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jbmusso / gremlin-javascript

JavaScript tools for graph processing in Node.js and the browser inspired by the Apache TinkerPop API
MIT License
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Traversal object 'g' not initialized #46

Closed joebernard closed 8 years ago

joebernard commented 8 years ago

I'm not sure if this is related to gremlin-javascript, but this issue started right after I updated to the latest version. g and graph are no longer available to my calls by default. I'm still able to connect, but need to fully instantiate these objects on each call now:

g = graph.traversal(standard());
graph = TitanFactory.open("conf/gremlin-server/dynamodb.properties");

I found issue #21, but so far haven't been able to fix the problem. The contents of gremlin-server.yaml are attached, but I've made no recent updates to it.

I will note that when operating on the console (bin/gremlin.sh), I've always needed to manually instantiate these objects. However up until recently gremlin-javascriptalways provided a client with g and graph available. I'm not sure what changed to cause this.

Gremlin version:

gremlin> Gremlin.version()
==>3.0.1-incubating

Output when starting gremlin.sh:

$ bin/gremlin.sh

         \,,,/
         (o o)
-----oOOo-(3)-oOOo-----
plugin activated: aurelius.titan
plugin activated: tinkerpop.server
plugin activated: tinkerpop.utilities
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/local/packages/dynamodb-titan100-storage-backend-1.0.0-hadoop1/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/local/packages/dynamodb-titan100-storage-backend-1.0.0-hadoop1/lib/logback-classic-1.1.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/local/packages/dynamodb-titan100-storage-backend-1.0.0-hadoop1/ext/dynamodb-titan100-storage-backend/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
14:14:10 INFO  org.apache.tinkerpop.gremlin.hadoop.structure.HadoopGraph  - HADOOP_GREMLIN_LIBS is set to: /usr/local/packages/dynamodb-titan100-storage-backend-1.0.0-hadoop1/lib
plugin activated: tinkerpop.hadoop
plugin activated: tinkerpop.tinkergraph
gremlin>

gremlin-server.yaml:

# Copyright 2014-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# Portions copyright Titan: Distributed Graph Database - Copyright 2012 and onwards Aurelius.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
# http://aws.amazon.com/apache2.0
#
# or in the "license" file accompanying this file. This file is distributed
# on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
# express or implied. See the License for the specific language governing
# permissions and limitations under the License.
#
# This file was adapted from the following file:
# https://github.com/thinkaurelius/titan/blob/1.0.0/titan-dist/src/assembly/static/conf/gremlin-server/gremlin-server.yaml
#
host: 0.0.0.0
port: 8182
threadPoolWorker: 1
gremlinPool: 8
scriptEvaluationTimeout: 30000
serializedResponseTimeout: 30000
channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer
graphs: {
  graph: conf/gremlin-server/dynamodb.properties}
plugins:
  - aurelius.titan
scriptEngines: {
  gremlin-groovy: {
    imports: [java.lang.Math],
    staticImports: [java.lang.Math.PI],
    scripts: [scripts/empty-sample.groovy]},
  nashorn: {
      imports: [java.lang.Math],
      staticImports: [java.lang.Math.PI]}}
serializers:
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { useMapperFromGraph: graph }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0, config: { serializeResultToString: true }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0, config: { useMapperFromGraph: graph }}
  - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0, config: { useMapperFromGraph: graph }}
processors:
  - { className: org.apache.tinkerpop.gremlin.server.op.session.SessionOpProcessor, config: { sessionTimeout: 28800000 }}
metrics: {
  consoleReporter: {enabled: false, interval: 180000},
  csvReporter: {enabled: false, interval: 180000, fileName: /tmp/gremlin-server-metrics.csv},
  jmxReporter: {enabled: false},
  slf4jReporter: {enabled: false, interval: 180000},
  gangliaReporter: {enabled: false, interval: 180000, addressingMode: MULTICAST},
  graphiteReporter: {enabled: false, interval: 180000}}
threadPoolBoss: 1
maxInitialLineLength: 4096
maxHeaderSize: 8192
maxChunkSize: 8192
maxContentLength: 65536
maxAccumulationBufferComponents: 1024
resultIterationBatchSize: 64
writeBufferHighWaterMark: 32768
writeBufferHighWaterMark: 65536
ssl: {
  enabled: false}
dmill-bz commented 8 years ago

Is this something you're running locally? Can you by any chance show the gremlin-server output of bin/titan.sh start -v (you'll get a lot of output, the gremlin server part is the final one).

joebernard commented 8 years ago

I've included the output below, but discovered something in the meantime.

