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https://issues.apache.org/jira/browse/HDFS-16502?focusedWorklogId=740692&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-740692
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ASF GitHub Bot logged work on HDFS-16502:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 14/Mar/22 07:40
Start Date: 14/Mar/22 07:40
Worklog Time Spent: 10m
Work Description: virajjasani edited a comment on pull request #4064:
URL: https://github.com/apache/hadoop/pull/4064#issuecomment-1066468953
> Do we have a doc somewhere that lists the available configuration keys
that can be reconfigured? It would be nice for users to understand what can be
reconfigured.
We don't seem to have a doc as such but operator/admin can use `hdfs
dfsadmin -reconfig <namenode|datanode> <host:ipc_port> properties` to retrieve
reconfigurable properties.
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Issue Time Tracking
-------------------
Worklog Id: (was: 740692)
Time Spent: 1.5h (was: 1h 20m)
> Reconfigure Block Invalidate limit
> ----------------------------------
>
> Key: HDFS-16502
> URL: https://issues.apache.org/jira/browse/HDFS-16502
> Project: Hadoop HDFS
> Issue Type: Task
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Based on the cluster load, it would be helpful to consider tuning block
> invalidate limit (dfs.block.invalidate.limit). The only way we can do this
> without restarting Namenode as of today is by reconfiguring heartbeat
> interval
> {code:java}
> Math.max(heartbeatInt*20, blockInvalidateLimit){code}
> , this logic is not straightforward and operators are usually not aware of it
> (lack of documentation), also updating heartbeat interval is not desired in
> all the cases.
> We should provide the ability to alter block invalidation limit without
> affecting heartbeat interval on the live cluster to adjust some load at
> Datanode level.
> We should also take this opportunity to keep (heartbeatInterval * 20)
> computation logic in a common method.
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