dmvk commented on issue #9759: [FLINK-14169][history-server] Cleanup expired 
jobs from history server
URL: https://github.com/apache/flink/pull/9759#issuecomment-542579134
 
 
   @aljoscha Thanks for the review! The original motivation was 
[FLINK-13958](https://issues.apache.org/jira/browse/FLINK-13958). As we are 
forced to run jobs in detached mode, we need to somehow determine that the 
batch job has completed successfully. We do this by polling the history server.
   
   History server became unresponsive with large number of jobs (1000+) and in 
case of restart it took a really long time to recover as it needed to replay 
the whole history from hdfs. We only need to keep recent jobs in history server 
and the expected behavior would be, that the history server "mirrors" the 
actual state of watched directories.
   
   WDYT?
   
   Thanks,
   D.

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