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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