tencent cloud

Background

Alluxio provides a unified namespace mechanism that allows other file systems to be mounted to the file system of Alluxio. In addition, it allows upper-layer applications to use the unified namespace to access data scattered across different systems.

Mounting COS

Sample: Mounting a COS bucket to an Alluxio directory

bin/alluxio fs mount --option fs.cos.access.key=<COS_SECRET_ID> \
  --option fs.cos.secret.key=<COS_SECRET_KEY> \
  --option fs.cos.region=<COS_REGION> \
  --option fs.cos.app.id=<COS_APP_ID> \
  /cos cos://<COS_BUCKET>/

Configure the COS information in each --option.

This command mounts the COS directory specified by cos://bucket/xxx to the /cos directory in Alluxio.

Mounting HDFS

Sample: Mounting an HDFS directory to an Alluxio directory

`bin/alluxio fs mount /hdfs hdfs://data` 

This command mounts the /data directory of HDFS to the /hdfs subdirectory of Alluxio.
After the mount is successful, the mounted content can be viewed by running the alluxio fs ls command.

Mounting CHDFS

Sample: Mounting CHDFS to Alluxio through mount

Note：

This is supported only for EMR 2.5.0 or later + Alluxio 2.3.0 or later.

alluxio fs mount   \ 
--option alluxio.underfs.hdfs.configuration=/usr/local/service/hadoop/etc/hadoop/core-site.xml  \
/chdfs ofs://f4modr7kmvw-wMqw.chdfs.ap-chongqing.myqcloud.com