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https://issues.apache.org/jira/browse/YARN-5621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15472814#comment-15472814
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Varun Vasudev commented on YARN-5621:
-------------------------------------
1)
{code}
+ File srcFile =
+ writeScriptToNMPrivateDir(nmPrivateDir, scriptBuilder.toString());
+ String dstFile =
+ container.getWorkDir() + Path.SEPARATOR + srcFile.getName();
{code}
Rename srcFile to privateScriptFile and dstFile to userScriptFile
2)
{code}
+ } catch (IOException e) {
+ LOG.error("Error when creating symlink for " +
container.getContainerId()
+ + ": " + src + " -> " + symlink, e);
+ }
{code}
We should continue the exception or at least surface that the resource
localization has failed?
3)
{code}
+ LOG.info("Copy " + srcFile + " to " + dstFile);
{code}
Debug instead of info? We already log successful symlink creation in
ContainerImpl.java
4)
{code}
+ } catch (PrivilegedOperationException e) {
+ int exitCode = e.getExitCode();
+ LOG.error("Error when running script [" + dstFile + "], exitcode = "
+ + exitCode + ", output: " + e.getOutput(), e);
+ }
{code}
Like (2) above, we should surface the error to the AM somehow?
5)
{code}
- if (dst.isAbsolute()) {
- throw new IOException("Destination must be relative");
- }
{code}
Can you explain why we need to remove this check? Can’t we just pass the
absolute path of linkFile?
6)
{code}
+ // give up root privs
+ if (change_user(user_detail->pw_uid, user_detail->pw_gid) != 0) {
+ unlink(src_script_file);
+ return -1;
+ }
+
{code}
Instead of -1 we should return an error code saying the change user failed.
7)
{code}
+ unlink(src_script_file);
+ unlink(dst_script_file);
+ return 0;
{code}
This code will never be executed - excel doesn’t return unless there’s an error
- you’ll need to use fork/exec or clean up in the NodeManager itself
> Support LinuxContainerExecutor to create symlinks
> -------------------------------------------------
>
> Key: YARN-5621
> URL: https://issues.apache.org/jira/browse/YARN-5621
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Jian He
> Assignee: Jian He
> Attachments: YARN-5621.1.patch, YARN-5621.2.patch
>
>
> When new resources are localized, new symlink needs to be created for the
> localized resource. This is the change for the LinuxContainerExecutor to
> create the symlinks.
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