When my server (an EC2 instance) initially starts, g and graph are not available to gremlin-javascript. It is only after I stop Titan, then start it using bin/titan.sh start -v, and then try to connect with gremlin-javascript again that g and graph are available.

From the output I can see that g is getting bound after I stop/start Titan. I'm stumped as to why gremlin-javascript isn't seeing these objects until after the titan restart.

0    [main] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - 
         \,,,/
         (o o)
-----oOOo-(3)-oOOo-----

286  [main] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Configuring Gremlin Server from conf/gremlin-server/gremlin-server.yaml
.2081 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_system_properties
2864 [main] INFO  com.thinkaurelius.titan.core.util.ReflectiveConfigOptionLoader  - Loaded and initialized config classes: 12 OK out of 12 attempts in PT0.104S
.3946 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Closing table:v100_system_properties
3951 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Closing table:v100_system_properties
3954 [main] INFO  com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration  - Generated unique-instance-id=ac1f316d3098-ip-172-31-49-1091
3997 [main] INFO  com.thinkaurelius.titan.diskstorage.Backend  - Configuring index [search]
4157 [main] INFO  org.elasticsearch.node  - [Thinker] version[1.5.1], pid[3098], build[5e38401/2015-04-09T13:41:35Z]
4159 [main] INFO  org.elasticsearch.node  - [Thinker] initializing ...
4167 [main] INFO  org.elasticsearch.plugins  - [Thinker] loaded [], sites []
.7128 [main] INFO  org.elasticsearch.node  - [Thinker] initialized
7128 [main] INFO  org.elasticsearch.node  - [Thinker] starting ...
7137 [main] INFO  org.elasticsearch.transport  - [Thinker] bound_address {local[1]}, publish_address {local[1]}
7149 [main] INFO  org.elasticsearch.discovery  - [Thinker] elasticsearch/BTw38bJpRPWNxqfDjPzDkA
7152 [elasticsearch[Thinker][clusterService#updateTask][T#1]] INFO  org.elasticsearch.cluster.service  - [Thinker] master {new [Thinker][BTw38bJpRPWNxqfDjPzDkA][ip-172-31-49-109][local[1]]{local=true}}, removed {[Thinker][xl3xrB7WQneJwk25oFe53g][ip-172-31-49-109][local[1]]{local=true},}, reason: local-disco-initial_connect(master)
7334 [main] INFO  org.elasticsearch.http  - [Thinker] bound_address {inet[/0:0:0:0:0:0:0:0:9201]}, publish_address {inet[/172.31.49.109:9201]}
7334 [main] INFO  org.elasticsearch.node  - [Thinker] started
7881 [elasticsearch[Thinker][clusterService#updateTask][T#1]] INFO  org.elasticsearch.gateway  - [Thinker] recovered [1] indices into cluster_state
...............37886 [main] INFO  com.thinkaurelius.titan.diskstorage.Backend  - Initiated backend operations thread pool of size 2
37887 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_titan_ids
37937 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_edgestore
37958 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_graphindex
37977 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_txlog
38030 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_systemlog
38063 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_system_properties
38256 [main] INFO  com.thinkaurelius.titan.diskstorage.log.kcvs.KCVSLog  - Loaded unidentified ReadMarker start time 2016-04-09T19:11:56.134Z into com.thinkaurelius.titan.diskstorage.log.kcvs.KCVSLog$MessagePuller@14ed7ddf
38257 [main] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Graph [graph] was successfully configured via [conf/gremlin-server/dynamodb.properties].
38257 [main] INFO  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
38812 [main] INFO  org.apache.tinkerpop.gremlin.groovy.engine.ScriptEngines  - Loaded nashorn ScriptEngine
.39602 [main] INFO  org.apache.tinkerpop.gremlin.groovy.engine.ScriptEngines  - Loaded gremlin-groovy ScriptEngine
40901 [main] INFO  org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor  - Initialized gremlin-groovy ScriptEngine with scripts/empty-sample.groovy
40907 [main] INFO  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Initialized GremlinExecutor and configured ScriptEngines.
40914 [main] INFO  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - A GraphTraversalSource is now bound to [g] with graphtraversalsource[standardtitangraph[com.amazon.titan.diskstorage.dynamodb.DynamoDBStoreManager:[127.0.0.1]], standard]
41022 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v1.0+gryo with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0
41022 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v1.0+gryo-stringd with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0
41068 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v1.0+json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0
41071 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0
41193 [gremlin-server-boss-1] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Gremlin Server configured with worker thread pool of 1, gremlin pool of 8 and boss thread pool of 1.
41194 [gremlin-server-boss-1] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Channel started at port 8182.
. OK (connected to 127.0.0.1:8182).
Run gremlin.sh to connect.
[ec2-user@ip-172-31-49-109 dynamodb-titan100-storage-backend-1.0.0-hadoop1]$ 62497 [gremlin-server-worker-1] INFO  org.apache.tinkerpop.gremlin.server.op.OpLoader  - Adding the standard OpProcessor.
62498 [gremlin-server-worker-1] INFO  org.apache.tinkerpop.gremlin.server.op.OpLoader  - Adding the control OpProcessor.
62500 [gremlin-server-worker-1] INFO  org.apache.tinkerpop.gremlin.server.op.OpLoader  - Adding the session OpProcessor.
dmill-bz commented 8 years ago

