[
https://issues.apache.org/jira/browse/HDFS-17937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18090503#comment-18090503
]
ASF GitHub Bot commented on HDFS-17937:
---------------------------------------
huangzhaobo99 opened a new pull request, #8559:
URL: https://github.com/apache/hadoop/pull/8559
### Description of PR
JIRA: https://issues.apache.org/jira/browse/HDFS-17937
This patch adds **dfs.namenode.checkpoint.parallel.upload.max-threads** to
cap fsimage upload concurrency in StandbyCheckpointer when parallel upload is
enabled.
The limit is needed to avoid excessive simultaneous fsimage uploads in
multi-NameNode HA deployments, which can otherwise increase CPU/network/disk
pressure and impact checkpoint/upload stability.
Effective concurrency is now min(remoteNNAddresses.size(), max-threads),
with config/docs updates in DFSConfigKeys, CheckpointConf, and
hdfs-default.xml, plus validation that max-threads > 0.
### How was this patch tested?
Added TestStandbyCheckpoints#testCheckpointParallelUploadRespectsMaxThreads
UT to verify observed upload concurrency does not exceed configured max threads.
> Limit fsimage transfer concurrency during checkpoint with multiple NameNodes.
> -----------------------------------------------------------------------------
>
> Key: HDFS-17937
> URL: https://issues.apache.org/jira/browse/HDFS-17937
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Zhaobo Huang
> Assignee: Zhaobo Huang
> Priority: Major
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
