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Full Discussion: Issue with ftp hanging
Top Forums UNIX for Advanced & Expert Users Issue with ftp hanging Post 302948381 by edstevens on Monday 29th of June 2015 11:36:27 AM
Old 06-29-2015
Issue with ftp hanging
I could have sworn I posted on this issue earlier a couple of weeks ago but now cannot find the thread to add some updated info so I guess I'll start from scratch.

Running on Oracle Linux 5.6, 64-bit.

I have a weekly job that does an ftp 'mget' to copy a bunch of files from a production server to a test server. The two servers are in two different data centers. One DC has all of our test servers and theoretically would be our disaster recovery location. The other DC has all the production servers. The script has been working flawlessly for years - until .....

We relocated the production DC. With that relocation we got a less reliable and lower bandwidth wireless (microwave ?) link between the two DC's.

Since the DC move, I have not had a successful ftp operation. In every case, it will successfully connect and copy several files, but eventually it will get to a file and just hang. When it hangs, it is not on the first file and it is not on the last file, so the issue has nothing to do with authorization or fundamental connectivity, nor does it have to do with housekeeping of getting started with the overall operation or getting it all wrapped up at the end.

A couple of other 'odd' observations:

1 - For a given set of files to be transferred, once the operation hangs, any repeated attempts hang on the same file.

2 - Each week it is working with an entirely different (newly created since the last week) set of files, so obviously hangs on a different file than the previous week, but see point 1.

3) I have a completely different pair of prod/test servers on which I occasionally have to do the same sort of ftp operation on demand rather than on schedule. It copies a much smaller set of files but exhibits the same 'hanging' behavior.

4) In order to get the real work done, I switched from ftp to scp. With that I can get the files copied and do the work needed, but it is taking much longer. The ftp - when it worked - took between 90 and 120 minutes. With scp it is taking between 6 and 7 hours. I do not know if this time difference is purely due to the bandwidth -- if ftp would now take as long if I could get it to work at all.

My primary question is what could be up with the 'hanging' issue in ftp, and how do I go about resolving it?
 

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LEARN ABOUT MOJAVE

dbix::class::storage::dbi::oracle::wherejoins

DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)	User Contributed Perl Documentation	  DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)

NAME

       DBIx::Class::Storage::DBI::Oracle::WhereJoins - Oracle joins in WHERE syntax support (instead of ANSI).

PURPOSE

       This module is used with Oracle < 9.0 due to lack of support for standard ANSI join syntax.

SYNOPSIS

       DBIx::Class should automagically detect Oracle and use this module with no work from you.

DESCRIPTION

       This class implements Oracle's WhereJoin support.  Instead of:

	   SELECT x FROM y JOIN z ON y.id = z.id

       It will write:

	   SELECT x FROM y, z WHERE y.id = z.id

       It should properly support left joins, and right joins.	Full outer joins are not possible due to the fact that Oracle requires the entire
       query be written to union the results of a left and right join, and by the time this module is called to create the where query and table
       definition part of the SQL query, it's already too late.

METHODS

       See DBIx::Class::SQLMaker::OracleJoins for implementation details.

BUGS

       Does not support full outer joins.  Probably lots more.

SEE ALSO

       DBIx::Class::SQLMaker
       DBIx::Class::SQLMaker::OracleJoins
       DBIx::Class::Storage::DBI::Oracle::Generic
       DBIx::Class

AUTHOR

       Justin Wheeler "<jwheeler@datademons.com>"

CONTRIBUTORS

       David Jack Olrik "<djo@cpan.org>"

LICENSE

       This module is licensed under the same terms as Perl itself.

perl v5.18.2							    2013-07-12			  DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)
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