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Posted to issues@hbase.apache.org by "Liyin Tang (JIRA)" <ji...@apache.org> on 2013/07/31 19:15:52 UTC

[jira] [Created] (HBASE-9102) HFile block pre-loading for large sequential scan

Liyin Tang created HBASE-9102:
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             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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