Mount two same name ns to alluxio can not be support

[maobaolong]

Alluxio Version:
Alluxio-2.0.0-SNAPSHOT, in fact, i build it from master branch at 5/5/2019

Describe the bug

Blank in my mount commandline will be parsed as a parameter

To Reproduce

• /software/servers/alluxio-2.0.0-preview/bin/alluxio mkdir /tmp

• /software/servers/alluxio-2.0.0-preview/bin/alluxio fs mount --readonly --option alluxio.underfs.hdfs.configuration=/software/servers/alluxio-2.0.0-preview/hadoop-conf/cluster1/hadoop/hdfs-site.xml /tmp/app-logs/ hdfs://ns19/tmp/app-logs/

• /software/servers/alluxio-2.0.0-preview/bin/alluxio fs mount --readonly --option alluxio.underfs.hdfs.configuration=/software/servers/alluxio-2.0.0-preview/hadoop-conf/cluster2/hadoop/hdfs-site.xml /tmp/app-logs2/ hdfs://ns19/tmp/app-logs/

Expected behavior

Mount point hdfs://ns19/tmp/app-logs is a prefix of hdfs://ns19/tmp/app-logs

Urgency

urgent

Additional context

if we can support this, we can combine our all hdfs cluster's ns.

[maobaolong]

Hi @yuzhu , is this issue has been fixed? If so, I'd like to have a try.

[yuzhu]

could you describe the issue in a different way maybe? I was not too sure what you meant there. looks like you were trying to mount the same hdfs path twice?

[maobaolong]

@yuzhu Sorry for the confusing description, let me show more detail.

The ns19 in /software/servers/alluxio-2.0.0-preview/hadoop-conf/cluster1/hadoop/hdfs-site.xml means to connect namenode address A, and ns19 in /software/servers/alluxio-2.0.0-preview/hadoop-conf/cluster2/hadoop/hdfs-site.xml stand for namenode address B.

So the following two mount behaviors is different. we should check whether the two ns19 are same.

/software/servers/alluxio-2.0.0-preview/bin/alluxio fs mount --readonly --option alluxio.underfs.hdfs.configuration=/software/servers/alluxio-2.0.0-preview/hadoop-conf/cluster1/hadoop/hdfs-site.xml /tmp/app-logs/ hdfs://ns19/tmp/app-logs/
/software/servers/alluxio-2.0.0-preview/bin/alluxio fs mount --readonly --option alluxio.underfs.hdfs.configuration=/software/servers/alluxio-2.0.0-preview/hadoop-conf/cluster2/hadoop/hdfs-site.xml /tmp/app-logs2/ hdfs://ns19/tmp/app-logs/

[LuQQiu]

@maobaolong is this being addressed? why is it hard to have two different names for the two different hdfs clusters?

[jja725]

seems like this is more of a feature request. Will close it for now, feel free to reopen it and contact us if this is a strong request!