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https://issues.apache.org/jira/browse/HDFS-17685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Charles Connell updated HDFS-17685:
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Description:
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.
was:
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 use 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.
> 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
>
> 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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