farmmamba created HDFS-17267:
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Summary: Client send the smae packet multiple times when method
markSlowNode throws IOException.
Key: HDFS-17267
URL: https://issues.apache.org/jira/browse/HDFS-17267
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 3.3.6
Reporter: farmmamba
Assignee: farmmamba
Since we have HDFS-16348, we can kick out SLOW node in pipeline when writing
data to pipeline.
And I think it introduced a problem, that is the same packet will be sent twice
or more times when we kick out SLOW node.
The flow are as below:
1、 DFSPacket p1 is pushed into dataQueue.
2、DataStreamer takes DFSPacket p1 from dataQueue.
3、Remove p1 from dataQueue and push p1 into ackQueue.
4、sendPacket(p1).
5、In ResponseProcessor#run, read pipelineAck for p1.
6、We meet SlOW node, so method markSlowNode throw IOException and does not
execute `ackQueue.removeFirst();`.
7、In next loop of DataStreamer#run, we come into method
processDatanodeOrExternalError and execute `dataQueue.addAll(0, ackQueue);`.
8、the p1 will be sent repeatedly.
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