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https://issues.apache.org/jira/browse/HDFS-6999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14125275#comment-14125275
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Yang Jiandan commented on HDFS-6999:
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We can't reproduce stably and don't know exactly the particular combination
now. In our Configuration "dfs.datanode.transferTo.allowed"= ture, So We doube
BlockSender may only sends the head of packet and don't send the data part of
the packet because of some reasons.
> PacketReceiver#readChannelFully is in an infinite loop
> ------------------------------------------------------
>
> Key: HDFS-6999
> URL: https://issues.apache.org/jira/browse/HDFS-6999
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, hdfs-client
> Affects Versions: 2.4.1
> Reporter: Yang Jiandan
> Priority: Critical
>
> In our cluster, we found hbase handler may be never return when it reads hdfs
> file using RemoteBlockReader2, and the hander thread occupys 100% cup. wo
> found this is because PacketReceiver#readChannelFully is in an infinite loop.
> the following while never break.
> {code:xml}
> while (buf.remaining() > 0) {
> int n = ch.read(buf);
> if (n < 0) {
> throw new IOException("Premature EOF reading from " + ch);
> }
> }
> {code}
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