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.\" ========================================================================
.\"
.IX Title "nbdkit-retry-request-filter 1"
.TH nbdkit-retry-request-filter 1 2024-04-21 nbdkit-1.38.1 NBDKIT
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH NAME
nbdkit\-retry\-request\-filter \- retry single requests on error
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 3
\& nbdkit \-\-filter=retry\-request PLUGIN
\&                   [retry\-request\-retries=N] [retry\-request\-delay=N]
\&                   [retry\-request\-open=false]
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\f(CW\*(C`nbdkit\-retry\-request\-filter\*(C'\fR is a filter for nbdkit that
transparently retries single requests if they fail.  This is useful
for plugins that are not completely reliable or have random behaviour.
For example \fBnbdkit\-curl\-plugin\fR\|(1) might behave this way if pointed
at a load balancer which sometimes redirects to a web server that is
not responsive.
.PP
An alternative filter with different trade-offs is
\&\fBnbdkit\-retry\-filter\fR\|(1).  That filter is more heavyweight because it
always reopens the whole plugin connection on failure.
.SH PARAMETERS
.IX Header "PARAMETERS"
.IP \fBretry\-request\-retries=\fRN 4
.IX Item "retry-request-retries=N"
The number of times any single request will be retried before we give
up and fail the operation.  The default is 2.
.IP \fBretry\-request\-delay=\fRN 4
.IX Item "retry-request-delay=N"
The number of seconds to wait before retrying.  The default is 2
seconds.
.IP \fBretry\-request\-open=false\fR 4
.IX Item "retry-request-open=false"
If set to false, do not retry opening the plugin.  The default is to
treat plugin open in the same way as other requests.
.SH FILES
.IX Header "FILES"
.ie n .IP \fR\fI$filterdir\fR\fI/nbdkit\-retry\-request\-filter.so\fR 4
.el .IP \fR\f(CI$filterdir\fR\fI/nbdkit\-retry\-request\-filter.so\fR 4
.IX Item "$filterdir/nbdkit-retry-request-filter.so"
The filter.
.Sp
Use \f(CW\*(C`nbdkit \-\-dump\-config\*(C'\fR to find the location of \f(CW$filterdir\fR.
.SH VERSION
.IX Header "VERSION"
\&\f(CW\*(C`nbdkit\-retry\-filter\*(C'\fR first appeared in nbdkit 1.30.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBnbdkit\fR\|(1),
\&\fBnbdkit\-filter\fR\|(3),
\&\fBnbdkit\-readahead\-filter\fR\|(1),
\&\fBnbdkit\-retry\-filter\fR\|(1).
.SH AUTHORS
.IX Header "AUTHORS"
Richard W.M. Jones
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright Red Hat
.SH LICENSE
.IX Header "LICENSE"
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
.IP \(bu 4
Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
.IP \(bu 4
Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
.IP \(bu 4
Neither the name of Red Hat nor the names of its contributors may be
used to endorse or promote products derived from this software without
specific prior written permission.
.PP
THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.