bambrow opened a new pull request, #4361:
URL: https://github.com/apache/hadoop/pull/4361
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### Description of PR
https://issues.apache.org/jira/browse/YARN-11165
When JavaSandboxLinuxContainerRuntime is used, we can specify
yarn.nodemanager.runtime.linux.sandbox-mode.policy to use self-provided
java.policy file. When this setting is not specified,
JavaSandboxLinuxContainerRuntime will use the default java.policy file.
However, when user belongs to a group (or more groups), and
yarn.nodemanager.runtime.linux.sandbox-mode.policy.group.$groupName setting is
not specified, JavaSandboxLinuxContainerRuntime still skips the default
java.policy file, resulting in a final policy which looks like this:
```
grant codeBase "file:/usr/local/hadoop/-" {
permission java.security.AllPermission;
};
grant {
permission java.io.FilePermission
"/tmp/hadoop-yarn/nm-local-dir/usercache/yarn/appcache/application_1653546011283_0006//-",
"read";
permission java.io.FilePermission
"/tmp/hadoop-yarn/nm-local-dir/usercache/yarn/appcache/application_1653546011283_0006/filecache/13/-",
"read";
permission java.io.FilePermission
"/tmp/hadoop-yarn/nm-local-dir/usercache/yarn/appcache/application_1653546011283_0006/filecache/11/-",
"read";
permission java.io.FilePermission
"/tmp/hadoop-yarn/nm-local-dir/usercache/yarn/appcache/application_1653546011283_0006/filecache/12/-",
"read";
permission java.io.FilePermission
"/tmp/hadoop-yarn/nm-local-dir/usercache/yarn/appcache/application_1653546011283_0006/filecache/10/-",
"read";
};
```
which will cause problem running applications.
This PR ensures that the default java.policy will still be used when no
group policy is set.
### How was this patch tested?
### For code changes:
- [ ] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
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