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From "ChiaPing Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-12393) The regionserver web will throw exception if we disable block cache
Date Wed, 14 Jan 2015 08:54:37 GMT

     [ https://issues.apache.org/jira/browse/HBASE-12393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ChiaPing Tsai updated HBASE-12393:
----------------------------------
    Attachment:     (was: HBASE-12393-v2.patch)

> The regionserver web will throw exception if we disable block cache
> -------------------------------------------------------------------
>
>                 Key: HBASE-12393
>                 URL: https://issues.apache.org/jira/browse/HBASE-12393
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver, UI
>    Affects Versions: 0.98.7
>         Environment: ubuntu 12.04 64bits, hadoop-2.2.0, hbase-0.98.7-hadoop2
>            Reporter: ChiaPing Tsai
>            Assignee: ChiaPing Tsai
>            Priority: Minor
>             Fix For: 1.0.0, 2.0.0, 0.98.10, 1.1.0
>
>         Attachments: HBASE-12393.patch
>
>
> The CacheConfig.getBlockCache() will return the null point when we set hfile.block.cache.size
to zero.
> The BlockCacheTmpl.jamon doesn't make a check on null blockcache.
> {code}
> <%if cacheConfig == null %>
> <p>CacheConfig is null</p>
> <%else>
> <table class="table table-striped">
>     <tr>
>         <th>Attribute</th>
>         <th>Value</th>
>         <th>Description</th>
>     </tr>
>     <tr>
>         <td>Size</td>
>         <td><% StringUtils.humanReadableInt(cacheConfig.getBlockCache().size())
%></td>
>         <td>Total size of Block Cache (bytes)</td>
>     </tr>
>     <tr>
>         <td>Free</td>
>         <td><% StringUtils.humanReadableInt(cacheConfig.getBlockCache().getFreeSize())
%></td>
>         <td>Free space in Block Cache (bytes)</td>
>     </tr>
>     <tr>
>         <td>Count</td>
>         <td><% String.format("%,d", cacheConfig.getBlockCache().getBlockCount())
%></td>
>         <td>Number of blocks in Block Cache</td>
>     </tr>
>     <tr>
>         <td>Evicted</td>
>         <td><% String.format("%,d", cacheConfig.getBlockCache().getStats().getEvictedCount())
%></td>
>         <td>Number of blocks evicted</td>
>     </tr>
>     <tr>
>         <td>Evictions</td>
>         <td><% String.format("%,d", cacheConfig.getBlockCache().getStats().getEvictionCount())
%></td>
>         <td>Number of times an eviction occurred</td>
>     </tr>
>     <tr>
>         <td>Hits</td>
>         <td><% String.format("%,d", cacheConfig.getBlockCache().getStats().getHitCount())
%></td>
>         <td>Number requests that were cache hits</td>
>     </tr>
>     <tr>
>         <td>Hits Caching</td>
>         <td><% String.format("%,d", cacheConfig.getBlockCache().getStats().getHitCachingCount())
%></td>
>         <td>Cache hit block requests but only requests set to use Block Cache</td>
>     </tr>
>     <tr>
>         <td>Misses</td>
>         <td><% String.format("%,d", cacheConfig.getBlockCache().getStats().getMissCount())
%></td>
>         <td>Number of requests that were cache misses</td>
>     </tr>
>     <tr>
>         <td>Misses Caching</td>
>         <td><% String.format("%,d", cacheConfig.getBlockCache().getStats().getMissCount())
%></td>
>         <td>Block requests that were cache misses but only requests set to use
Block Cache</td>
>     </tr>
>     <tr>
>         <td>Hit Ratio</td>
>         <td><% String.format("%,.2f", cacheConfig.getBlockCache().getStats().getHitRatio()
* 100) %><% "%" %></td>
>         <td>Hit Count divided by total requests count</td>
>     </tr>
> {code}



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