Slowing of janusgraph


Hi, i've three janusgraph (0.5.3) servers pointing to same bigTable with same configurations mentioned below. 

I'm using ConfigurationManagementGraph, below is the properties file





cache.db-cache = true
cache.db-cache-clean-wait = 20
cache.db-cache-time = 180000
cache.db-cache-size = 0.5


And gremlin-server.yaml file looks like this

port: 8182
scriptEvaluationTimeout: 100000
channelizer: org.janusgraph.channelizers.JanusGraphWebSocketChannelizer
graphs: {
  graph: conf/,
  ConfigurationManagementGraph: conf/
scriptEngines: {
  gremlin-groovy: {
    plugins: { org.janusgraph.graphdb.tinkerpop.plugin.JanusGraphGremlinPlugin: {},
               org.apache.tinkerpop.gremlin.server.jsr223.GremlinServerGremlinPlugin: {},
               org.apache.tinkerpop.gremlin.tinkergraph.jsr223.TinkerGraphGremlinPlugin: {},
               org.apache.tinkerpop.gremlin.jsr223.ImportGremlinPlugin: {classImports: [java.lang.Math], methodImports: [java.lang.Math#*]},
               org.apache.tinkerpop.gremlin.jsr223.ScriptFileGremlinPlugin: {files: [scripts/empty-sample.groovy]}


All the servers are sharing the same configurations. Now i've setup a nginx also on top of these servers. So, when I've to create a graph I create a connection first with nginx and nginx connects with the most available janusgraph server and that server creates a graph for me and stores it in the bigTable. 
I can now access this graph from any of the three servers.

Till now everything is working as expected.

Issue1:  Slowing of Servers

everyday I generate a new graph with around 150K vertex and 250K edges. For the first time servers generate the graph but later on it slows down the execution and at one moment it stops completely. It wont process anything it, gets stuck in between and don't take any request. So to solve this i've to restart the servers everytime. Which leads to second issue

Issue2: Deleting of graphs

Like when servers are running (all of them). In that time if a graph is created then I can also delete it. But the moment i restart any of the server then i'm not able to delete the graph, the server which get restarted continuously throws error "Table Not Found". So to resolve this too, I've to stop all the servers first and delete all the graph from bigtable then restart the servers again. But again after first graph creation by all the servers, it leads to Issue1 again.

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