Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/224#discussion_r103723706
--- Diff:
core/src/main/java/org/apache/accumulo/core/client/admin/TableOperations.java
---
@@ -808,4 +812,64 @@ void setSamplerConfiguration(String tableName,
SamplerConfiguration samplerConfi
* @since 1.8.0
*/
SamplerConfiguration getSamplerConfiguration(String tableName) throws
TableNotFoundException, AccumuloException, AccumuloSecurityException;
+
+ /**
+ * This is a entry point for retrieving summaries with optional
restrictions.
+ *
+ * <p>
+ * Inorder to retrieve Summaries, the Accumulo user making the request
will need the {@link TablePermission#GET_SUMMARIES} table permission.
+ *
+ * <p>
+ * Accumulo stores summary data with each file in each tablet. In order
to make retrieving it faster there is a per tablet server cache of summary
data. The
+ * size of this cache is determined by the property {code
tserver.cache.summary.size}. When summary data for a file is not present, it
will be retrieved using
+ * threads on the tserver. The property {@code
tserver.summary.retrieval.threads} determines the max number of threads the
tserver will use for this.
+ *
+ * <p>
+ * Since summary data is cached, its important to use the summary
selection options to only read the needed data into the cache.
+ *
+ * <p>
+ * Summary data will be merged on the tablet servers and then in this
client process. Therefore its important that the required summarizers are on
the clients
--- End diff --
s/its/it's/
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