[jira] [Created] (HBASE-14556) Make prefetchOnOpen configurable for index and/or data blocks

["Lars George (JIRA)" <ji...@apache.org>]

Lars George created HBASE-14556:
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             Summary: Make prefetchOnOpen configurable for index and/or data blocks
                 Key: HBASE-14556
                 URL: https://issues.apache.org/jira/browse/HBASE-14556
             Project: HBase
          Issue Type: Bug
          Components: BlockCache, regionserver
            Reporter: Lars George


This came up in user discussions. It would be great to add an extra option to the {{CacheConfig}} that allows to specify what blocks are cached during region/file opening. This should allows to set {{BlockIndexOnly}}, {{BloomFilterOnly}}, {{AllIndexesOnly}}, {{DataOnly}}, and {{AllBlocks}}. 

For large datasets it is not viable to load all blocks into memory, but to speed up access it still makes sense to prefetch the index blocks (being block index and Bloom filter blocks).



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