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Posted to hdfs-issues@hadoop.apache.org by "Siddharth Wagle (Jira)" <ji...@apache.org> on 2019/09/12 19:42:00 UTC
[jira] [Commented] (HDDS-2116) Create SCMAllocationManager as
background thread for pipeline creation
[ https://issues.apache.org/jira/browse/HDDS-2116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928846#comment-16928846 ]
Siddharth Wagle commented on HDDS-2116:
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I do not believe pipeline creation needs to be multi-threaded. The maximum number of pipelines would be created when: 1. Ozone is deployed on a cluster, 2. Adding a rack to the cluster that results in rebalance pipeline operation (This will be the hard part). So, adding the additional complexity of having pipelines created concurrently is unnecessary IMO.
> Create SCMAllocationManager as background thread for pipeline creation
> ----------------------------------------------------------------------
>
> Key: HDDS-2116
> URL: https://issues.apache.org/jira/browse/HDDS-2116
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Reporter: Li Cheng
> Priority: Major
>
> SCMAllocationManager can be leveraged to get a candidate set of datanodes based on placement policies. And it should make the pipeline creation process to be async and multi-thread. This should be done when we encounter with performance bottleneck in terms of pipeline creation.
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