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

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Michael Stack 2018-04-04 11:25:25 -07:00
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src/main/asciidoc/_chapters/schema_design.adoc
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@ -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 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. 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, 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]. 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 The link:https://issues.apache.org/jira/browse/HDFS-347[HDFS-347] issue also makes for an