I'm currently working through getting an old project up and running again - it uses both DSE Search and DSE Graph. I don't have too much experience with DSE, but right now I've created one keyspace for the regular cassandra db (searchable) and I've created a graph on the same server using the gremlin console.
The back-end is written in node.js and uses the dse-driver to get data from the DSE server.
When I run the cassandra server with the -g flag, the dse-driver runs fine, does exactly what I want it to do, but obviously, none of my search functionality works.
When I run the cassandra server with the -g and -s flags, my search functionality works, but then I receive errors whenever the backend tries to use the dse-driver to get data from the graph using the executeGraph function.
Is this something that can be fixed or do I need to create more nodes/clusters? I'm really new to DSE so your help is appreciated.
Error: com.google.common.util.concurrent.UncheckedExecutionException: com.google.inject.ProvisionException: Unable to provision, see the following errors:\n\n1) Error injecting constructor, com.datastax.bdp.gcore.datastore.DataStoreException: Failed to execute statement40f07a96-98bf-490c-a738-6c9d0021afba\n at com.datastax.bdp.graph.impl.DseGraphImpl.<init>(DseGraphImpl.java:192)\n at com.datastax.bdp.graph.impl.GraphModule.configure(Unknown Source) (via modules: com.datastax.bdp.graph.impl.DseGraphFactoryImpl$$Lambda$1580/1437671705 -> com.google.inject.util.Modules$OverrideModule -> com.datastax.bdp.graph.impl.GraphModule)\n while locating com.datastax.bdp.graph.impl.DseGraphImpl\n\n1 error\n
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I have configured New JanusGraph janusgraph-full-1.0.0-rc1 on centos 7 with janusgraph-cql-es.
But when i am connecting using apache-tinkerpop-gremlin-console-3.4.8/bin/gremlin.sh
it is throwing following exception :
after remote console
> g.V();
WARN org.apache.tinkerpop.gremlin.driver.MessageSerializer - Response [PooledUnsafeDirectByteBuf(ridx: 57, widx: 57, cap: 57)] could not be deserialized by org.apache.tinkerpop.gremlin.driver.ser.AbstractGryoMessageSerializerV3d0.
java.lang.IndexOutOfBoundsException: Index 127 out of bounds for length 0
at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
at java.base/java.util.Objects.checkIndex(Objects.java:372)
at java.base/java.util.ArrayList.get(ArrayList.java:459)
at org.apache.tinkerpop.shaded.kryo.util.MapReferenceResolver.getReadObject(MapReferenceResolver.java:60)
at org.apache.tinkerpop.shaded.kryo.Kryo.readReferenceOrNull(Kryo.java:834)
at org.apache.tinkerpop.shaded.kryo.Kryo.readObject(Kryo.java:684)
at org.apache.tinkerpop.gremlin.driver.ser.AbstractGryoMessageSerializerV3d0.deserializeResponse(AbstractGryoMessageSerializerV3d0.java:157)
And its also throwing error on server
08:40:45 WARN org.apache.tinkerpop.gremlin.server.handler.WsGremlinBinaryRequestDecoder.select - Gremlin Server is not configured with a serializer for the requested mime type [application/vnd.gremlin-v3.0+gryo-stringd] - using org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1 by default
08:40:45 WARN org.apache.tinkerpop.gremlin.server.handler.WsGremlinBinaryRequestDecoder.decode - Serialization error while decoding request
org.apache.tinkerpop.gremlin.driver.ser.SerializationException: The most significant bit should be set according to the format
at org.apache.tinkerpop.gremlin.driver.ser.binary.RequestMessageSerializer.readValue(RequestMessageSerializer.java:45) ~[gremlin-driver-3.6.1.jar:3.6.1]
at org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1.deserializeRequest(GraphBinaryMessageSerializerV1.java:175) ~[gremlin-driver-3.6.1.jar:3.6.1]
at org.apache.tinkerpop.gremlin.server.handler.WsGremlinBinaryRequestDecoder.decode(WsGremlinBinaryRequestDecoder.java:77) ~[gremlin-server-3.6.1.jar:3.6.1]
Need guidance on what is correct config that needs to be done, so that janusgraph works properly and i am able to access data using gremlin console.
Thanks.
Not every JanusGraph version is compatible with every TinkerPop version. The JanusGraph documentation contains a Version Compatibility Matrix which shows the versions of other project that are compatible with a given JanusGraph version. For JanusGraph 1.0, the compatible TinkerPop versions are 3.6.z. This already explains why you are having problems with Gremlin Console in version 3.4.8. Please use a 3.6.z version of Gremlin Console if you want to use JanusGraph 1.0.
Your concrete problem between these two versions is that the Gryo MessageSerializer that you are using with Gremlin Console 3.4.8 is not supported any more in JanusGraph 1.0. This problem should however go away when you use Gremlin Console 3.6 as that also does not use Gryo any more as a message serializer.
Also note that JanusGraph 1.0.0-rc1 is a release candidate for the upcoming 1.0.0 release. This means that this version is not meant to be used in production, but only to try out the upcoming release. You can of course still use it as you like, but you should expect some rough edges.
I am trying to run the example grakn migration "phone_calls" (using python and JSON files).
