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https://issues.apache.org/jira/browse/HADOOP-17266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17197490#comment-17197490
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Akira Ajisaka commented on HADOOP-17266:
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Umm... The directory structure in Apache Hadoop releases should be as follows:
{noformat}
${HADOOP_HOME}/
├── bin/
│ └── hdfs
└── libexec/
└── hdfs-config.sh{noformat}
and that's why bin/../libexec/hdfs-config.sh should exist.
> Sudo in hadoop-functions.sh should preserve environment variables
> ------------------------------------------------------------------
>
> Key: HADOOP-17266
> URL: https://issues.apache.org/jira/browse/HADOOP-17266
> Project: Hadoop Common
> Issue Type: Bug
> Components: scripts
> Affects Versions: 3.3.0
> Reporter: Chengbing Liu
> Priority: Major
> Attachments: HADOOP-17266.001.patch
>
>
> Steps to reproduce:
> 1. Set {{HDFS_NAMENODE_USER=hdfs}} in {{/etc/default/hadoop-hdfs-namenode}}
> to enable user check (and switch to {{hdfs}} to start/stop NameNode daemon)
> 2. Stop NameNode with: {{service hadoop-hdfs-namenode stop}}
> 3. Got an error and NameNode is not stopped
> {noformat}
> ERROR: Cannot execute /usr/lib/hadoop-hdfs/bin/../libexec/hdfs-config.sh.
> Failed to stop Hadoop namenode. Return value: 1. [FAILED]
> {noformat}
> The root cause is that after sudo, {{HADOOP_HOME=/usr/lib/hadoop}} is not
> preserved, and {{/usr/lib/hadoop-hdfs/bin/hdfs}} locates libexec by the
> following logic:
> {noformat}
> # let's locate libexec...
> if [[ -n "${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
> {noformat}
> 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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