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From "John Vines (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3349) LruBlockCache is miscalculating sizes
Date Tue, 14 Apr 2015 14:48:12 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14494183#comment-14494183
] 

John Vines commented on ACCUMULO-3349:
--------------------------------------

I didn't, I'm not really sure how to test this since it is a concurrency bug. And I was only
able to see this in LONG running systems (at least 6 weeks) so it's not something rapidly
testable.

And TBH, I'm not 100% certain that this is the fix. However, it was tracked down to this via
code audit and even if this code isn't the culprit, the old logic was not correct, so at bare
minimum that is fixed.

> 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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