Vrushali C commented on YARN-6905:

So the ApplicationId.toString is being invoked in AppIdKeyConverter#decode 
function which is in the hadoop-yarn-server-timelineservice-hbase module. This 
module depends on hadoop-yarn-api as well as hadoop-common. So I think moving 
the FastNumberFormat from hadoop-common to  hadoop-yarn-api  may not help. 

I think timeline service would need to override the ApplicationId.toString 
internally. Or, although I think this won't be very likable, hadoop-yarn-api 
can provide a ApplicationId#toStringSlowImpl function (or some such named 
function) in ApplicationId itself which keeps the old code instead of the 
changes to ApplicationId #toString() in YARN-6768.

Unfortunately, we could see more classpath conflicts as trunk keeps evolving, 
till timeline service on trunk can be based on the hbase version which is based 
on hadoop trunk. 

> Multiple test failures due to FastNumberFormat
> ----------------------------------------------
>                 Key: YARN-6905
>                 URL: https://issues.apache.org/jira/browse/YARN-6905
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: 3.0.0-beta1
>         Environment: Ubuntu 14.04 
> x86, ppc64le
> $ java -version
> openjdk version "1.8.0_111"
> OpenJDK Runtime Environment (build 1.8.0_111-8u111-b14-3~14.04.1-b14)
> OpenJDK 64-Bit Server VM (build 25.111-b14, mixed mode)
>            Reporter: Sonia Garudi
>            Assignee: Haibo Chen
> There are multiple test failing in Hadoop YARN Timeline Service HBase tests 
> project with the following error :
> {code}
> java.lang.NoClassDefFoundError: org/apache/hadoop/util/FastNumberFormat
>         at 
> org.apache.hadoop.yarn.api.records.ApplicationId.toString(ApplicationId.java:104)
> {code}
> Below are the failing tests :
> {code}
>   TestHBaseTimelineStorageApps.testWriteApplicationToHBase
>   TestHBaseTimelineStorageApps.testEvents
>   TestHBaseTimelineStorageEntities.testEventsEscapeTs
>   TestHBaseTimelineStorageEntities.testWriteEntityToHBase
>   TestHBaseTimelineStorageEntities.testEventsWithEmptyInfo
> {code}

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