[jira] [Created] (HADOOP-17266) Sudo in hadoop-functions.sh should preserve environment variables

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[jira] [Created] (HADOOP-17266) Sudo in hadoop-functions.sh should preserve environment variables

Sergey Smolyakov (Jira)
Chengbing Liu created HADOOP-17266:
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             Summary: Sudo in hadoop-functions.sh should preserve environment variables
                 Key: HADOOP-17266
                 URL: https://issues.apache.org/jira/browse/HADOOP-17266
             Project: Hadoop Common
          Issue Type: Bug
          Components: scripts
    Affects Versions: 3.3.0
            Reporter: Chengbing Liu


Steps to reproduce:
1. Set {{HDFS_NAMENODE_USER=hdfs}} in {{/etc/default/hadoop-hdfs-namenode}} to enable user check (and switch to {{hdfs}} to start/stop NameNode daemon)
2. Stop NameNode with: {{service hadoop-hdfs-namenode stop}}
3. Got an error and NameNode is not stopped
{{
ERROR: Cannot execute /usr/lib/hadoop-hdfs/bin/../libexec/hdfs-config.sh.
Failed to stop Hadoop namenode. Return value: 1. [FAILED]}}

The root cause is that after sudo, {{HADOOP_HOME=/usr/lib/hadoop}} is not preserved, and {{/usr/lib/hadoop-hdfs/bin/hdfs}} locates libexec by the following logic:

{{
# let's locate libexec...
if [[ -n "${HADOOP_HOME}" ]]; then
  HADOOP_DEFAULT_LIBEXEC_DIR="${HADOOP_HOME}/libexec"
else
  bin=$(cd -P -- "$(dirname -- "${MYNAME}")" >/dev/null && pwd -P)
  HADOOP_DEFAULT_LIBEXEC_DIR="${bin}/../libexec"
fi}}

I believe the key point here is that we should preserve environment variables when doing sudo.

Note that this bug is not introduced by HDFS-15353, before which {{su -l}} is used, which will also discard environment variables.



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