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From "Arthur Naseef (JIRA)" <>
Subject [jira] [Created] (AMQ-3301) LockFile in-jvm check is not thread-safe
Date Fri, 29 Apr 2011 17:47:03 GMT
LockFile in-jvm check is not thread-safe

                 Key: AMQ-3301
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.4.2
            Reporter: Arthur Naseef
            Priority: Minor

kahadb/src/main/java/org/apache/kahadb/util/ adds in-JVM locking to Channel.tryLock()
using system properties.  However, there is time between the read-and-check for an existing
lock and setting a new lock.

I found this problem while running multiple brokers in a single JVM for diagnostic purposes
with two brokers using a shared directory to simlute a production H/A environment.

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