Socket issues - neo4j/OS config

[Kevin Eid]

Hi, 

I'm building a log generator app using multithreading and creating nodes and rels from these data. 

I'm having the following issue: 

"I/O exception (java.net.SocketException) caught when processing request: Socket closed"

I'm trying to change the config of my debian VMs (like timeout sockets, ...). 

Do you have any idea how to solve it? Do I need to change the neo4j.properties files or the OS config? 

Thanks in advance for your feedbacks, 

Kevin 

[Michael Hunger]

Kevin,

we need much more detail than that.

Neo4j version

how you interact with it, your stack

your code, what do you send how to Neo4j

full error message

messages.log of Neo4j

Michael

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[Kevin Eid]

I work with neo4j 2.1.6 Community edition. 

I can't post the code but basically I write a dozen of nodes/rels creation queries; and create randomly hundreds of thousands of them. 

I joined erroLog screenshot and messages.log. 

Thanks,

Kevin

[Michael Hunger]

Your messages.log looks like if it you use Neo4j Enterprise in HA / Cluster mode?

There are also exceptions that say that the client closed the connection without reading the full response stream?

What kind of client code do you have (stack, kind of interaction).

Caused by: java.io.IOException: Connection reset by peer

Are you writing to master only?

There are also a lot of other network issues in your log-file, perhaps your network config is not consistent.

e.g.

java.net.NoRouteToHostException: No route to host

Michael

<messages.log><errorLog.PNG>

[Kevin Eid]

Yes I'm using HA/clustering mode and I only write to master. 

I interact with neo4j from Eclipse through the jdbc-neo4j driver. 

I'm also trying to fix the issues with OS config modifying tcp_syn_retries with "echo 6 > /proc/sys/net/ipv4/tcp_syn_retries"; could that help? 

Kevin 

[Kevin Eid]

Another precision, we set up the HA proxy independently from the neo4j community server.

[Michael Hunger]

Don't know.

The JDBC driver is not most efficient yet, I still have to update it to a better implementation,

for testing out issue could you try to use this as interaction?

https://github.com/jexp/neo4j-remoting-cypher

https://github.com/jexp/neo4j-remoting-cypher/blob/master/src/test/java/transaction/CypherTransactionTest.java

Michael

[Kevin Eid]

Thanks, I will!

Kevin