Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/3713#discussion_r21990285
--- Diff: docs/configuration.md ---
@@ -852,6 +852,59 @@ Apart from these, the following properties are also
available, and may be useful
between nodes leading to flooding the network with those.
</td>
</tr>
+<tr>
+ <td><code>spark.shuffle.io.preferDirectBufs</code></td>
+ <td>true</td>
+ <td>
+ (Netty only) Off-heap buffers are used to reduce garbage collection
during shuffle and cache
+ block transfer. For environments where off-heap memory is tightly
limited, users may wish to
+ turn this off to force all allocations from Netty to be on-heap.
+ </td>
+</tr>
+<tr>
+ <td><code>spark.shuffle.io.numConnectionsPerPeer</code></td>
+ <td>1</td>
+ <td>
+ (Netty only) Connections between hosts are reused in order to reduce
connection buildup for
+ large clusters. For small clusters with many hard disks, this may
result in insufficient
--- End diff --
should this say many hard disks and a small number of hosts?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
