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Vert.x 1.3.1.final SockJS memory leak reproduction

This gist contains code to reproduce a memory leak in Vert.x when a SockJS client fails to disconnect cleanly. Also provided is a heap dump generated by the JVM on my laptop.

overview

Vert.x has a memory leak in its SockJS implementation. If a SockJS client connects, subscribes to EventBus messages (via the EventBus bridge), and then disappears without closing its connection, Vert.x will continue to accumulate pending writes until memory is exhausted. I have reproduced this with multiple transports. This scenario can happen in the real world if the client has a flaky network connection, or perhaps if the user merely puts their laptop to sleep.

requirements

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#! /bin/bash

#
# requires: fpm, python-pip
#     gem install fpm
#     apt-get install python-pip
#

set -e

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moved to blalor/package-manager-rosetta-stone!

blalor

This is sample configuration to help you build a Vert.x "mod" archive. Put mod.xml into your project as src/main/assembly/mod.xml and the include the maven-assembly-plugin plugin config in your pom.xml. Also create src/main/resources/mod.json. When you run mvn package you will get target/${artifactId}-${version}-mod.zip which will contain all of your dependencies in ${groupId}.${artifactId}-v${version}/lib and ${groupId}.${artifactId}-v${version}/mod.json. Your application code and resources will be in ${groupId}.${artifactId}-v${version}/lib/${artifactId}-${version}.jar.

blalor

function RaphPoint(paper, lat, lon) {
    var that = this;
    
    that._paper = paper;
    that._lat = lat;
    that._lon = lon;
    that._map = null; // provided via map()
    
    that._el = that._paper.circle(0,0,5)
        .attr("fill", "#223fa3")

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on your computer

Make a note of your computer's IP address; your_ip.

Record the full path to your working copy, the parent of the .git directory; repo_path.

1. cd <repo_path>
2. touch .git/git-daemon-export-ok

blalor

#include "soft_serial.h"

#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>

#include <stdio.h>
#include <stdbool.h>

static volatile uint8_t data_byte;

blalor

import org.springframework.jdbc.core.simple.SimpleJdbcDaoSupport;
import org.springframework.jdbc.core.simple.ParameterizedRowMapper;
import org.springframework.dao.DataIntegrityViolationException;

import java.sql.ResultSet;
import java.sql.SQLException;

import java.util.List;
import java.util.Date;

blalor

#!/bin/bash

set -e

MCU="$1"

cat <<-'EOF' > foo.c
#include <avr/pgmspace.h>
unsigned char mydata[64][16] PROGMEM =
{

blalor

#!/bin/bash

# http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=792113#792113
# ".data+.bss+.noinit is the initial RAM allocation."

# AVR Memory Usage
# ----------------
# Device: atmega328p
# 
# Program:   12580 bytes (38.4% Full)