==========================
#opendaylight-meeting: tws
==========================


Meeting started by tbachman at 18:00:00 UTC.  The full logs are
available at
http://meetings.opendaylight.org/opendaylight-meeting/2014/tws/opendaylight-meeting-tws.2014-11-24-18.00.log.html
.



Meeting summary
---------------

* agenda  (tbachman, 18:00:12)
  * presentation on XSQL  (tbachman, 18:00:38)

* XSQL presentation  (tbachman, 18:08:18)
  * xSQL is a query language for trees  (tbachman, 18:17:43)
  * xSQL examines the schema context of the yang models, and develops a
    blueprint using each node type in the tree with each parent
    (tbachman, 18:18:26)
  * This allows you to just extract data from a node in the tree just
    using a node type  (tbachman, 18:18:54)
  * For exmple, with a module structure of
    node/node-connectors/node-connector-statistics, xSQL will examine
    the schema contents and map that node-connector-statistics has a
    parent type of node-connector  (tbachman, 18:19:58)
  * It is modeled after the SQL language for queries  (tbachman,
    18:20:21)
  * dbainbri asks if select allows things like field matches  (tbachman,
    18:20:48)
  * Sharon says yes - it walks all the data, and currently doesn’t use
    indexes  (tbachman, 18:21:09)
  * It takes each node root and starts traversing the data according to
    the schema  (tbachman, 18:21:25)
  * right now is defined as one thread, but can do 20-30 at one time
    (tbachman, 18:21:43)
  * It also allows you to avoid joins with queries  (tbachman, 18:23:38)
  * dbainbri asks if they’ve looked into doing “graph-ish” qeuries, like
    “find all the nodes joined by this node-connector"  (tbachman,
    18:24:56)
  * Sharon says the yang model is a tree  (tbachman, 18:25:22)
  * Sharon says it all depends on how a link is defined between two
    edges  (tbachman, 18:26:38)
  * alagalah asks what projects need to do in order to leverage xSQL
    (tbachman, 18:32:05)
  * alagalah asks how rich the SQL-like language is  (tbachman,
    18:32:32)
  * LINK:
    https://www.opendaylight.org/sites/opendaylight/files/bk-user-guide.pdf
    Helium User Guide, which has section on xSQL  (tbachman, 18:37:34)
  * LINK:
    https://wiki.opendaylight.org/view/OpenDaylight_Controller:MD-SAL:XSQL
    XSQL Wiki page  (tbachman, 19:00:25)
  * Use “ telnet 0 34343” to telnet into the XSQL command handler
    (tbachman, 19:01:00)



Meeting ended at 19:01:55 UTC.



People present (lines said)
---------------------------

* tbachman (29)
* odl_meetbot (4)
* flaviof (2)
* alagalah (1)



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