Provided by: ceph-common_0.80.11-0ubuntu1.14.04.4_amd64 
NAME
ceph-dencoder - ceph encoder/decoder utility
SYNOPSIS
ceph-dencoder [commands...]
DESCRIPTION
ceph-dencoder is a utility to encode, decode, and dump ceph data structures. It is used for debugging
and for testing inter-version compatibility.
ceph-dencoder takes a simple list of commands and performs them in order.
COMMANDS
version
Print the version string for the ceph-dencoder binary.
import <file>
Read a binary blob of encoded data from the given file. It will be placed in an in-memory buffer.
export <file>
Write the contents of the current in-memory buffer to the given file.
list_types
List the data types known to this build of ceph-dencoder.
type <name>
Select the given type for future encode or decode operations.
decode Decode the contents of the in-memory buffer into an instance of the previously selected type. If
there is an error, report it.
encode Encode the contents of the in-memory instance of the previously selected type to the in-memory
buffer.
dump_json
Print a JSON-formatted description of the in-memory object.
count_tests
Print the number of built-in test instances of the previosly selected type that ceph-dencoder is
able to generate.
select_test <n>
Select the given build-in test instance as a the in-memory instance of the type.
get_features
Print the decimal value of the feature set supported by this version of ceph-dencoder. Each bit
represents a feature. These correspond to CEPH_FEATURE_* defines in src/include/ceph_features.h.
set_features <f>
Set the feature bits provided to encode to f. This allows you to encode objects such that they
can be understood by old versions of the software (for those types that support it).
EXAMPLE
Say you want to examine an attribute on an object stored by ceph-osd. You can do:
$ cd /mnt/osd.12/current/2.b_head
$ attr -l foo_bar_head_EFE6384B
Attribute "ceph.snapset" has a 31 byte value for foo_bar_head_EFE6384B
Attribute "ceph._" has a 195 byte value for foo_bar_head_EFE6384B
$ attr foo_bar_head_EFE6384B -g ceph._ -q > /tmp/a
$ ceph-dencoder type object_info_t import /tmp/a decode dump_json
{ "oid": { "oid": "foo",
"key": "bar",
"snapid": -2,
"hash": 4024842315,
"max": 0},
"locator": { "pool": 2,
"preferred": -1,
"key": "bar"},
"category": "",
"version": "9'1",
"prior_version": "0'0",
"last_reqid": "client.4116.0:1",
"size": 1681,
"mtime": "2012-02-21 08:58:23.666639",
"lost": 0,
"wrlock_by": "unknown.0.0:0",
"snaps": [],
"truncate_seq": 0,
"truncate_size": 0,
"watchers": {}}
AVAILABILITY
ceph-dencoder is part of the Ceph distributed storage system. Please refer to the Ceph documentation at
http://ceph.com/docs for more information.
SEE ALSO
ceph(8)
COPYRIGHT
2010-2014, Inktank Storage, Inc. and contributors. Licensed under Creative Commons BY-SA