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https://issues.apache.org/jira/browse/HDFS-12733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16851186#comment-16851186
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He Xiaoqiao edited comment on HDFS-12733 at 5/29/19 6:36 PM:
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To [~elgoiri], Thanks for taking a look.
{quote}Having the local edits in a HA setting might be valuable for some
scenarios but we are not removing this feature and we are keeping it as
enabled.{quote}
I am sorry that I do not retrieve the history about this local edits, but after
dig the implementation, I don't find the local edit will be used any times for
HA mode. And I also survey practical usages about this, the majority of guys
disable this local edits using different approaches. Please correct me if I
missing something.
{quote}The only thing I would question is whether to have
DFS_NAMENODE_EDITS_LOCAL_WRITE_DISABLE_KEY or
DFS_NAMENODE_EDITS_LOCAL_WRITE_ENABLE_KEY.{quote}
DFS_NAMENODE_EDITS_LOCAL_WRITE_DISABLE_KEY is OK for me If we keep local edit
logic and only add switch to disable it.
Thanks again.
was (Author: hexiaoqiao):
To [~elgoiri], Thanks for taking a look.
{quote}Having the local edits in a HA setting might be valuable for some
scenarios but we are not removing this feature and we are keeping it as
enabled.{quote}
I am sorry that I do not retrieve the history about this local edits, but after
dig the implementation, I don't find the local edit will be used any times. And
I also survey practical usages about this, the majority of guys disable this
local edits using different approaches. Please correct me if I missing
something.
{quote}The only thing I would question is whether to have
DFS_NAMENODE_EDITS_LOCAL_WRITE_DISABLE_KEY or
DFS_NAMENODE_EDITS_LOCAL_WRITE_ENABLE_KEY.{quote}
DFS_NAMENODE_EDITS_LOCAL_WRITE_DISABLE_KEY is OK for me If we keep local edit
logic and only add switch to disable it.
Thanks again.
> Option to disable to namenode local edits
> -----------------------------------------
>
> Key: HDFS-12733
> URL: https://issues.apache.org/jira/browse/HDFS-12733
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode, performance
> Reporter: Brahma Reddy Battula
> Assignee: Brahma Reddy Battula
> Priority: Major
> Attachments: HDFS-12733-001.patch, HDFS-12733-002.patch,
> HDFS-12733-003.patch, HDFS-12733.004.patch, HDFS-12733.005.patch
>
>
> As of now, Edits will be written in local and shared locations which will be
> redundant and local edits never used in HA setup.
> Disabling local edits gives little performance improvement.
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