Github user yucai commented on a diff in the pull request:
https://github.com/apache/spark/pull/10225#discussion_r48709207
--- Diff: docs/configuration.md ---
@@ -926,6 +926,21 @@ Apart from these, the following properties are also
available, and may be useful
</td>
</tr>
<tr>
+ <td><code>spark.storage.hierarchyStore</code></td>
+ <td>(none)</td>
+ <td>
+ Store blocks in different speed storage devices by hierarchy way.<br
/>
+ For example:<br />
+ <code>nvm 40GB, ssd 20GB</code><br />
+ It means the fastest is nvm(threshold 40GB), lower layer is
ssd(threshold 20GB), all the rest are the final layer.
+ The threshold means when the device's usable space is less than it,
dropping into the next layer.<br />
+ And then, You need configure "nvm" and "ssd" location in local
dirs.<br />
+ For example in Standalone, Mesos: <br />
+
<code>spark.local.dir=/mnt/nvm1,/mnt/ssd1,/mnt/ssd2,/mnt/others</code><br />
+ In Yarn, refer to the its document to configure
yarn.nodemanager.local-dirs<br />
--- End diff --
User does not need put ```spark.storage.hierarchyStore``` in
```yarn-site.xml```, they need configure ```yarn.nodemanager.local-dirs``` in
it only.
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