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Posted to hdfs-issues@hadoop.apache.org by "Xiao Chen (JIRA)" <ji...@apache.org> on 2018/10/12 03:41:00 UTC
[jira] [Assigned] (HDFS-12946) Add a tool to check rack
configuration against EC policies
[ https://issues.apache.org/jira/browse/HDFS-12946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xiao Chen reassigned HDFS-12946:
--------------------------------
Assignee: Kitti Nanasi (was: Xiao Chen)
> Add a tool to check rack configuration against EC policies
> ----------------------------------------------------------
>
> Key: HDFS-12946
> URL: https://issues.apache.org/jira/browse/HDFS-12946
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: erasure-coding
> Reporter: Xiao Chen
> Assignee: Kitti Nanasi
> Priority: Major
> Attachments: HDFS-12946.01.patch, HDFS-12946.02.patch
>
>
> From testing we have seen setups with problematic racks / datanodes that would not suffice basic EC usages. These are usually found out only after the tests failed.
> We should provide a way to check this beforehand.
> Some scenarios:
> - not enough datanodes compared to EC policy's highest data+parity number
> - not enough racks to satisfy BPPRackFaultTolerant
> - highly uneven racks to satisfy BPPRackFaultTolerant
> - highly uneven racks (so that BPP's considerLoad logic may exclude some busy nodes on the rack, resulting in #2)
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