[jira] [Assigned] (HADOOP-18185) tune logging of prefetch problems

["Aaron Fabbri (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-18185?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aaron Fabbri reassigned HADOOP-18185:
-------------------------------------

    Assignee: Aaron Fabbri

> tune logging of prefetch problems
> ---------------------------------
>
>                 Key: HADOOP-18185
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18185
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.4.0
>            Reporter: Steve Loughran
>            Assignee: Aaron Fabbri
>            Priority: Major
>
> we need to think what we want to do here.
> * we would want errors to be counted and included in stream iostats
> * but we've seen abfs apps flooded with stack traces when a transient network error breaks every prefetch.
> * logging through LogExactlyOnce would highlight a problem, but on a long lived process, not show enough, unless the cache manager had a per instance value.
> # PrefetchTask needs to be non static and update the CachingBlockManager when there is a problem; it can LogExactlyOnce
> # stream statistics need to include cache values (hits, misses, prefech failures, how long futures were queued before execution...)



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