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From "Giovanni Matteo Fumarola (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-13970) CacheManager Directives Map
Date Mon, 03 Dec 2018 21:14:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-13970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Giovanni Matteo Fumarola updated HDFS-13970:
--------------------------------------------
    Status: Open  (was: Patch Available)

> CacheManager Directives Map
> ---------------------------
>
>                 Key: HDFS-13970
>                 URL: https://issues.apache.org/jira/browse/HDFS-13970
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: caching, hdfs
>    Affects Versions: 3.2.0
>            Reporter: BELUGA BEHR
>            Assignee: BELUGA BEHR
>            Priority: Minor
>         Attachments: HDFS-13970.1.patch, HDFS-13970.2.patch
>
>
> # Use Guava Multimap to simplify code
>  ## Currently, code uses a mix of LinkedList and ArrayList - just pick one
>  ## Currently, {{directivesByPath}} structure is sorted but never used in a sorted way,
it only performs remove and add operations, no iteration - use a {{Set}} instead of a {{List}}
for values to support faster remove operation.  Use a {{HashSet}} instead of a {{TreeSet}}
for keys since it doesn't appear that order really matters.
>  # The {{CacheDirective}} class needs a better hashcode implementation since it will
be used in a Set.  Do not instantiate a {{HashBuilder}} object every time {{hashcode}} is
called. Ouch.



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