query

Netmap Query Language

Demo

SELECT 1 Country FILTER Location NE Europe

SELECT 2 Country FILTER Country NE Russia

Description

This is REPL for interacting with netmap with QueryLanguage in NEOFS and applying placement rules to it. Netmap and CRUSH enchacement with FILTERs is described in research plan.

Commands

To see help for specific command type command help.

help

help

Get a list of commands.

exit

exit

Exit program.

load

load <filename>

Load netmap from specified file.

save

save <filename>

Save netmap to specified file.

clear

clear

Clear current netmap.

query

query <STATEMENT>

SELECT Example:

>>> add 1 /Location:Europe/Country:Germany
>>> add 2 /Location:Europe/Country:Austria
>>> add 3 /Location:Asia/Country:Korea
>>> add 4 /Location:Asia/Country:Japan
>>> query SELECT 1 Location
>>> query SELECT 2 Country

FILTER Example

Operation can be one of EQ, NE, LT, LE, GT, GE:

>>> add 1 /Location:Europe/Country:Germany
>>> add 2 /Location:Europe/Country:Austria
>>> query SELECT 1 Country FILTER Country NE Austria

RF Example

Replication factor

>>> add 1 /Location:Europe/Country:Germany
>>> add 2 /Location:Europe/Country:France
>>> add 3 /Location:Europe/Country:Austria
>>> query RF 1 SELECT 1 Country FILTER Country NE Austria

get-selection

get-selection

Get nodes from current selection.

Example:

>>> load /examples/map2
>>> query SELECT 1 Country FILTER Location NE Asia
>>> get-selection
[13 14]

clear-selection

clear-selection

Clear current selection.

dump-selection

dump-selection <filename>

Dump netmap in graphical format. If using docker, /pics directory is mounted as temp on host.