hadoop: add umask doc (#465)

docs/en/hadoop_java_sdk.md

@@ -95,6 +95,7 @@ Then put the JAR file and `$JAVA_HOME/lib/tools.jar` to the classpath of each Ha
 | `juicefs.superuser`       | `hdfs`        | The super user                                                                                                                                                          |
 | `juicefs.users`           | `null`        | The path of username and UID list file, e.g. `jfs://name/etc/users`. The file format is `<username>:<UID>`, one user per line.                                              |
 | `juicefs.groups`          | `null`        | The path of group name, GID and group members list file, e.g. `jfs://name/etc/groups`. The file format is `<group-name>:<GID>:<username1>,<username2>`, one group per line. |
+| `juicefs.umask`          | `null`  | like 022，default value from fs.permissions.umask-mode |
 | `juicefs.push-gateway`    |               | [Prometheus Pushgateway](https://github.com/prometheus/pushgateway) address, format is `<host>:<port>`.                                                                 |
 | `juicefs.push-interval`   | 10            | Prometheus push interval in seconds                                                                                                                                     |
 | `juicefs.push-auth`       |               | [Prometheus basic auth](https://prometheus.io/docs/guides/basic-auth) information, format is `<username>:<password>`.                                                   |

docs/zh_cn/hadoop_java_sdk.md

@@ -95,6 +95,7 @@ $ make
 | `juicefs.superuser`       | `hdfs`  | 超级用户                                                                                                                                  |
 | `juicefs.users`           | `null`  | 用户名以及 UID 列表文件的地址，比如 `jfs://name/etc/users`。文件格式为 `<username>:<UID>`，一行一个用户。                                     |
 | `juicefs.groups`          | `null`  | 用户组、GID 以及组成员列表文件的地址，比如 `jfs://name/etc/groups`。文件格式为 `<group-name>:<GID>:<username1>,<username2>`，一行一个用户组。 |
+| `juicefs.umask`          | `null`  | 格式为 022，如果没有此配置，默认值是 fs.permissions.umask-mode |
 | `juicefs.push-gateway`    |         | [Prometheus Pushgateway](https://github.com/prometheus/pushgateway) 地址，格式为 `<host>:<port>`。                                        |
 | `juicefs.push-interval`   | 10      | 推送数据到 Prometheus 的时间间隔，单位为秒。                                                                                              |
 | `juicefs.push-auth`       |         | [Prometheus 基本认证](https://prometheus.io/docs/guides/basic-auth)信息，格式为 `<username>:<password>`。                                 |