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Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2014/11/03 06:57:34 UTC

[jira] [Created] (HBASE-12411) Avoid seek + read completely?

Lars Hofhansl created HBASE-12411:
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             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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