HBASE-20337 Update the doc on how to setup shortcircuit reads; its stale; 
ADDENDUM


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/8bc72347
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/8bc72347
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/8bc72347

Branch: refs/heads/HBASE-19064
Commit: 8bc723477b60ce1ed0a71081630459621cb0f284
Parents: d60decd
Author: Michael Stack <st...@apache.org>
Authored: Wed Apr 4 11:25:25 2018 -0700
Committer: Michael Stack <st...@apache.org>
Committed: Wed Apr 4 11:25:25 2018 -0700

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 src/main/asciidoc/_chapters/schema_design.adoc | 5 +++++
 1 file changed, 5 insertions(+)
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http://git-wip-us.apache.org/repos/asf/hbase/blob/8bc72347/src/main/asciidoc/_chapters/schema_design.adoc
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diff --git a/src/main/asciidoc/_chapters/schema_design.adoc 
b/src/main/asciidoc/_chapters/schema_design.adoc
index 12d449b..a25b85e 100644
--- a/src/main/asciidoc/_chapters/schema_design.adoc
+++ b/src/main/asciidoc/_chapters/schema_design.adoc
@@ -1173,6 +1173,11 @@ Otherwise, shortcircuit read operates quietly in 
background. It does not provide
 no optics on how effective it is but read latencies should show a marked 
improvement, especially if
 good data locality, lots of random reads, and dataset is larger than available 
cache.
 
+Other advanced configurations that you might play with, especially if 
shortcircuit functionality
+is complaining in the logs,  include 
`dfs.client.read.shortcircuit.streams.cache.size` and
+`dfs.client.socketcache.capacity`. Documentation is sparse on these options. 
You'll have to
+read source code.
+
 For more on short-circuit reads, see Colin's old blog on rollout,
 
link:http://blog.cloudera.com/blog/2013/08/how-improved-short-circuit-local-reads-bring-better-performance-and-security-to-hadoop/[How
 Improved Short-Circuit Local Reads Bring Better Performance and Security to 
Hadoop].
 The link:https://issues.apache.org/jira/browse/HDFS-347[HDFS-347] issue also 
makes for an

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