The CMS collector uses one or more garbage collector threads that run simultaneously with the appliion threads with the goal of completing the collection of the tenured generation before it becomes full. As described previously, in normal operation, the CMS collector does most of its tracing and sweeping work with the application threads still running, so only brief pauses are seen by the application threads. However, if the CMS collector is unable to finish reclaiming the unreachable objects before the tenured generation fills up, or if an allocation cannot be satisfied with the available free space blocks in the tenured generation, then the application is paused and the collection is completed with all the application threads stopped. The inability to complete a collection concurrently is referred to as concurrent mode failure and indicates the need to adjust the CMS collector parameters. If a concurrent collection is interrupted by an explicit garbage collection (System.gc()) or for a garbage collection needed to prov e information for diagnostic tools, then a concurrent mode interruption is reported.
，这个失败表明我们需要调整CMS收集器的 。如果并发回收被显示调用(System.gc()) 或者为了给诊断工具提供信息而发生中断，则会报告并发模式中断。
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