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From "Iliya Gurov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (THRIFT-4201) False positive timeout or blocking recv in the THttpTransport client
Date Thu, 18 May 2017 07:24:04 GMT

     [ https://issues.apache.org/jira/browse/THRIFT-4201?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Iliya Gurov updated THRIFT-4201:
--------------------------------
    Attachment: uts2.pcap

> False positive timeout or blocking recv in the THttpTransport client
> --------------------------------------------------------------------
>
>                 Key: THRIFT-4201
>                 URL: https://issues.apache.org/jira/browse/THRIFT-4201
>             Project: Thrift
>          Issue Type: Bug
>          Components: C++ - Library
>    Affects Versions: 0.10.0
>            Reporter: Iliya Gurov
>              Labels: C++, C++11, client, http, patch, transport
>         Attachments: httpTransportClientPatch.patch, uts2.pcap
>
>
> Before we get more data by doing refill in the *THttpTransport::readMoreData()*, we need
to check whether we have already the entire content in the buffer (fetched in the last *::recv*
in *TSocket::read()* while processing the previous chunk). Doing refill without this check
may lead to calling *::recv* even though all chunks (the entire content) are already in the
buffer. The effect of this is that the call fails either with a false positive timeout or
blocks in recv if no timeout is configured.
> Attached is the suggested patch and tcpdump pcap (you can clearly see there that we wait
for more data although we have already ACKed the last piece of byte - tcp.stream eq 26).



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