Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5036#discussion_r26521756
--- Diff: docs/configuration.md ---
@@ -746,6 +746,18 @@ Apart from these, the following properties are also
available, and may be useful
</td>
</tr>
<tr>
+ <td><code>spark.files.useFetchCache</code></td>
+ <td>true</td>
+ <td>
+ If file fetching should use local caching. The improves performance
when running multiple
--- End diff --
I'd reword this slightly in order to match the style of similar boolean
options. How about this:
> If set to true (default), file fetching will use a local cache that is
shared by executors that belong to the same application, which can improve task
launching performance when running many executors on the same host. If set to
false, these caching optimizations will be disabled and all executors will
fetch their own copies of files. This optimization may be disabled in order to
use NFS filesystems as Spark local directories (see <a
href="https://issues.apache.org/jira/browse/SPARK-6313";>SPARK-6313</a> for more
details).
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