Fix illegal type names when upgrading to 2.10.4 | Tarantool
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Administration Upgrades Fix illegal type names when upgrading to 2.10.4

Fix illegal type names when upgrading to 2.10.4

This is an upgrade guide for fixing one specific problem which could happen with field type names. It’s only relevant when you’re upgrading from a Tarantool version <=2.10.3 to >=2.10.4.

Before gh-5940 was fixed, the empty string, n, nu, s, and st (that is, leading parts of num and str) were accepted as valid field types. Since 2.10.4, Tarantool doesn’t accept these strings and they must be replaced with correct values num and str.

This instruction is also available on GitHub.

A snapshot can be validated against the issue using the following script:

#!/usr/bin/env tarantool

local xlog = require('xlog')
local json = require('json')

if arg[1] == nil then
    print(('Usage: %s xxxxxxxxxxxxxxxxxxxx.snap'):format(arg[0]))
    os.exit(1)
end

local illegal_types = {
    [''] = true,
    ['n'] = true,
    ['nu'] = true,
    ['s'] = true,
    ['st'] = true,
}

local function report_field_def(name, field_def)
    local msg = 'A field def in a _space entry %q contains an illegal type: %s'
    print(msg:format(name, json.encode(field_def)))
end

local has_broken_format = false

for _, record in xlog.pairs(arg[1]) do
    -- Filter inserts.
    if record.HEADER == nil or record.HEADER.type ~= 'INSERT' then
        goto continue
    end
    -- Filter _space records.
    if record.BODY == nil or record.BODY.space_id ~= 280 then
        goto continue
    end

    local tuple = record.BODY.tuple
    local name = tuple[3]
    local format = tuple[7]

    local is_format_broken = false
    for _, field_def in ipairs(format) do
        if illegal_types[field_def.type] ~= nil then
            report_field_def(name, field_def)
            is_format_broken = true
        end

        if illegal_types[field_def[2]] ~= nil then
            report_field_def(name, field_def)
            is_format_broken = true
        end

    end

    if is_format_broken then
        has_broken_format = true
        local msg = 'The following _space entry contains illegal type(s): %s'
        print(msg:format(json.encode(record)))
    end
    ::continue::
end

if has_broken_format then
    print('')
    print(('%s has an illegal type in a space format'):format(arg[1]))
    print('It is recommended to proceed with the upgrade instruction:')
    print('https://github.com/tarantool/tarantool/wiki/Fix-illegal-field-type-in-a-space-format-when-upgrading-to-2.10.4')
else
    print('Everything looks nice!')
end

os.exit(has_broken_format and 2 or 0)

If the snapshot contains the values that aren’t valid in 2.10.4, you’ll get an output like the following:

To fix the application file that contains illegal type names, add the following code in it before the box.cfg()/vshard.cfg()/cartridge.cfg() call.

Note

In Cartridge applications, the instance file is called init.lua.

-- Convert illegal type names in a space format that were
-- allowed before tarantool 2.10.4.

local log = require('log')
local json = require('json')

local transforms = {
    [''] = 'num',
    ['n'] = 'num',
    ['nu'] = 'num',
    ['s'] = 'str',
    ['st'] = 'str',
}

-- The helper for before_replace().
local function transform_field_def(name, field_def, field, new_type)
    local field_def_old_str = json.encode(field_def)
    field_def[field] = new_type
    local field_def_new_str = json.encode(field_def)

    local msg = 'Transform a field def in a _space entry %q: %s -> %s'
    log.info(msg:format(name, field_def_old_str, field_def_new_str))
end

-- _space trigger.
local function before_replace(_, tuple)
    if tuple == nil then return tuple end

    local name = tuple[3]
    local format = tuple[7]

    -- Update format if necessary.
    local is_format_changed = false
    for i, field_def in ipairs(format) do
        local new_type = transforms[field_def.type]
        if new_type ~= nil then
            transform_field_def(name, field_def, 'type', new_type)
            is_format_changed = true
        end

        local new_type = transforms[field_def[2]]
        if new_type ~= nil then
            transform_field_def(name, field_def, 2, new_type)
            is_format_changed = true
        end
    end

    -- No changed: skip.
    if not is_format_changed then return tuple end

    -- Rebuild the tuple.
    local new_tuple = tuple:transform(7, 1, format)
    log.info(('Transformed _space entry %s to %s'):format(
        json.encode(tuple), json.encode(new_tuple)))
    return new_tuple
end

-- on_schema_init trigger to set before_replace().
local function on_schema_init()
    box.space._space:before_replace(before_replace)
end

-- Set the trigger on _space.
box.ctl.on_schema_init(on_schema_init)

You can delete these triggers after the box.cfg()/vshard.cfg()/cartridge.cfg() call.

An example for a Cartridge application:

The triggers will report the changes the make in the following form:

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