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https://issues.apache.org/jira/browse/HDFS-14882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941748#comment-16941748
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Xiaoqiao He commented on HDFS-14882:
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[~lukmajercak], Thanks for your comments. This ticket is plan to adjust and
sort location considering nodes' load whose distance to client is same.
{quote}I only wish we could also use some sort of an estimate of load that
we've already scheduled on each DN, not just xceivers reported by them.{quote}
Sorry I don't understand that clearly. IIUC, we are also estimating load of
node using its xceiver count when schedule write ops currently. Please correct
me if i am wrong. Thanks.
> Consider DataNode load when #getBlockLocation
> ---------------------------------------------
>
> Key: HDFS-14882
> URL: https://issues.apache.org/jira/browse/HDFS-14882
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Xiaoqiao He
> Assignee: Xiaoqiao He
> Priority: Major
> Attachments: HDFS-14882.001.patch
>
>
> Currently, we consider load of datanode when #chooseTarget for writer,
> however not consider it for reader. Thus, the process slot of datanode could
> be occupied by #BlockSender for reader, and disk/network will be busy
> workload, then meet some slow node exception. IIRC same case is reported
> times. Based on the fact, I propose to consider load for reader same as it
> did #chooseTarget for writer.
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