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https://issues.apache.org/jira/browse/HDFS-17685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17904135#comment-17904135
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ASF GitHub Bot commented on HDFS-17685:
---------------------------------------
charlesconnell commented on code in PR #7215:
URL: https://github.com/apache/hadoop/pull/7215#discussion_r1875925407
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml:
##########
@@ -3444,6 +3444,16 @@
</description>
</property>
+ <property>
+ <name>dfs.client.lease.renewal.interval.ms</name>
+ <value>0</value>
+ <description>
+ If set between 0 and 30000 inclusive, HDFS clients will renew leases for
files they are writing at this interval.
+ If dfs.client.lease.renewal.interval.ms is not set and
ipc.client.rpc-timeout.ms is set between 0 and 60000,
Review Comment:
It comes from existing behavior, yes. The lease renewal interval isn't
allowed to be longer than half of the NameNode's timeout, which is hard-coded
at 60 seconds.
> Option to explicitly choose DFS client lease renewal interval
> -------------------------------------------------------------
>
> Key: HDFS-17685
> URL: https://issues.apache.org/jira/browse/HDFS-17685
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: dfsclient
> Reporter: Charles Connell
> Priority: Minor
> Labels: pull-request-available
>
> Currently, DFSClients send lease renewals to the NameNode at an interval
> equal to half of {{ipc.client.rpc-timeout.ms}}. This logic dates back to 2009
> in HDFS-278. At my company, we are interested in using short DFS client
> timeouts (< 10 seconds). However, we're currently hesitant to do so because
> that would flood the NameNode with lease renewals.
> I propose a setting {{dfs.client.lease.renewal.interval.ms}} that, if
> nonzero, would be used as the lease renewal interval instead of
> {{ipc.client.rpc-timeout.ms / 2}}. This would be useful for advanced users
> that want to control their RPC timeout and lease renewals separately.
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