Memcached Question posted in
A decent usage manual can be found here.

Memcached – Why would socket.write hang indefinitely?

What would make a write call to a TCPSocket hang indefinitely?

lotsOfBytes = # a really large number of bytes, like 1 or 2 MB of data

socket = TCPSocket.new # some config
socket.write(lotsOfBytes) # this line hangs

I am trying to debug an issue where a get_multi operation sent to memcached with a large number of keys hangs indefinitely, and it does so on a line that resembles that code snippet. I’m trying to better understand how the low-level sockets on which this library is built are expected to work.

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Answers


  1. 0

    What are the values of following attributes on your TCPSocket:

    • Keep-alive activated and what value is set?
    • Timeout set and what value is set?

    If you will do a Wireshark dump, it’s much better so see what happens before hanging connection.

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  2. 0
    • tcpdump? are there any attempts to send anything?
    • netstat – for see output queue.
    • does it work on a small number of bytes in your environment?
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