liuml07 commented on a change in pull request #2189:
URL: https://github.com/apache/hadoop/pull/2189#discussion_r483194125
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/StorageType.java
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@@ -34,28 +34,35 @@
@InterfaceStability.Unstable
public enum StorageType {
// sorted by the speed of the storage types, from fast to slow
- RAM_DISK(true),
- SSD(false),
- DISK(false),
- ARCHIVE(false),
- PROVIDED(false);
+ RAM_DISK(true, true),
+ NVDIMM(false, true),
+ SSD(false, false),
+ DISK(false, false),
+ ARCHIVE(false, false),
+ PROVIDED(false, false);
private final boolean isTransient;
+ private final boolean isRAM;
public static final StorageType DEFAULT = DISK;
public static final StorageType[] EMPTY_ARRAY = {};
private static final StorageType[] VALUES = values();
- StorageType(boolean isTransient) {
+ StorageType(boolean isTransient, boolean isRAM) {
this.isTransient = isTransient;
+ this.isRAM = isRAM;
}
public boolean isTransient() {
return isTransient;
}
+ public boolean isRAM() {
+ return isRAM;
+ }
Review comment:
Oh, I was thinking that allowing Balancer to move the NVDIMM data is by
design since they are not volatile. But if that is case, then we can update
Balancer code by replacing `isTransient()` call with `isRAM()` call. Not sure
if this makes more sense?
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