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https://issues.apache.org/jira/browse/HDFS-15714?focusedWorklogId=581490&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-581490
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ASF GitHub Bot logged work on HDFS-15714:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 13/Apr/21 01:57
Start Date: 13/Apr/21 01:57
Worklog Time Spent: 10m
Work Description: Zhangshunyu commented on pull request #2655:
URL: https://github.com/apache/hadoop/pull/2655#issuecomment-818374335
Currentlly, alias map is based on LevelDB, and it is not support namenode
HA, right?
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Issue Time Tracking
-------------------
Worklog Id: (was: 581490)
Time Spent: 2h 10m (was: 2h)
> HDFS Provided Storage Read/Write Mount Support On-the-fly
> ---------------------------------------------------------
>
> Key: HDFS-15714
> URL: https://issues.apache.org/jira/browse/HDFS-15714
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, namenode
> Affects Versions: 3.4.0
> Reporter: Feilong He
> Assignee: Feilong He
> Priority: Major
> Labels: pull-request-available
> Attachments: HDFS-15714-01.patch,
> HDFS_Provided_Storage_Design-V1.pdf, HDFS_Provided_Storage_Performance-V1.pdf
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> HDFS Provided Storage (PS) is a feature to tier HDFS over other file systems.
> In HDFS-9806, PROVIDED storage type was introduced to HDFS. Through
> configuring external storage with PROVIDED tag for DataNode, user can enable
> application to access data stored externally from HDFS side. However, there
> are two issues need to be addressed. Firstly, mounting external storage
> on-the-fly, namely dynamic mount, is lacking. It is necessary to get it
> supported to flexibly combine HDFS with an external storage at runtime.
> Secondly, PS write is not supported by current HDFS. But in real
> applications, it is common to transfer data bi-directionally for read/write
> between HDFS and external storage.
> Through this JIRA, we are presenting our work for PS write support and
> dynamic mount support for both read & write. Please note in the community
> several JIRAs have been filed for these topics. Our work is based on these
> previous community work, with new design & implementation to support called
> writeBack mount and enable admin to add any mount on-the-fly. We appreciate
> those folks in the community for their great contribution! See their pending
> JIRAs: HDFS-14805 & HDFS-12090.
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