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https://issues.apache.org/jira/browse/HBASE-18156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16036816#comment-16036816
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Allan Yang commented on HBASE-18156:
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The failed test passed locally
> Provide a tool to show block cache summary
> ------------------------------------------
>
> Key: HBASE-18156
> URL: https://issues.apache.org/jira/browse/HBASE-18156
> Project: HBase
> Issue Type: New Feature
> Affects Versions: 2.0.0, 1.4.0
> Reporter: Allan Yang
> Assignee: Allan Yang
> Attachments: HBASE-18156.patch, HBASE-18156.v2.patch
>
>
> HBASE-17757 is already committed. But since there is no easy way to show the
> size distribution of cached blocks, it is hard to decide the unified size
> should be used.
> Here I provide a tool to show the details of size distribution of cached
> blocks. This tool is well used in our production environment. It is a jsp
> page summaries the cache details like this
> {code}
> BlockCache type:org.apache.hadoop.hbase.io.hfile.LruBlockCache
> LruBlockCache
> Total size:28.40 GB
> Current size:22.49 GB
> MetaBlock size:1.56 GB
> Free size:5.91 GB
> Block count:152684
> Size distribution summary:
> BlockCacheSizeDistributionSummary [0 B<=blocksize<4 KB, blocks=833,
> heapSize=1.19 MB]
> BlockCacheSizeDistributionSummary [4 KB<=blocksize<8 KB, blocks=65,
> heapSize=310.83 KB]
> BlockCacheSizeDistributionSummary [8 KB<=blocksize<12 KB, blocks=175,
> heapSize=1.46 MB]
> BlockCacheSizeDistributionSummary [12 KB<=blocksize<16 KB, blocks=18,
> heapSize=267.43 KB]
> BlockCacheSizeDistributionSummary [16 KB<=blocksize<20 KB, blocks=512,
> heapSize=8.30 MB]
> BlockCacheSizeDistributionSummary [20 KB<=blocksize<24 KB, blocks=22,
> heapSize=499.66 KB]
> BlockCacheSizeDistributionSummary [24 KB<=blocksize<28 KB, blocks=24,
> heapSize=632.59 KB]
> BlockCacheSizeDistributionSummary [28 KB<=blocksize<32 KB, blocks=34,
> heapSize=1.02 MB]
> BlockCacheSizeDistributionSummary [32 KB<=blocksize<36 KB, blocks=31,
> heapSize=1.02 MB]
> BlockCacheSizeDistributionSummary [36 KB<=blocksize<40 KB, blocks=22,
> heapSize=838.58 KB]
> BlockCacheSizeDistributionSummary [40 KB<=blocksize<44 KB, blocks=28,
> heapSize=1.15 MB]
> {code}
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