Zhankun Tang created YARN-9083:
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Summary: Support remote directory localization in yarn native
service
Key: YARN-9083
URL: https://issues.apache.org/jira/browse/YARN-9083
Project: Hadoop YARN
Issue Type: Improvement
Reporter: Zhankun Tang
Assignee: Zhankun Tang
When refining YARN-8714, found that the YARN localizer seems can handle remote
directory directly. In FSDownload.java#downloadAndUnpack, it uses
"FileUtil.copy" which can handle directory. This ability is added by YARN-2185.
For testing purpose, I changed distributedShell's client to let it localize an
HDFS directory "mydir" directly.
{code:java}
Path p = new Path("hdfs:///user/yarn/submarine/jobs/tf-job-001/staging" +
"/mydir");
FileStatus scFileStatus = fs.getFileStatus(p);
LocalResource r =
LocalResource.newInstance(URL.fromURI(p.toUri()),
LocalResourceType.FILE, LocalResourceVisibility.APPLICATION,
scFileStatus.getLen(), scFileStatus.getModificationTime());
localResources.put("mydir", r);{code}
And YARN localizer indeed downloads the HDFS dir to local for DistributedShell.
{code:java}
yarn@master0-VirtualBox:~/apache-hadoop-install-dir/hadoop-dev-workspace$ ls
/tmp/hadoop-yarn/nm-local-dir/usercache/yarn/appcache/application_1543898305524_0004/filecache/13/mydir
1.py 2.py dir1 test_kill9.sh
yarn@master0-VirtualBox:~/apache-hadoop-install-dir/hadoop-dev-workspace$ ls
/tmp/hadoop-yarn/nm-local-dir/usercache/yarn/appcache/application_1543898305524_0004/container_1543898305524_0004_01_000001/
-l
total 20
lrwxrwxrwx 1 yarn hadoop 111 12月 5 10:08 AppMaster.jar ->
/tmp/hadoop-yarn/nm-local-dir/usercache/yarn/appcache/application_1543898305524_0004/filecache/10/AppMaster.jar
lrwxrwxrwx 1 yarn hadoop 103 12月 5 10:08 mydir ->
/tmp/hadoop-yarn/nm-local-dir/usercache/yarn/appcache/application_1543898305524_0004/filecache/13/mydir
{code}
But the YARN native service seems doesn't know this YARN localizer ability and
blocked it.
{code:java}
2018-12-05 10:06:40,286 ERROR client.ApiServiceClient:
srcFile=hdfs://192.168.50.191:9000/user/yarn/submarine/jobs/tf-job-001/staging/mydir
is a directory, which is not supported.{code}
We should utilize this ability in yarn native service.
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