DataXceiver and BlockReader disagree on when to send/recv CHECKSUM_OK
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Key: HDFS-1001
URL: https://issues.apache.org/jira/browse/HDFS-1001
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 0.22.0
Reporter: bc Wong
Running the TestPread with additional debug statements reveals that the
BlockReader sends CHECKSUM_OK when the DataXceiver doesn't expect it. Currently
it doesn't matter since DataXceiver closes the connection after each op, and
CHECKSUM_OK is the last thing on the wire. But if we want to cache connections,
they need to agree on the exchange of CHECKSUM_OK.
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