That does sound weird. Do you have any logs in the logs folder of your titan for those initial launches (that don't seem to populate graph and g)?

joebernard commented 8 years ago

I have a log directory (sibling to bin) that contains

-rw-rw-r--  1 ec2-user ec2-user 242538 Apr  9 21:24 cassandra.log
-rw-rw-r--  1 ec2-user ec2-user      0 Apr  9 18:15 elasticsearch_index_indexing_slowlog.log
-rw-rw-r--  1 ec2-user ec2-user      0 Apr  9 18:15 elasticsearch_index_search_slowlog.log
-rw-rw-r--  1 ec2-user ec2-user   6612 Apr  9 21:24 elasticsearch.log
-rw-rw-r--  1 ec2-user ec2-user 232743 Apr  9 19:12 gremlin-server.log

gremlin-server.log only captured my manual attempt to start the server (showing g is bound). It doesn't seem to capture the initial Titan startup. Is there another location for Titan specific logs? A quick find doesn't seem to reveal any.

dmill-bz commented 8 years ago

Hmm not that I recall. If you're using an image you haven't created on EC2 it's possible that an alternate log dir is being used (or logging is being suppressed). Try having a look inside /etc/init.d/ or /etc/init/ for any titan startup script (I'm assuming Debian, I don't know about other distros).

joebernard commented 8 years ago

You were right, the AWS image specified a custom log file. Found it in /var/log/gremlin-server. There is an error when it attempts to init graph. It seems to indicate the graph is already open, but I'm not sure how that could be. This was captured after a server reboot, and is the only Titan server I'm using. Here are the contents:

0    [main] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - 
         \,,,/
         (o o)
-----oOOo-(3)-oOOo-----