Before reaching there, I need to load the schema, but I am having trouble with getting the schema loaded, as shown here: https://dev.grakn.ai/docs/examples/phone-calls-schema
System:
-Mac OS 10.15
-grakn-core 1.8.3
-python 3.7.3
The grakn server is started. I checked and the 48555 TCP port is open, so I don't think there is any firewall issue. The schema file is in the same folder (phone_calls) as where the json data files is, for the next step. I am using a virtual environment. The error is below:
(project1_env) (base) tiffanytoor1#MacBook-Pro-2 onco % grakn server start
Storage is already running
Grakn Core Server is already running
(project1_env) (base) tiffanytoor1#MacBook-Pro-2 onco % grakn console --keyspace phone_calls --file phone_calls/schema.gql
Unable to create connection to Grakn instance at localhost:48555
Cause: io.grpc.StatusRuntimeException
UNKNOWN: Could not reach any contact point, make sure you've provided valid addresses (showing first 1, use getErrors() for more: Node(endPoint=/127.0.0.1:9042, hostId=null, hashCode=5f59fd46): com.datastax.oss.driver.api.core.connection.ConnectionInitException: [JanusGraph Session|control|connecting...] init query OPTIONS: error writing ). Please check server logs for the stack trace.
I would appreciate any help! Thanks!
Nevermind -- I found the solution, in case any one else runs into a similar problem. The server configuration file needs to be edited: point the data directory to your project data files (here: the phone_calls data files) & change the server IP address to your own.
I'm having trouble getting R to work on SQL Server 2017 on one server (I've successfully installed it on about 8 other servers). I've already installed that latest cumulative update.
When I execute a stored procedure that runs a simple hello world R script, I can see that LaunchPad.exe and rterm.exe are both running. After 60 seconds, however, I get the following error:
Msg 39012, Level 16, State 1, Line 0
Unable to communicate with the runtime for 'R' script. Please check the requirements of 'R' runtime.
STDERR message(s) from external script: Fatal error: creation of tmpfile failed -- set TMPDIR suitably?
This is the script that fails:
EXEC sp_execute_external_script
#language =N'R', #script=N'print("hello")';
Any ideas on what I need to do to resolve this error?
The problem was that Named Pipes wasn't enabled for SQL Server. Enabling that, and restarting the services solved my issue.
My assumption is that you applied the CU after the installation of Machine Learning Services? If so, the CU somehow messes up the folder permissions.
I wrote a blog post about how to fix it here. The blog post is about CU7, but it should apply to any CU.
I do not guarantee that it works, as I have seen other issues when the ML Services stop working, for those cases what fixes it is to do a repair of the SQL installation.
I am using libzdb - Database Connection Pool Library with sqlite database. I am getting following exception :
Failed to start connection pool - database protocol 'sqlite' not supported
After ConnectionPool_start() - it goes in static int _fillPool(T p), in that it is getting falied at above statement
Connection_T con = Connection_new(P, &P->error);
My connection url is as follows :
sqlite:///home/ZDB_TESTING/zdb-test/testDb.db
Kindly help me with this problem.
This means that the SQLite library is not compiled into the libzdb library. If installing from a distribution, make sure that you select libzdb built with SQLite. If you built libzdb yourself from source, after you run ./configure make sure the output says, SQLite3: ENABLED. Otherwise you need to install SQLite on your system first.
I'm using the RPostgreSQL 0.4 library (compiled on R 2.15.3) on R 2.15.2 under Windows 7 64-bit to interface to PostgreSQL. This works fine when connecting to my PostgreSQL databases on localhost. I'm trying to get my R code to run with a remote PostgreSQL database on Heroku. I can connect to Heroku's PostgreSQL database from the psql command shell on my machine, and it connects without a problem. I get the message:
psql (9.2.3, server 9.1.9)
WARNING: psql version 9.2, server version 9.1.
Some psql features might not work.
WARNING: Console code page (437) differs from Windows code page (1252)
8-bit characters might not work correctly. See psql reference
page "Notes for Windows users" for details.
SSL connection (cipher: DHE-RSA-AES256-SHA, bits: 256)
Clearly, psql uses SSL to connect. When I try to connect using the RPostgreSQL library routine dbConnect(), however, supplying exactly the same credentials using dname=, host=, port=, user=, password=, the connection fails with the complaint:
Error in postgresqlNewConnection(drv, ...) :
RS-DBI driver: (could not connect <user>#<hostname> on dbname <dbname>)
Calls: source ... .valueClassTest -> is -> is -> postgresqlNewConnection -> .Call
Execution halted
I know that Heroku insists on an SSL connection if you want to access their database remotely, so it seems likely that the R interface routine dbConnect() isn't trying SSL. Is there something else that I can do to get a remote connection from R to PostgreSQL on Heroku to work?
To get the JDBC URL for your heroku instance:
Get your hostname, username and password using [pg:credentials].
Your jdbc URL is going to be:
jdbc:postgresql://[hostname]/[database]?user=[user]&password=[password]&ssl=true&sslfactory=org.postgresql.ssl.NonValidatingFactory
Proceed as you would normally with JDBC.
Apparently there is a way using RJDBC. See:
http://ryepup.unwashedmeme.com/blog/2010/11/17/working-with-r-postgresql-ssl-and-mssql/
Please note that in order to connect to Heroku database with JDBC externally, it is important to set the sslfactory parameter as well. Hope Heroku team goes through it and modifies their documentation.
String dbUri = "jdbc:postgresql://ec2-54-243-202-174.compute-1.amazonaws.com:5432/**xxxxxxx**";
Properties props = new Properties();
props.setProperty("user", "**xxxxx**");
props.setProperty("password", "**xxxxx**");
props.setProperty("ssl", "true");//ssl to be set true
props.setProperty("sslfactory", "org.postgresql.ssl.NonValidatingFactory");// sslfactory to be set as shown above
Connection c=DriverManager.getConnection(dbUri,props);
See answer to related Q at https://stackoverflow.com/a/38942581. The suggestion of using RPostgres (https://github.com/rstats-db/RPostgres) instead of RPostgreSQL resolved this same issue for me.