[jira] [Created] (HDFS-14179) BlockReaderRemote#readNextPacket() should log the waiting time for packet read.

["Surendra Singh Lilhore (JIRA)" <ji...@apache.org>]

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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