LeonGao91 commented on a change in pull request #2625:
URL: https://github.com/apache/hadoop/pull/2625#discussion_r566443106
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File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/MountVolumeInfo.java
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@@ -102,9 +116,28 @@ boolean addVolume(FsVolumeImpl volume) {
return true;
}
-
void removeVolume(FsVolumeImpl target) {
storageTypeVolumeMap.remove(target.getStorageType());
+ capacityRatioMap.remove(target.getStorageType());
+ }
+
+ /**
+ * Set customize capacity ratio for a storage type.
+ * Return false if the value is too big.
+ */
+ boolean setCapacityRatio(StorageType storageType,
+ double capacityRatio) {
+ double leftover = 1;
+ for (Map.Entry<StorageType, Double> e : capacityRatioMap.entrySet()) {
+ if (e.getKey() != storageType) {
+ leftover -= e.getValue();
+ }
+ }
+ if (leftover < capacityRatio) {
+ return false;
+ }
+ capacityRatioMap.put(storageType, capacityRatio);
Review comment:
I think later it will be convenient when we add a feature to update the
capacity ratio without restarting datanode. It should be pretty harmless for
now.
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