charlesconnell opened a new pull request, #7215:
URL: https://github.com/apache/hadoop/pull/7215
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### Description of PR
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](https://issues.apache.org/jira/browse/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.
### How was this patch tested?
Unit tests are included in this PR for the new logic. I have also tested the
new feature in my company's HBase infrastructure.
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] ~Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?~ not
applicable
- [ ] ~If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?~ not applicable
- [ ] ~If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?~ not applicable
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