Highly Scalable Java / Bugs / #4 Legal series of updates corrupts map

#4 Legal series of updates corrupts map

Status: closed-fixed

Owner: Cliff Click

Labels: None

Priority: 9

Updated: 2009-08-11

Created: 2009-06-22

Creator: Nick Reeves

Private: No

A valid series of updates leads to the NonBlockingHashMap getting corrupted. I have boiled down a piece of my code (attached) which essentially consists of using a NonBlockingHashMap to track counts for given keys to a simple failure case.

The code works fine with ConcurrentHashMap and only depends on basic features of the ConcurrentMap interface which NonBlockingHashMap should support.

My Java version is the latest Sun Java 6 JDK - Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
My CPU is Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
My OS is Ubuntu 9.04 32 bit

Discussion

Nick Reeves - 2009-06-22

Bug.java

If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

Cliff Click - 2009-06-22

priority: 5 --> 9

assigned_to: nobody --> cliffclick
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

Cliff Click - 2009-06-22

Repro'd on my core2 - with 1 Integer and 2 Threads and the JVM in -Xint mode.
Cliff

If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

Cliff Click - 2009-08-11

status: open --> closed-fixed
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

Cliff Click - 2009-08-11

Fix with 1.1.2
Thanks for the nice bug report.

Cliff

If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

Legal series of updates corrupts map

Group

Searches

Help

#4 Legal series of updates corrupts map

Discussion