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.\" ========================================================================
.\"
.IX Title "nbdkit-retry-request-filter 1"
.TH nbdkit-retry-request-filter 1 "2023-01-04" "nbdkit-1.32.5" "NBDKIT"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.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"
.IP "\fI\f(CI$filterdir\fI/nbdkit\-retry\-request\-filter.so\fR" 4
.IX Item "$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 (C) 2019\-2021 Red Hat Inc.
.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
\&\s-1THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS\s0 ''\s-1AS IS\s0'' \s-1AND
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\s0 (\s-1INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES\s0; \s-1LOSS OF
USE, DATA, OR PROFITS\s0; \s-1OR BUSINESS INTERRUPTION\s0) \s-1HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT\s0 (\s-1INCLUDING NEGLIGENCE OR OTHERWISE\s0) \s-1ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.\s0