If xrootd is dead, then it's probably misconfigured somehow. I'll need to see the xrootd log and a list of db/tables to start.
My current wild guess is that the worker couldn't find any dbs to publish.
-Daniel
(typed on a small touch screen)
On Nov 11, 2014 6:00 PM, Tatiana Goldina <[log in to unmask]> wrote:
>
> Yes, we figured that whenever select statements (like "select count …") hang, the qserv status shows that "xrootd is dead" and qserv has to be restarted.
>
> We also confirmed that we can not connect to Qserv's mysql proxy using JDBC. The error we get is
>
> SQLException: Qserv error: 'ParseException:ANTLR parse error:unexpected token: /:'
>
> I am including John Rector, who did set up the QSERV for us. He has more details.
>
> Tatiana
>
>
> On Nov 11, 2014, at 3:59 PM, Jacek Becla <[log in to unmask]> wrote:
>
> > Tatiana
> >
> > When you are talking to Qserv, the front end that you are talking to
> > is mysql proxy (which looks exactly like standard mysql on the surface).
> > Under the hood, we are intercepting each query and do all sorts of
> > somewhat uncommon things. The bottom line is that
> > "select columns from %table%' from mysql" will not give you what
> > is expected, because were is currently not handled
> > by qserv/mysqlProxy.
> >
> >
> > Regarding the issue with DeepCoadd, I vaguely recall DeepCoadd
> > is a view, and there were some issues with views in the past.
> > Looking at the log files from qserv czar and xrootd would help
> > understand this problem, do you know where to look?
> >
> > Jacek
> >
> >
> >
> > On 11/11/2014 12:27 PM, Tatiana Goldina wrote:
> >> Thank you for a quick reply.
> >>
> >> I am issuing "select columns from %table%' from mysql command line
> >> client. For now this is the only client that I know which can connect
> >> to QSERVE mysql proxy. It could be that MySQL Query Browser and
> >> IntelliJ (via JDBC driver) fail to connect because in addition to
> >> connecting they try to get extra information about the the schema. I'll
> >> test it tonight.
> >>
> >> The other issue is that I can not make any of the select statements
> >> work. It appears to hang for a long while, then produces an error. For
> >> example, how do I get a row count for a table?
> >>
> >> mysql> select count(deepCoaddId) from DeepCoadd;
> >> ERROR 4120 (Proxy): Error executing query using qserv.
> >>
> >> Tatiana
> >>
> >> On Nov 11, 2014, at 10:14 AM, Serge Monkewitz <[log in to unmask]
> >> <mailto:[log in to unmask]>> wrote:
> >>
> >>> Hi Tatiana,
> >>>
> >>> I’m moving this discussions to the qserv mailing list. There’s a
> >>> page on the SQL constructs that qserv supports here:
> >>> https://dev.lsstcorp.org/trac/wiki/db/ScalableArchSQL.
> >>>
> >>> In general, it’s SQL 92 minus sub-queries, and with some spatial
> >>> support. That means that MySQL specific syntax usually isn’t
> >>> supported. Unfortunately, I’m not aware of a page that lists out the
> >>> exact MySQLisms that we do support, but I believe it’s limited to:
> >>>
> >>> SHOW TABLES
> >>> SHOW DATABSES
> >>> DESCRIBE
> >>>
> >>> Are you saying that the JDBC driver itself is issuing SHOW COLUMNS, or
> >>> is that initiated on your end?
> >>>
> >>> Cheers,
> >>> Serge
> >>>
> >>> Begin forwarded message:
> >>>
> >>>> *From: *Tatiana Goldina <[log in to unmask]
> >>>> <mailto:[log in to unmask]>>
> >>>> *Subject: **connecting to qserv database*
> >>>> *Date: *November 11, 2014 at 9:07:02 AM PST
> >>>> *To: *Serge Monkewitz <[log in to unmask]
> >>>> <mailto:[log in to unmask]>>
> >>>>
> >>>> Hi Serge,
> >>>>
> >>>> John Rector has set a QSERV for us here at IPAC, and we are trying
> >>>> to figure out how to access it.
> >>>>
> >>>> It seems that I can not access it with a MySql GUI client or JDBC
> >>>> (jdbc:mysql://lsst-db1.ipac.caltech.edu
> >>>> <http://lsst-db1.ipac.caltech.edu/>:4040/LSST)
> >>>>
> >>>> I am able to access it with command line mysql client. I can get the
> >>>> tables with "show tables;" but
> >>>>
> >>>> mysql> show columns from DeepSource from LSST;
> >>>> ERROR 4110 (Proxy): Qserv error: 'ParseException:ANTLR parse
> >>>> error:unexpected token: show:'
> >>>>
> >>>> (The same error that we get when trying to connect with JDBC.)
> >>>>
> >>>> On the other hand "describe DeepSource;" works.
> >>>>
> >>>> How do I find out which commands are supported?
> >>>>
> >>>> Tatiana
> >>>
> >>
> >>
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