[jira] [Commented] (HADOOP-15066) Spurious error stopping secure datanode

["Arpit Agarwal (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-15066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16263168#comment-16263168 ] 

Arpit Agarwal commented on HADOOP-15066:
----------------------------------------

The error is from {{hadoop_stop_daemon}} in _hadoop-functions.sh_.

{code}
    pid=$(cat "$pidfile")

    kill "${pid}" >/dev/null 2>&1
...
      cur_pid=$(cat "$pidfile")
...
      if [[ "${pid}" = "${cur_pid}" ]]; then
        rm -f "${pidfile}" >/dev/null 2>&1
      else
        hadoop_error "WARNING: pid has changed for ${cmd}, skip deleting pid file"
{code}

It looks like jsvc auto-deletes the pid file when the process is killed with SIGTERM. The check for changed pid likely needs to be skipped if the pid file doesn't exist.

> Spurious error stopping secure datanode
> ---------------------------------------
>
>                 Key: HADOOP-15066
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15066
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 3.0.0
>            Reporter: Arpit Agarwal
>
> Looks like there is a spurious error when stopping a secure datanode.
> {code}
> # hdfs --daemon stop datanode
> cat: /var/run/hadoop/hdfs//hadoop-hdfs-root-datanode.pid: No such file or directory
> WARNING: pid has changed for datanode, skip deleting pid file
> cat: /var/run/hadoop/hdfs//hadoop-hdfs-root-datanode.pid: No such file or directory
> WARNING: daemon pid has changed for datanode, skip deleting daemon pid file
> {code}



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