nbdkit-retry-request-filter - Man Page

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=N

The number of seconds to wait before retrying.  The default is 2 seconds.

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).

Authors

Richard W.M. Jones

License

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

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.

Referenced By

nbdkit(1), nbdkit-captive(1), nbdkit-curl-plugin(1), nbdkit-error-filter(1), nbdkit-filter(3), nbdkit-release-notes-1.30(1), nbdkit-retry-filter(1).

2022-11-18 nbdkit-1.33.3