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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2021/07/15 21:05:49 UTC

[GitHub] [hadoop] zhihaixu2012 commented on a change in pull request #3175: HDFS-16111. Add a configuration to RoundRobinVolumeChoosingPolicy to …

zhihaixu2012 commented on a change in pull request #3175:
URL: https://github.com/apache/hadoop/pull/3175#discussion_r670804904



##########
File path: hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@@ -2657,6 +2657,17 @@
   </description>
 </property>
 
+<property>
+  <name>dfs.datanode.round-robin-volume-choosing-policy.additional-available-space</name>
+  <value>0</value>

Review comment:
       Yes, Good suggestion. I think the reasonably good default number I want to set is 10 GB , which is the same as the default value of dfs.datanode.available-space-volume-choosing-policy.balanced-space-threshold. since AvailableSpaceVolumeChoosingPolicy uses this default value as balanced disk maximum difference. I think this value can safeguard the disk space and also not waste much disk storage.




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