, Hadoop HA is used.  Example: 
   ```
   # TSFile storage file system. Currently, Tsfile are supported to be stored in LOCAL file system or HDFS.
   tsfile_storage_fs=LOCAL
   
   # If using HDFS, hadoop ip can be configured. If there are more than one hdfs_ip, Hadoop HA is used
   hdfs_ip=localhost
   
   # If using HDFS, hadoop port can be configured
   hdfs_port=9000
   
   # If there are more than one hdfs_ip, Hadoop HA is used. Below are configuration for HA
   # If using Hadoop HA, nameservices of hdfs can be configured
   dfs_nameservices=hdfsnamespace
   
   # If using Hadoop HA, namenodes under dfs nameservices can be configured
   dfs_ha_namenodes=nn1,nn2
   
   # If using Hadoop HA, automatic failover can be enabled or disabled
   dfs_ha_automatic_failover_enabled=true
   
   # If using Hadoop HA and enabling automatic failover, the proxy provider can be configured
   dfs_client_failover_proxy_provider=org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider
   ```

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