Mike Drob created HBASE-20674:
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Summary: clean up short circuit read logic and docs
Key: HBASE-20674
URL: https://issues.apache.org/jira/browse/HBASE-20674
Project: HBase
Issue Type: Bug
Components: regionserver
Affects Versions: 2.0.0
Reporter: Mike Drob
Assignee: Mike Drob
Mailing list discussion at
https://lists.apache.org/thread.html/f6f73df0ceae29f762f9b9088e3ffd0bf8f109d3dd692df100bf4fd6@%3Cdev.hbase.apache.org%3E
There are several inconsistencies between how our docs claim we do things and
how we actually do things.
There are two docs sections that attempt to address how SCR should work.
dfs.client.read.shortcircuit.skip.checksum is advised to set to true, but our
code in separate places ignores it and then later sets it to true anyway.
CommonFSUtils and FSUtils duplicate code related to SCR setup.
There is a workaround in HFileSystem for a bug that's been fixed in all
versions of hadoop that we support. (HADOOP-9307)
We suggest setting dfs.client.read.shortcircuit.buffer.size to a value that is
very close to what we'd set it to anyway, without clearly explaining why this
is important.
There are other properties that we claim are important, but we don't offer any
suggestions or explanations.
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