[
https://issues.apache.org/jira/browse/HDFS-15025?focusedWorklogId=481836&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-481836
]
ASF GitHub Bot logged work on HDFS-15025:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Sep/20 01:12
Start Date: 11/Sep/20 01:12
Worklog Time Spent: 10m
Work Description: YaYun-Wang commented on a change in pull request #2189:
URL: https://github.com/apache/hadoop/pull/2189#discussion_r486716471
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/StorageType.java
##########
@@ -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:
> My final query then, why can't have one NVDIMM like one SSD as this
also movable and peristent..?
Considering NVDIMM is faster, so NVDIMM does not use `FsDatasetCache()`
which SSD needs in the design.
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Issue Time Tracking
-------------------
Worklog Id: (was: 481836)
Time Spent: 4h (was: 3h 50m)
> Applying NVDIMM storage media to HDFS
> -------------------------------------
>
> Key: HDFS-15025
> URL: https://issues.apache.org/jira/browse/HDFS-15025
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, hdfs
> Reporter: YaYun Wang
> Assignee: YaYun Wang
> Priority: Major
> Labels: pull-request-available
> Attachments: Applying NVDIMM to HDFS.pdf, HDFS-15025.001.patch,
> HDFS-15025.002.patch, HDFS-15025.003.patch, HDFS-15025.004.patch,
> HDFS-15025.005.patch, HDFS-15025.006.patch, NVDIMM_patch(WIP).patch
>
> Time Spent: 4h
> Remaining Estimate: 0h
>
> The non-volatile memory NVDIMM is faster than SSD, it can be used
> simultaneously with RAM, DISK, SSD. The data of HDFS stored directly on
> NVDIMM can not only improves the response rate of HDFS, but also ensure the
> reliability of the data.
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