True, but it's possible for other queries to not touch the datastore as well. Would be interesting to try to break it and see what happens. Unplug a disk to see if neo still responds to read queries that are still in the cache. :)
And yeah you're right, ::1 doesn't work in the config file (which is odd), but if you bind to :: you can connect to ::1. Just tested with my go driver using the following connection string: db, err := sql.Open("neo4j-cypher", "http://[::1]:7474/") Wes On Wed, Dec 18, 2013 at 1:22 PM, Alan Robertson <al...@unix.sh> wrote: > I meant to say "::1". Right now, it won't hear local only ipv6 > connections... > > But your suggested query doesn't have to touch the data store at all. > Right? > > I would assume that either of the others I gave would touch the data > store, and would typically fail of the data store was hung or broken... > > I would assume your suggested query would not touch the data store. > > Is that a correct understanding? > > > > > On 12/18/2013 11:13 AM, Wes Freeman wrote: > > You can make it listen on :: if you set it in neo4j-server.properties: > # Let the webserver only listen on the specified IP. Default is localhost > (only > # accept local connections). Uncomment to allow any connection. Please see > the > # security section in the neo4j manual before modifying this. > org.neo4j.server.webserver.address=:: > > My favorite ultra-simple 2.0 query is "RETURN 1;"--which works even if > db is totally empty. > > Wes > > On Wed, Dec 18, 2013 at 10:56 AM, Alan Robertson <al...@unix.sh> wrote: > >> Thanks for the explanation. I have always (mistakenly) thought of the >> type of the relationship as a sort of property. >> >> In any case, the script seems to work quite nicely, and is easy to >> autogenerate the parameters for from Assimilation discovery information. >> >> I discovered something surprising (a bug?) about curl -- unless I give it >> the -g flag (don't expand globs), then it doesn't like ipv6 IP/port >> combinations - like [::ffff:127.0.0.1]:7474. IMHO, it shouldn't be >> trying to glob IP addresses... >> >> I noticed that neo4j doesn't appear to be ipv6 compliant (i.e., it >> doesn't listen on '::'). Is that intentional? >> >> In any case, the script seems to give neo4j some trivial, but meaningful >> exercise. You have to parse the query, optimize it, create a query plan, >> execute it, walk through the results, convert them to JSON and send them >> back out the REST interface. Quite a few things have to be working for it >> to succeed. >> >> Do you have a favorite trivial query that will succeed in any non-empty >> neo4j database? >> >> Do you have a better grep pattern for matching correct output? >> >> >> >> On 12/17/2013 11:18 PM, Michael Hunger wrote: >> >> return type(r) >> >> Empty curly braces mean no props >> >> Sent from mobile device >> >> Am 18.12.2013 um 06:41 schrieb Alan Robertson <al...@unix.sh> >> <al...@unix.sh>: >> >> >> The query in the script below produces the following output: >> {"results":[{"columns":["one","rel","two"],"data":[{"row":[{"domain":"metadata","nodetype":"CMAclass","name":"HbRing"},{},{"domain":"metadata","nodetype":"CMAclass","name":"CMAclass"}]}]}],"errors":[]} >> >> What I noticed is that the relationship shows up as {}. Do I need to >> change the query to get the relationship type? [See the script below >> for the query] >> >> In any case, below is a script which does a passable job of seeing if >> Neo4j is operational (and not dead, comatose, or laying on the ground >> twitching)... I'm going to write an OCF resource agent using it - so I >> can monitor neo4j "properly". And I could also make it highly-available >> using Pacemaker... >> >> It can use either wget or curl to talk to Neo4j. >> >> # >> # Simple script to monitor Neo4j for basic operation >> # >> # Potential inputs to this script are: >> # ipport: IP-port combination of the neo4j REST server >> # cypher: Cypher query string >> # regex: Regular expression to match server output against >> # grepflags: flags to give grep >> ipport='127.0.0.1:7474' >> ipport='[::ffff:127.0.0.1]:7474' >> cypher="START one=node(*) RETURN one LIMIT 1" >> # Need at least one node and one relationship for this one to succeed... >> cypher="START one=node(*) MATCH one-[rel]->two RETURN one, rel, two LIMIT 1" >> regex='^{ *"results" *: *\[.*\] *, *"errors" *: *\[ *\] *}$' >> grepflags="" >> # >> # Other variables in the script >> # queryjson: JSON-encapsulated version of cypher query >> # committrans: url suffix for committing transactions in one go >> # URL: URL to give to Neo4j REST service >> # header: Extra header information to give REST service (i.e., >> Content-type) >> queryjson="{\"statements\" : [ { \"statement\" : \"$cypher\" } ] }" >> committrans='db/data/transaction/commit' >> URL=http://${ipport}/${committrans} >> header='Content-type: application/json' >> use_wget=1 >> >> runquery() { >> if >> [ "$use_wget" -eq 1 ] >> then >> wget -q --header="${header}" --post-data="$queryjson" >> --output-document=- $URL >> else >> curl -s -g --header "${header}" --data "$queryjson" --output >> - $URL >> fi >> } >> monitor() { >> runquery | grep ${grepflags} "${regex}" >/dev/null >> } >> runquery >> monitor >> rc=$? >> echo $rc >> exit $rc >> >> >> >> -- >> Alan Robertson <al...@unix.sh> <al...@unix.sh> - @OSSAlanR >> >> "Openness is the foundation and preservative of friendship... Let me claim >> from you at all times your undisguised opinions." - William Wilberforce >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Neo4j" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to neo4j+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> >> -- >> Alan Robertson <al...@unix.sh> <al...@unix.sh> - @OSSAlanR >> >> "Openness is the foundation and preservative of friendship... Let me claim >> from you at all times your undisguised opinions." - William Wilberforce >> >> > > > -- > Alan Robertson <al...@unix.sh> <al...@unix.sh> - @OSSAlanR > > "Openness is the foundation and preservative of friendship... Let me claim > from you at all times your undisguised opinions." - William Wilberforce > > -- You received this message because you are subscribed to the Google Groups "Neo4j" group. To unsubscribe from this group and stop receiving emails from it, send an email to neo4j+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.