聊聊PowerJob的CleanService

本文主要研究一下PowerJob的CleanService

CleanService@Slf4j@Servicepublic class CleanService {

private final DFsService dFsService;

private final InstanceInfoRepository instanceInfoRepository;

private final WorkflowInstanceInfoRepository workflowInstanceInfoRepository;

private final WorkflowNodeInfoRepository workflowNodeInfoRepository;

private final LockService lockService;

private final int instanceInfoRetentionDay;

private final int localContainerRetentionDay;

private final int remoteContainerRetentionDay;

private static final int TEMPORARY_RETENTION_DAY = 3;

/**
 * 每天凌晨3点定时清理
 */
private static final String CLEAN_TIME_EXPRESSION = "0 0 3 * * ?";

private static final String HISTORY_DELETE_LOCK = "history_delete_lock";

public CleanService(DFsService dFsService, InstanceInfoRepository instanceInfoRepository, WorkflowInstanceInfoRepository workflowInstanceInfoRepository,
                    WorkflowNodeInfoRepository workflowNodeInfoRepository, LockService lockService,
                    @Value("${oms.instanceinfo.retention}") int instanceInfoRetentionDay,
                    @Value("${oms.container.retention.local}") int localContainerRetentionDay,
                    @Value("${oms.container.retention.remote}") int remoteContainerRetentionDay) {
    this.dFsService = dFsService;
    this.instanceInfoRepository = instanceInfoRepository;
    this.workflowInstanceInfoRepository = workflowInstanceInfoRepository;
    this.workflowNodeInfoRepository = workflowNodeInfoRepository;
    this.lockService = lockService;
    this.instanceInfoRetentionDay = instanceInfoRetentionDay;
    this.localContainerRetentionDay = localContainerRetentionDay;
    this.remoteContainerRetentionDay = remoteContainerRetentionDay;
}

//......

}

CleanService提供了timingClean、cleanLocal方法timingClean@Async(PJThreadPool.TIMING_POOL)@Scheduled(cron = CLEAN_TIME_EXPRESSION)public void timingClean() {

    // 释放本地缓存
    WorkerClusterManagerService.cleanUp();

    // 释放磁盘空间
    cleanLocal(OmsFileUtils.genLogDirPath(), instanceInfoRetentionDay);
    cleanLocal(OmsFileUtils.genContainerJarPath(), localContainerRetentionDay);
    cleanLocal(OmsFileUtils.genTemporaryPath(), TEMPORARY_RETENTION_DAY);

    // 删除数据库历史的数据
    cleanByOneServer();
}

timingClean先执行WorkerClusterManagerService.cleanUp()释放本地缓存,之后通过cleanLocal释放本地磁盘空间,最后执行cleanByOneServer删除历史数据cleanLocal@VisibleForTestingpublic void cleanLocal(String path, int day) {if (day < 0) {log.info("[CleanService] won't clean up {} because of offset day <= 0.", path);return;}

    Stopwatch stopwatch = Stopwatch.createStarted();
    File dir = new File(path);
    if (!dir.exists()) {
        return;
    }
    File[] logFiles = dir.listFiles();
    if (logFiles == null || logFiles.length == 0) {
        return;
    }

    // 计算最大偏移量
    long maxOffset = day * 24 * 60 * 60 * 1000L;

    for (File f : logFiles) {
        long offset = System.currentTimeMillis() - f.lastModified();
        if (offset >= maxOffset) {
            if (!f.delete()) {
                log.warn("[CleanService] delete file({}) failed.", f.getName());
            }else {
                log.info("[CleanService] delete file({}) successfully.", f.getName());
            }
        }
    }
    log.info("[CleanService] clean {} successfully, using {}.", path, stopwatch.stop());
}

cleanByOneServer

    private void cleanByOneServer() {
        // 只要第一个server抢到锁其他server就会返回,所以锁10分钟应该足够了
        boolean lock = lockService.tryLock(HISTORY_DELETE_LOCK, 10 * 60 * 1000L);
        if (!lock) {
            log.info("[CleanService] clean job is already running, just return.");
            return;
        }
        try {
            // 删除数据库运行记录
            cleanInstanceLog();
            cleanWorkflowInstanceLog();
            // 删除无用节点
            cleanWorkflowNodeInfo();
            // 删除 GridFS 过期文件
            cleanRemote(Constants.LOG_BUCKET, instanceInfoRetentionDay);
            cleanRemote(Constants.CONTAINER_BUCKET, remoteContainerRetentionDay);
        } finally {
            lockService.unlock(HISTORY_DELETE_LOCK);
        }
    }
cleanByOneServer先加锁,然后执行cleanInstanceLog、cleanWorkflowInstanceLog、cleanWorkflowNodeInfo等

小结

PowerJob的CleanService提供了timingClean、cleanLocal方法,其中timingClean先执行WorkerClusterManagerService.cleanUp()释放本地缓存,之后通过cleanLocal释放本地磁盘空间,最后执行cleanByOneServer删除历史数据;cleanLocal会删除指定目录中lastModified距离当前时间大于等于1天的文件。

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