You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@hbase.apache.org by "Ted Yu (Commented) (JIRA)" <ji...@apache.org> on 2011/10/11 06:28:29 UTC
[jira] [Commented] (HBASE-4569) Simpler implementation for slab
cache
[ https://issues.apache.org/jira/browse/HBASE-4569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13124675#comment-13124675 ]
Ted Yu commented on HBASE-4569:
-------------------------------
Overall, the logic is simpler.
Tests in TestSlabCache should be enabled.
In SlabCache.cacheBlock(), slabEntry.getKey() at line 216 can be removed.
I ran TestSlabCache several times and they passed.
Please upload to review board after fixing testHeapSizeChanges
Nice work Todd.
> Simpler implementation for slab cache
> -------------------------------------
>
> Key: HBASE-4569
> URL: https://issues.apache.org/jira/browse/HBASE-4569
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Attachments: hbase-4569.txt
>
>
> I spent a little bit of time last night hacking on the slab cache implementation to make it a little simpler. The change is:
> - no longer has the composition of SlabCache containing a SingleSizeCache per slab size. SlabCache holds its own slabs
> - no longer use guava's map implementations to handle a size-bounded cache. Instead, manages its own LRU linked list
> - significantly less clever about synchronization. since this is an L2 cache, it should be less contended than the L1 cache, and I think we can afford to be dumb.
> - should have less memory usage since there's only one map entry per key instead of several.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira