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https://issues.apache.org/jira/browse/THRIFT-1642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406477#comment-13406477
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catxl commented on THRIFT-1642:
-------------------------------
Users will set timeout(ms), so i don't think we need do usleep.
> Miscalculation lead to throw unexpected "TTransportException::TIMED_OUT"(or
> called "EAGAIN (timed out)") exception
> ------------------------------------------------------------------------------------------------------------------
>
> Key: THRIFT-1642
> URL: https://issues.apache.org/jira/browse/THRIFT-1642
> Project: Thrift
> Issue Type: Bug
> Components: C++ - Library
> Affects Versions: 0.8
> Environment: GNU/Linux x86_64
> Reporter: catxl
> Priority: Critical
> Attachments: TSocket.cpp.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> In function 'uint32_t TSocket::read(uint8_t* buf, uint32_t len)', there's an
> miscalculation which can lead to wrong judgment:
> struct timeval begin;
> gettimeofday(&begin, NULL);
> //
> // do some thing
> //
> struct timeval end;
> gettimeofday(&end, NULL);
> uint32_t readElapsedMicros = (((end.tv_sec - begin.tv_sec) * 1000 * 1000)
> + (((uint64_t)(end.tv_usec - begin.tv_usec))));
> 'readElapsedMicros' will be very large when 'end.tv_usec < begin.tv_usec'.
> This will lead to throw unexpected "TTransportException::TIMED_OUT"(or called
> "EAGAIN (timed out)") exception sometimes.
> Besides,
> (1)I don't think the "usleep(50);" call in the same function above is
> necessary, I think delete this call could improve performance.
> (2)I don't know why 'readElapsedMicros' compare with 'eagainThresholdMicros',
> which is not the value (recvTimeout_*1000), but:
> eagainThresholdMicros = (recvTimeout_*1000)/ ((maxRecvRetries_>0) ?
> maxRecvRetries_ : 2);
> can anyone tell me someting about this? Thank you!
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