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From "Liyin Tang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9102) HFile block pre-loading for large sequential scan
Date Wed, 31 Jul 2013 17:15:52 GMT
Liyin Tang created HBASE-9102:
---------------------------------

             Summary: HFile block pre-loading for large sequential scan
                 Key: HBASE-9102
                 URL: https://issues.apache.org/jira/browse/HBASE-9102
             Project: HBase
          Issue Type: Improvement
    Affects Versions: 0.89-fb
            Reporter: Liyin Tang
            Assignee: Liyin Tang


The current HBase scan model cannot take full advantage of the aggrediate disk throughput,
especially for the large sequential scan cases. And for the large sequential scan, it is easy
to predict what the next block to read in advance so that it can pre-load and decompress/decoded
these data blocks from HDFS into block cache right before the current read point. 

Therefore, this jira is to optimized the large sequential scan performance by pre-loading
the HFile blocks into the block cache in a stream fashion so that the scan query can read
from the cache directly.

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