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https://issues.apache.org/jira/browse/HDFS-9598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123138#comment-15123138
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Yong Zhang commented on HDFS-9598:
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In a high load of reading hdfs application, such as HBase, direct buffer may
allocate failed in for some read request but not all, so in this case we can
allocate heap buffer.
This case is not very frequently, DEBUG level could be changed to WARN.
> Use heap buffer in PacketReceiver If hdfs client has no enough free direct
> buffer.
> ----------------------------------------------------------------------------------
>
> Key: HDFS-9598
> URL: https://issues.apache.org/jira/browse/HDFS-9598
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Yong Zhang
> Assignee: Yong Zhang
> Attachments: HDFS-9598.001.patch, HDFS-9598.002.patch
>
>
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