[jira] [Resolved] (HDFS-17204) EC: Reduce unnecessary log when processing excess redundancy.

["Xiaoqiao He (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-17204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiaoqiao He resolved HDFS-17204.
--------------------------------
    Fix Version/s: 3.4.0
     Hadoop Flags: Reviewed
       Resolution: Fixed

> EC: Reduce unnecessary log when processing excess redundancy.
> -------------------------------------------------------------
>
>                 Key: HDFS-17204
>                 URL: https://issues.apache.org/jira/browse/HDFS-17204
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Shuyan Zhang
>            Assignee: Shuyan Zhang
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>
> This is a follow-up of [HDFS-16964|https://issues.apache.org/jira/browse/HDFS-16964]. We now avoid stale replicas when dealing with redundancy. This may result in redundant replicas not being in the `nonExcess` set when we enter `BlockManager#chooseExcessRedundancyStriped` (because the datanode where the redundant replicas are located has not send FBR yet, so those replicas are filtered out and not added to the `nonExcess` set). A further result is that no excess storage type is selected and the log "excess types chosen for block..." is printed. When a failover occurs, a large number of datanodes become stale, which causes NameNodes to print a large number of unnecessary logs.
> This issue needs to be fixed, otherwise the performance after failover will be affected.



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