neo4j and max open files

Question

I'm using neo4j 1.8M06 on ubuntu. When I start it, I get this warning: ``` WARNING: Max 1024 open files allowed, minimum of 40 000 recommended. ``` what does it mean? If it is required, how can I adjust this setting? I've seen this thread on the issue but still could not understand it.

Accepted Answer

It means that you can open only '1024'(default) files for writing. But `NEO4J` recommends this value to be `40K`. This can be achieved with the fix as described below.

Edit `/etc/security/limits.conf` and add these two lines:

```
root   soft    nofile  40000
root   hard    nofile  40000
```

The neo4j recommends "neo4j" in place of "root" here. That won't work.

You also need to edit `/etc/pam.d/common-session*` and add the following line to the end:

```
session required pam_limits.so
```

And yes, finally you've to restart NEO4J.

```
sudo service neo4j-service restart
```

Reference: NEO4J server setup

neo4j and max open files

Solution

Problem