266  [main] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Configuring Gremlin Server from /usr/local/packages/dynamodb-titan100-storage-backend-1.0.0-hadoop1/conf/gremlin-server/gremlin-server.yaml
2220 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_system_properties
3075 [main] INFO  com.thinkaurelius.titan.core.util.ReflectiveConfigOptionLoader  - Loaded and initialized config classes: 12 OK out of 12 attempts in PT0.098S
4151 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Closing table:v100_system_properties
4155 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Closing table:v100_system_properties
4158 [main] INFO  com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration  - Generated unique-instance-id=ac1f316d2400-ip-172-31-49-1091
4197 [main] INFO  com.thinkaurelius.titan.diskstorage.Backend  - Configuring index [search]
4400 [main] INFO  org.elasticsearch.node  - [Atom Bob] version[1.5.1], pid[2400], build[5e38401/2015-04-09T13:41:35Z]
4400 [main] INFO  org.elasticsearch.node  - [Atom Bob] initializing ...
4416 [main] INFO  org.elasticsearch.plugins  - [Atom Bob] loaded [], sites []
7331 [main] INFO  org.elasticsearch.node  - [Atom Bob] initialized
7331 [main] INFO  org.elasticsearch.node  - [Atom Bob] starting ...
7336 [main] INFO  org.elasticsearch.transport  - [Atom Bob] bound_address {local[1]}, publish_address {local[1]}
7346 [main] INFO  org.elasticsearch.discovery  - [Atom Bob] elasticsearch/9K4-3iseRpSYqVExWE4J9A
7348 [elasticsearch[Atom Bob][clusterService#updateTask][T#1]] INFO  org.elasticsearch.cluster.service  - [Atom Bob] master {new [Atom Bob][9K4-3iseRpSYqVExWE4J9A][ip-172-31-49-109][local[1]]{local=true}}, removed {[Atom Bob][E0dnS2NRS7C3Jz-vb_dirA][ip-172-31-49-109][local[1]]{local=true},}, reason: local-disco-initial_connect(master)
7489 [main] INFO  org.elasticsearch.http  - [Atom Bob] bound_address {inet[/0:0:0:0:0:0:0:0:9200]}, publish_address {inet[/172.31.49.109:9200]}
7490 [main] INFO  org.elasticsearch.node  - [Atom Bob] started
8045 [elasticsearch[Atom Bob][clusterService#updateTask][T#1]] INFO  org.elasticsearch.gateway  - [Atom Bob] recovered [1] indices into cluster_state
38049 [main] INFO  com.thinkaurelius.titan.diskstorage.Backend  - Initiated backend operations thread pool of size 2
38049 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_titan_ids
38156 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_edgestore
38169 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_graphindex
38187 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_txlog
38220 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_systemlog
38246 [main] INFO  com.amazon.titan.diskstorage.dynamodb.AbstractDynamoDBStore  - Entering ensureStore table:v100_system_properties
38307 [main] WARN  org.apache.tinkerpop.gremlin.server.GremlinServer  - Graph [graph] configured at [conf/gremlin-server/dynamodb.properties] could not be instantiated and will not be available in Gremlin Server.  GraphFactory message: GraphFactory could not instantiate this Graph implementation [class com.thinkaurelius.titan.core.TitanFactory]
java.lang.RuntimeException: GraphFactory could not instantiate this Graph implementation [class com.thinkaurelius.titan.core.TitanFactory]
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:82)
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:70)
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:104)
    at org.apache.tinkerpop.gremlin.server.GraphManager.lambda$new$27(GraphManager.java:50)
    at java.util.LinkedHashMap$LinkedEntrySet.forEach(LinkedHashMap.java:663)
    at org.apache.tinkerpop.gremlin.server.GraphManager.<init>(GraphManager.java:48)
    at org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor.<init>(ServerGremlinExecutor.java:94)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.<init>(GremlinServer.java:88)
    at org.apache.tinkerpop.gremlin.server.GremlinServer.main(GremlinServer.java:290)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tinkerpop.gremlin.structure.util.GraphFactory.open(GraphFactory.java:78)
    ... 8 more
Caused by: com.thinkaurelius.titan.core.TitanException: A Titan graph with the same instance id [ac1f316d2400-ip-172-31-49-1091] is already open. Might required forced shutdown.
    at com.thinkaurelius.titan.graphdb.database.StandardTitanGraph.<init>(StandardTitanGraph.java:146)
    at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:94)
    at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:74)
    ... 13 more
38312 [main] INFO  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
38908 [main] INFO  org.apache.tinkerpop.gremlin.groovy.engine.ScriptEngines  - Loaded nashorn ScriptEngine
39606 [main] INFO  org.apache.tinkerpop.gremlin.groovy.engine.ScriptEngines  - Loaded gremlin-groovy ScriptEngine
40778 [main] WARN  org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor  - Could not initialize gremlin-groovy ScriptEngine with scripts/empty-sample.groovy as script could not be evaluated - javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: graph for class: Script1
40778 [main] INFO  org.apache.tinkerpop.gremlin.server.util.ServerGremlinExecutor  - Initialized GremlinExecutor and configured ScriptEngines.
40878 [main] WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Could not instantiate configured serializer class - org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0 - it will not be available. There is no graph named [graph] configured to be used in the useMapperFromGraph setting
40880 [main] INFO  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Configured application/vnd.gremlin-v1.0+gryo-stringd with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV1d0
40923 [main] WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Could not instantiate configured serializer class - org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerGremlinV1d0 - it will not be available. There is no graph named [graph] configured to be used in the useMapperFromGraph setting
40924 [main] WARN  org.apache.tinkerpop.gremlin.server.AbstractChannelizer  - Could not instantiate configured serializer class - org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV1d0 - it will not be available. There is no graph named [graph] configured to be used in the useMapperFromGraph setting
41026 [gremlin-server-boss-1] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Gremlin Server configured with worker thread pool of 1, gremlin pool of 8 and boss thread pool of 1.
41026 [gremlin-server-boss-1] INFO  org.apache.tinkerpop.gremlin.server.GremlinServer  - Channel started at port 8182.
joebernard commented 8 years ago

For reference I'm including the contents of gremlin-server-service.sh which is the startup script for Titan (provided on the official AWS image for Titan).

