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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3349) LruBlockCache is miscalculating sizes
Date Fri, 17 Apr 2015 04:18:59 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499214#comment-14499214
] 

Josh Elser commented on ACCUMULO-3349:
--------------------------------------

Alright, thanks John. I can understand the difficulty in testing this. Please do report back
if you see this again. It would be nice if we could get some better stats on the block cache
to help make this more obvious in the future.

> LruBlockCache is miscalculating sizes
> -------------------------------------
>
>                 Key: ACCUMULO-3349
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3349
>             Project: Accumulo
>          Issue Type: Bug
>    Affects Versions: 1.6.0
>            Reporter: John Vines
>            Assignee: John Vines
>             Fix For: 1.7.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> On a system, we have index configured to 512MB and data block caches set to 1GB. I'm
seeing the total size seemingly horrendously miscalculated, resulting in a LOT of eviction
calls.
> {code}2014-11-17 22:07:54,814 [cache.LruBlockCache] DEBUG: Block cache LRU eviction started.
 Attempting to free 58954734976 bytes
> 2014-11-17 22:07:54,817 [cache.LruBlockCache] DEBUG: Block cache LRU eviction completed.
Freed 102696 bytes.  Priority Sizes: Single=186.14093MB (195182912), Multi=384.03125MB (402685944),Memory=0.0MB
(0)
> 2014-11-17 22:07:54,820 [cache.LruBlockCache] DEBUG: Block cache LRU eviction started.
 Attempting to free 58954734976 bytes
> 2014-11-17 22:07:54,823 [cache.LruBlockCache] DEBUG: Block cache LRU eviction completed.
Freed 102680 bytes.  Priority Sizes: Single=186.14093MB (195182920), Multi=384.03125MB (402685936),Memory=0.0MB
(0)
> 2014-11-17 22:07:54,829 [cache.LruBlockCache] DEBUG: Block cache LRU eviction started.
 Attempting to free 58954734984 bytes
> 2014-11-17 22:07:54,832 [cache.LruBlockCache] DEBUG: Block cache LRU eviction completed.
Freed 205384 bytes.  Priority Sizes: Single=186.043MB (195080224), Multi=384.12918MB (402788640),Memory=0.0MB
(0)
> {code}
> {code}2014-11-17 22:06:39,439 [cache.LruBlockCache] DEBUG: Cache Stats: Sizes: Total=56991.715MB
(59760144624), Free=-55967.715MB (-58686402800), Max=1024.0MB
>  (1073741824), Counts: Blocks=581902, Access=261753272, Hit=202812039, Miss=58941233,
Evictions=45047347, Evicted=53777417, Ratios: Hit Ratio=77.4821341
> 0377502%, Miss Ratio=22.51785844564438%, Evicted/Run=1.1937975883483887, Duplicate Reads=4581914
> 2014-11-17 22:07:39,419 [cache.LruBlockCache] DEBUG: Cache Stats: Sizes: Total=835.4461MB
(876028744), Free=-323.4461MB (-339157832), Max=512.0MB (536870912), Counts: Blocks=19881,
Access=171866619, Hit=171174512, Miss=692107, Evictions=300619, Evicted=595529, Ratios: Hit
Ratio=99.5972990989685%, Miss Ratio=0.402700062841177%, Evicted/Run=1.9810091257095337, Duplicate
Reads=76697
> 2014-11-17 22:07:39,439 [cache.LruBlockCache] DEBUG: Cache Stats: Sizes: Total=56991.418MB
(59759831656), Free=-55967.418MB (-58686089832), Max=1024.0MB (1073741824), Counts: Blocks=581901,
Access=261755962, Hit=202813386, Miss=58942576, Evictions=45048521, Evicted=53778759, Ratios:
Hit Ratio=77.48185992240906%, Miss Ratio=22.518140077590942%, Evicted/Run=1.1937963962554932,
Duplicate Reads=4581916
> 2014-11-17 22:08:39,419 [cache.LruBlockCache] DEBUG: Cache Stats: Sizes: Total=835.1727MB
(875742096), Free=-323.17273MB (-338871184), Max=512.0MB (536870912), Counts: Blocks=19762,
Access=171879228, Hit=171187080, Miss=692148, Evictions=300642, Evicted=595689, Ratios: Hit
Ratio=99.5972990989685%, Miss Ratio=0.40269438177347183%, Evicted/Run=1.9813898801803589,
Duplicate Reads=76697
> {code}
> Currently do not have log history to pinpoint where/where/if there was a slow incline
to get to 55GB or if it was spontaneous at some discernible point.



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