Clients can hang in close if processDatanodeError throws Exception ( ex: OOME).
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Key: HDFS-2850
URL: https://issues.apache.org/jira/browse/HDFS-2850
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs client
Affects Versions: 1.0.1
Reporter: Uma Maheswara Rao G
Assignee: Uma Maheswara Rao G
I met a situation, where DataStreamer#processDatanodeError throws OOME when
creating ResponseProcessor thread.
Due to this Datastreamer thread died. When clinet closing the stream, it keeps
waiting.
Looks this is because, when clinet closes, it will enque one packet by marking
that a lastpacket and wait for the ack. Here Datastreamer thread died and no
one is there for processsing the packet from dataqueue. Obviously will not get
any ack and it will keep wait in close.
This i have seen in 20.2 version. when i verified, this problem will not be
there in trunk as processDatanodeError already guarded with try/catch. This
problem can be there in branch-1
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