# Init script for Gremlin Server so it automatically starts/stops with the machine.
#
# To install:
# 1)  Add a symlink to this file in /etc/init.d/ under the name you'd like to see the service
#     For example, to name the service "gremlin-server": ln -s /usr/local/packages/dynamodb-titan100-storage-backend-1.0.0-hadoop1/bin/gremlin-server-service.sh /etc/init.d/gremlin-server
# 2a) If you're running RH: chkconfig --add gremlin-server
# 2b) If you're running Ubuntu: update-rc.d gremlin-server defaults
#
# You have to SET the Gremlin Server installation directory here:
GREMLIN_SERVER_DIR="/usr/local/packages/dynamodb-titan100-storage-backend-1.0.0-hadoop1"
GREMLIN_SERVER_LOG_DIR="/var/log/gremlin-server"
# Specify the user to run Gremlin Server as:
GREMLIN_SERVER_USER="ec2-user"
# JAVA_OPTIONS only gets used on start
JAVA_OPTIONS="-server -Xms128m -Xmx512m -Dtitan.logdir=$GREMLIN_SERVER_LOG_DIR"

usage() {
    echo "Usage: `basename $0`: <start|stop|status>"
    exit 1
}

start() {
    status
    if [ $PID -gt 0 ]
    then
        echo "Gremlin Server has already been started. PID: $PID"
        return $PID
    fi
    export JAVA_OPTIONS
    echo "Starting Gremlin Server..."
    su -c "cd \"$GREMLIN_SERVER_DIR\"; /usr/bin/nohup ./bin/gremlin-server.sh ${GREMLIN_SERVER_DIR}/conf/gremlin-server/gremlin-server.yaml 1>$GREMLIN_SERVER_LOG_DIR/service.log 2>$GREMLIN_SERVER_LOG_DIR/service.err &" $GREMLIN_SERVER_USER
}

stop() {
    status
    if [ $PID -eq 0 ]
    then
        echo "Gremlin Server has already been stopped."
        return 0
    fi
    echo "Stopping Gremlin Server..."
    su -c "kill -9 ${PID}" $GREMLIN_SERVER_USER
}

status() {
    PID=`ps -ef | grep $GREMLIN_SERVER_USER | grep java | grep GremlinServer | grep -v grep | awk '{print $2}'`
    if [ "x$PID" = "x" ]
    then
        PID=0
    fi

    # if PID is greater than 0 then Gremlin Server is running, else it is not
    return $PID
}

if [ "x$1" = "xstart" ]
then
    start
    exit 0
fi

if [ "x$1" = "xstop" ]
then
    stop
    exit 0
fi

if [ "x$1" = "xstatus" ]
then
    status
    if [ $PID -gt 0 ]
    then
        echo "Gremlin Server is running with PID: $PID"
    else
        echo "Gremlin Server is NOT running"
    fi
    exit $PID
fi

usage
dmill-bz commented 8 years ago

I need to head out so I'll give this some more thought. But I don't think it's an issue with the init script. A shot in the dark here would be to consider that you may have a lingering PID/lock file. This would be weird when using a pre-made instance but it could be a sign that titan didn't shutdown properly when the instance's state was last saved. It should be possible to test this theory. I haven't used amazon's services in a very long time but perhaps try to reboot titan to get the graph back up like you demonstrated earlier. Then shut Titan down safely and save your image. Cross your fingers when you boot the image back up :)

joebernard commented 8 years ago

I'll try tomorrow. In the meantime I've opened an issue with the AWS project. Will report back. Thanks so much for all your help.

joebernard commented 8 years ago

I'm going to close this since it isn't an issue with gremlin-javascript. For anyone interested, follow the aforementioned AWS ticket.