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

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

    [ https://issues.apache.org/jira/browse/HBASE-27796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17713732#comment-17713732 ] 

Hudson commented on HBASE-27796:
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Results for branch master
	[build #820 on builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/820/]: (/) *{color:green}+1 overall{color}*
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details (if available):

(/) {color:green}+1 general checks{color}
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(/) {color:green}+1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3) report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/820/JDK8_20Nightly_20Build_20Report_20_28Hadoop3_29/]


(/) {color:green}+1 jdk11 hadoop3 checks{color}
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(/) {color:green}+1 source release artifact{color}
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(/) {color:green}+1 client integration test{color}


> 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
>
>
> 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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