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From "ChiaPing Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12393) The regionserver web will throw exception if we disable block cache
Date Mon, 12 Jan 2015 09:10:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14273419#comment-14273419
] 

ChiaPing Tsai commented on HBASE-12393:
---------------------------------------

{quote}
-1 tests included. The patch doesn't appear to include any new or modified tests.
Please justify why no new tests are needed for this patch.
Also please list what manual steps were performed to verify this patch.
{quote}

Not added any UT as it was only message change on Web UI.
The manual steps are shown below:
#set hfile.block.cache.size to zero.
#open the HRegionServer Web and there are no nullpointexception anymore.
#click on "Stats of Block Cache" and "CacheConfig is null" will appear

> 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
>            Priority: Minor
>         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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