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https://issues.apache.org/jira/browse/FLINK-2174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14577119#comment-14577119
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ASF GitHub Bot commented on FLINK-2174:
---------------------------------------

Github user mxm commented on a diff in the pull request:

    https://github.com/apache/flink/pull/796#discussion_r31910178
  
    --- Diff: flink-dist/src/main/flink-bin/bin/config.sh ---
    @@ -220,7 +220,7 @@ 
INTERNAL_HADOOP_CLASSPATHS="$HADOOP_CLASSPATH:$HADOOP_CONF_DIR:$YARN_CONF_DIR"
     # also potentialy includes topology information and the taskManager type
     extractHostName() {
         # extract first part of string (before any whitespace characters)
    -    SLAVE=$1
    +    SLAVE=`echo $1 | cut -d'#' -f 1`
         # Remove types and possible comments
         if [[ "$SLAVE" =~ ^([0-9a-zA-Z/.-]+).*$ ]]; then
                 SLAVE=${BASH_REMATCH[1]}
    --- End diff --
    
    No need to change line 223 because
    ```bash
    if [[ "$SLAVE" =~ ^([0-9a-zA-Z/.-]+).*$ ]]; then
                 SLAVE=${BASH_REMATCH[1]}
    fi
    ``` 
    will already filter out lines starting with `#`.


> Allow comments in 'slaves' file
> -------------------------------
>
>                 Key: FLINK-2174
>                 URL: https://issues.apache.org/jira/browse/FLINK-2174
>             Project: Flink
>          Issue Type: Improvement
>          Components: Start-Stop Scripts
>            Reporter: Matthias J. Sax
>            Assignee: Matthias J. Sax
>            Priority: Trivial
>
> Currently, each line in slaves in interpreded as a host name. Scripts should 
> skip lines starting with '#'. Also allow for comments at the end of a line 
> and skip empty lines.



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