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https://issues.apache.org/jira/browse/HDFS-13923?focusedWorklogId=712654&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-712654
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ASF GitHub Bot logged work on HDFS-13923:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 21/Jan/22 07:30
Start Date: 21/Jan/22 07:30
Worklog Time Spent: 10m
Work Description: tomscut opened a new pull request #3912:
URL: https://github.com/apache/hadoop/pull/3912
JIRA: [HDFS-13923](https://issues.apache.org/jira/browse/HDFS-13923).
Remove the `TODO comment` that are not needed.
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Issue Time Tracking
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Worklog Id: (was: 712654)
Remaining Estimate: 0h
Time Spent: 10m
> Add a configuration to turn on/off observer reads
> -------------------------------------------------
>
> Key: HDFS-13923
> URL: https://issues.apache.org/jira/browse/HDFS-13923
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Chao Sun
> Assignee: Shweta
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In some situations having a config to turn on/off observer reads dynamically
> may be useful. For instance, some applications may be sensitive for data
> freshness and want to always reach directly to active NN. In a more complex
> scenario, services such as Presto may want to apply observer reads for
> different types of queries. In this case, simply change
> {{dfs.client.failover.proxy.provider.<nameservice>}} may not be enough, since
> with FileSystem cache (which is usually turned on) will ignore the change and
> still use the same FileSystem object.
> Here I'm proposing to add a flag in {{HdfsClientConfigKeys}}, such as
> {{dfs.client.observer.reads.enabled}}, that can be used to dynamically turn
> on/off observer reads. The FileSystem cache key should also take account of
> this flag in its {{hashCode}} and {{equals}} impl, so that different
> FileSystem objects will be used depending on the flag.
>
> cc [~shv], [~xkrogen], [~vagarychen], [~zero45] for discussion.
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