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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2016/03/01 07:54:18 UTC

[jira] [Created] (HBASE-15366) Add doc, trace-level logging, and test around hfileblock

stack created HBASE-15366:
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             Summary: Add doc, trace-level logging, and test around hfileblock
                 Key: HBASE-15366
                 URL: https://issues.apache.org/jira/browse/HBASE-15366
             Project: HBase
          Issue Type: Sub-task
          Components: BlockCache
            Reporter: stack
            Assignee: stack


What hfileblock is doing -- that it overreads when pulling in from hdfs to fetch the header of the next block to save on seeks; that it caches the block and overread and then adds an extra 13 bytes to the cached entry; that buckets in bucketcache have at least four hfileblocks in them and so on -- was totally baffling me. This patch docs the class, adds some trace-level logging so you can see if you are doing the right thing, and then adds a test of file-backed bucketcache that checks that persistence is working.



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