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

["Shubham Dewan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-14179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shubham Dewan updated HDFS-14179:
---------------------------------
    Attachment: HDFS-14179.001.patch
        Status: Patch Available  (was: Open)

> 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
>            Assignee: Shubham Dewan
>            Priority: Major
>              Labels: newbie
>         Attachments: HDFS-14179.001.patch
>
>
> 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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