import org.apache.cassandra.concurrent.DebuggableScheduledThreadPoolExecutor; //导入依赖的package包/类
private IndexSummaryManager()
{
    executor = new DebuggableScheduledThreadPoolExecutor(1, "IndexSummaryManager", Thread.MIN_PRIORITY);

    long indexSummarySizeInMB = DatabaseDescriptor.getIndexSummaryCapacityInMB();
    int interval = DatabaseDescriptor.getIndexSummaryResizeIntervalInMinutes();
    logger.info("Initializing index summary manager with a memory pool size of {} MB and a resize interval of {} minutes",
                indexSummarySizeInMB, interval);

    setMemoryPoolCapacityInMB(DatabaseDescriptor.getIndexSummaryCapacityInMB());
    setResizeIntervalInMinutes(DatabaseDescriptor.getIndexSummaryResizeIntervalInMinutes());
}
 

import org.apache.cassandra.concurrent.DebuggableScheduledThreadPoolExecutor; //导入依赖的package包/类
public BatchlogManager()
{
    ScheduledThreadPoolExecutor executor = new DebuggableScheduledThreadPoolExecutor("BatchlogTasks");
    executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
    batchlogTasks = executor;
}