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https://issues.apache.org/jira/browse/YARN-8498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16738433#comment-16738433
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Ayush Saxena commented on YARN-8498:
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Thanx [~jlowe] for giving a look.
{quote}That's going to cause problems if a system ever decides to not typedef
pid_t to __pid_t, and systems are completely free to make that choice in the
future. Same goes for __WAIT_STATUS.
{quote}
That is what something happened for __WAIT_STATUS .
As of now _pid_t still seems to be present in GCC 7.But we definitely can't be
sure regarding its future too.Moreover I guess using these macros is not
helping us too in no way.
I have changed __pid_t to pid_t too in v2 as a preventive measure.
If someone wants to give a check that __pid_t is same as pid_t , can check
[here|https://github.com/trailofbits/abigen/blob/master/data/platforms/ubuntu/18.04.1/usr/include/sys/types.h#L98]
> Yarn NodeManager OOM Listener Fails Compilation on Ubuntu 18.04
> ---------------------------------------------------------------
>
> Key: YARN-8498
> URL: https://issues.apache.org/jira/browse/YARN-8498
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Jack Bearden
> Assignee: Ayush Saxena
> Priority: Blocker
> Attachments: YARN-8498-02.patch, YARN-8948-01.patch
>
>
> While building this project, I ran into a few compilation errors here. The
> first one was in this file:
> hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/oom-listener/impl/oom_listener_main.c
> At the very end, during the compilation of the OOM test, it fails again:
>
> hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/oom-listener/test/oom_listener_test_main.cc
> hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/oom-listener/test/oom_listener_test_main.cc:256:7:
> error: ‘__WAIT_STATUS’ was not declared in this scope
> __WAIT_STATUS mem_hog_status = {};
> hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/oom-listener/test/oom_listener_test_main.cc:257:30:
> error: ‘mem_hog_status’ was not declared in this scope
> __pid_t exited0 = wait(mem_hog_status);
> hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/oom-listener/test/oom_listener_test_main.cc:275:21:
> error: expected ‘;’ before ‘oom_listener_status’
> __WAIT_STATUS oom_listener_status = {};
> hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/oom-listener/test/oom_listener_test_main.cc:276:30:
> error: ‘oom_listener_status’ was not declared in this scope
> __pid_t exited1 = wait(oom_listener_status);
>
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