DFSClient receives out of order packet ack
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Key: HDFS-1346
URL: https://issues.apache.org/jira/browse/HDFS-1346
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node, hdfs client
Affects Versions: 0.20-append
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.20-append
When running 0.20 patched with HDFS-101, we sometimes see an error as follow:
WARN hdfs.DFSClient: DFSOutputStream ResponseProcessor exception for block
blk_-2871223654872350746_21421120java.io.IOException: Responseprocessor:
Expecting seq
no for block blk_-2871223654872350746_21421120 10280 but received 10281
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$ResponseProcessor.run(DFSClient.java:2570)
This indicates that DFS client expects an ack for packet N, but receives an ack
for packet N+1.
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