[jira] [Created] (HBASE-18156) Provide a tool to show cache summary

["Allan Yang (JIRA)" <ji...@apache.org>]

Allan Yang created HBASE-18156:
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             Summary: Provide a tool to show 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


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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