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https://issues.apache.org/jira/browse/FLINK-4422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15877999#comment-15877999
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ASF GitHub Bot commented on FLINK-4422:
---------------------------------------

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

    https://github.com/apache/flink/pull/3384#discussion_r102435330
  
    --- Diff: 
flink-clients/src/test/java/org/apache/flink/client/program/ClientConnectionTest.java
 ---
    @@ -115,13 +115,13 @@ public void run() {
     
                        try {
                                // wait until the caller is successful, for at 
most the given time
    -                           long now = System.currentTimeMillis();
    -                           long deadline = now + MAX_DELAY;
    +                           long now = System.nanoTime();
    +                           long deadline = now + MAX_DELAY*1000000;
    --- End diff --
    
    agree, although I commonly use 1000_000 in fact:) I planed to use [this 
detailed idea 
style](https://raw.githubusercontent.com/dawidwys/flink/bee981be8aa83225a8e3a736700eae445d79cece/tools/FlinkCodeStyle.xml)
 after digging today's discussions in mail list. Is this OK?:)


> Convert all time interval measurements to System.nanoTime()
> -----------------------------------------------------------
>
>                 Key: FLINK-4422
>                 URL: https://issues.apache.org/jira/browse/FLINK-4422
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Stephan Ewen
>            Assignee: Jin Mingjian
>            Priority: Minor
>
> In contrast to {{System.currentTimeMillis()}}, {{System.nanoTime()}} is 
> monotonous. To measure delays and time intervals, {{System.nanoTime()}} is 
> hence reliable, while {{System.currentTimeMillis()}} is not.



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