Surendra Singh Lilhore created HDFS-14179:
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Summary: BlockReaderRemote#readNextPacket() should log the waiting
time for packet read.
Key: HDFS-14179
URL: https://issues.apache.org/jira/browse/HDFS-14179
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs-client
Affects Versions: 3.0.0
Reporter: Surendra Singh Lilhore
Sometime read is reported very slow due to disk or some other reason.
{{BlockReaderRemote#readNextPacket()}} should print the datanode IP and waiting
time in trace log.
{code:java}
//Read packet headers.
packetReceiver.receiveNextPacket(in);
PacketHeader curHeader = packetReceiver.getHeader();
curDataSlice = packetReceiver.getDataSlice();
assert curDataSlice.capacity() == curHeader.getDataLen();
LOG.trace("DFSClient readNextPacket got header {}", curHeader);{code}
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