[jira] [Updated] (HBASE-27796) Improve MemcachedBlockCache

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-27796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Kyle Purtell updated HBASE-27796:
----------------------------------------
    Status: Patch Available  (was: Open)

> Improve MemcachedBlockCache
> ---------------------------
>
>                 Key: HBASE-27796
>                 URL: https://issues.apache.org/jira/browse/HBASE-27796
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.5.4
>            Reporter: Andrew Kyle Purtell
>            Assignee: Andrew Kyle Purtell
>            Priority: Major
>             Fix For: 2.6.0, 3.0.0-alpha-4, 2.5.5, 2.4.18
>
>
> MemcachedBlockCache is apparently not used, given the bugs I have found, but provides some useful functionality that we are investigating at $dayjob. Fix it.
>  - Track and log better stats
> - Fix use of memcached API such that we are not accidentally immediately expiring keys.
> - Use a default retention period of 30 days, the max per memcached spec
> - Use set instead of add to store keys
> - Gracefully handle failures to cache and read timeouts
> - Add unit tests using jmemcached as a test dependency



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