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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12411) Avoid seek + read completely?
Date Mon, 03 Nov 2014 05:57:34 GMT
Lars Hofhansl created HBASE-12411:

             Summary: Avoid seek + read completely?
                 Key: HBASE-12411
                 URL: https://issues.apache.org/jira/browse/HBASE-12411
             Project: HBase
          Issue Type: Brainstorming
            Reporter: Lars Hofhansl

In the light of HDFS-6735 we might want to consider refraining from seek + read completely
and only perform preads.

For example currently a compaction can lock out every other scanner over the file which the
compaction is currently reading for compaction.

At the very least we can introduce an option to avoid seek + read, so we can allow testing
this in various scenarios.
This will definitely be of great importance for projects like Phoenix which parallelize queries
intra region (and hence readers will used concurrently by multiple scanner with high likelihood.)

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