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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4563) [metrics] scope caching not adjusted for multiple reporters
Date Fri, 28 Oct 2016 13:54:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15615476#comment-15615476
] 

ASF GitHub Bot commented on FLINK-4563:
---------------------------------------

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

    https://github.com/apache/flink/pull/2650#discussion_r85533501
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/metrics/groups/AbstractMetricGroup.java
---
    @@ -169,19 +176,7 @@ public String getMetricIdentifier(String metricName) {
     	 * @return fully qualified metric name
     	 */
     	public String getMetricIdentifier(String metricName, CharacterFilter filter) {
    -		if (scopeString == null) {
    -			if (filter != null) {
    -				scopeString = ScopeFormat.concat(filter, registry.getDelimiter(), scopeComponents);
    -			} else {
    -				scopeString = ScopeFormat.concat(registry.getDelimiter(), scopeComponents);
    -			}
    -		}
    -
    -		if (filter != null) {
    -			return scopeString + registry.getDelimiter() + filter.filterCharacters(metricName);
    -		} else {
    -			return scopeString + registry.getDelimiter() + metricName;
    -		}
    +		return getMetricIdentifier(metricName, filter, -1);
    --- End diff --
    
    If you call `getMetricIdentifier(...)` the reporter index will be passed to `MetricRegistry#getDelimiter()`.
For a negative index this function logs a warning, assuming that some error has occurred that
caused the index to be negative. Since you pass `-1` as the reporter index you will thus always
trigger a warning.


> [metrics] scope caching not adjusted for multiple reporters
> -----------------------------------------------------------
>
>                 Key: FLINK-4563
>                 URL: https://issues.apache.org/jira/browse/FLINK-4563
>             Project: Flink
>          Issue Type: Bug
>          Components: Metrics
>    Affects Versions: 1.1.0
>            Reporter: Chesnay Schepler
>            Assignee: Anton Mushin
>
> Every metric group contains a scope string, representing what entities (job/task/etc.)
a given metric belongs to, which is calculated on demand. 
> Before this string is cached a CharacterFilter is applied to it, which is provided by
the callee, usually a reporter. This was done since different reporters have different requirements
in regards to valid characters. The filtered string is cached so that we don't have to refilter
the string every time.
> This all works fine with a single reporter; with multiple however it is completely broken
as only the first filter is ever applied.



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