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From "Feng Honghua (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10263) make LruBlockCache single/multi/in-memory ratio user-configurable and provide preemptive mode for in-memory type block
Date Tue, 31 Dec 2013 12:15:50 GMT
Feng Honghua created HBASE-10263:
------------------------------------

             Summary: make LruBlockCache single/multi/in-memory ratio user-configurable and
provide preemptive mode for in-memory type block
                 Key: HBASE-10263
                 URL: https://issues.apache.org/jira/browse/HBASE-10263
             Project: HBase
          Issue Type: Improvement
            Reporter: Feng Honghua
            Assignee: Feng Honghua
         Attachments: HBASE-10263-trunk_v0.patch

currently the single/multi/in-memory ratio in LruBlockCache is hardcoded 1:2:1, which can
lead to somewhat counter-intuition behavior for some user scenario where in-memory table's
read performance is much worse than ordinary table when two tables' data size is almost equal
and larger than regionserver's cache size (we ever did some such experiment and verified that
in-memory table random read performance is two times worse than ordinary table).

this patch fixes above issue and provides:
1. make single/multi/in-memory ratio user-configurable
2. provide a configurable switch which can make in-memory block preemptive, by preemptive
means when this switch is on in-memory block can kick out any ordinary block to make room
until no ordinary block, when this switch is off (by default) the behavior is the same as
previous, using single/multi/in-memory ratio to determine evicting.

by default, above two changes are both off and the behavior keeps the same as before applying
this patch. it's client/user's choice to determine whether or which behavior to use by enabling
one of these two enhancements.



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