NAME

       nbdkit-retry-request-filter - retry single requests on error

SYNOPSIS

        nbdkit --filter=retry-request PLUGIN
                          [retry-request-retries=N] [retry-request-delay=N]
                          [retry-request-open=false]

DESCRIPTION

       "nbdkit-retry-request-filter" 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
       nbdkit-curl-plugin(1) might behave this way if pointed at a load balancer which sometimes redirects to a
       web server that is not responsive.

       An alternative filter with different trade-offs is nbdkit-retry-filter(1).  That filter is more
       heavyweight because it always reopens the whole plugin connection on failure.

PARAMETERS

       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.

       retry-request-delay=DELAY
           The   time   to  wait  before  retrying.   The  default  is  2  seconds.   Any  format  supported  by
           nbdkit_parse_delay(3) is allowed here.

       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.

FILES

       $filterdir/nbdkit-retry-request-filter.so
           The filter.

           Use "nbdkit --dump-config" to find the location of $filterdir.

VERSION

       "nbdkit-retry-filter" first appeared in nbdkit 1.30.

SEE ALSO

       nbdkit(1), nbdkit-filter(3), nbdkit-readahead-filter(1), nbdkit-retry-filter(1), nbdkit_parse_delay(3).

AUTHORS

       Richard W.M. Jones

COPYRIGHT

       Copyright Red Hat

LICENSE

       Redistribution  and  use in source and binary forms, with or without modification, are permitted provided
       that the following conditions are met:

       •   Redistributions of source code must retain the above copyright notice, this list  of  conditions  and
           the following disclaimer.

       •   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.

       •   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.

       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.

nbdkit-1.42.2                                      2025-04-02                     nbdkit-retry-request-filter(1)