Examples with SelectProcessListener com.alibaba.otter.shared.arbitrate.impl.setl.rpc.monitor.SelectProcessListener used on opensource projects

Example 1 with SelectProcessListener

use of com.alibaba.otter.shared.arbitrate.impl.setl.rpc.monitor.SelectProcessListener in project otter by alibaba.

the class SelectRpcArbitrateEvent method await.

public EtlEventData await(Long pipelineId) throws InterruptedException {
    Assert.notNull(pipelineId);
    PermitMonitor permitMonitor = ArbitrateFactory.getInstance(pipelineId, PermitMonitor.class);
    // 阻塞等待授权
    permitMonitor.waitForPermit();
    SelectProcessListener selectProcessListener = ArbitrateFactory.getInstance(pipelineId, SelectProcessListener.class);
    // 符合条件的processId
    Long processId = selectProcessListener.waitForProcess();
    ChannelStatus status = permitMonitor.getChannelPermit();
    if (status.isStart()) {
        // 即时查询一下当前的状态，状态随时可能会变
        try {
            EtlEventData eventData = new EtlEventData();
            eventData.setPipelineId(pipelineId);
            eventData.setProcessId(processId);
            // 返回当前时间
            eventData.setStartTime(new Date().getTime());
            // 获取下一个处理节点信息
            Node node = LoadBalanceFactory.getNextExtractNode(pipelineId);
            if (node == null) {
                // terminEvent.single(termin);
                throw new ArbitrateException("Select_single", "no next node");
            } else {
                eventData.setNextNid(node.getId());
                // 标记为已使用
                markUsed(eventData);
                // 只有这一条路返回
                return eventData;
            }
        } catch (ZkNoNodeException e) {
            logger.error("pipeline[{}] processId[{}] is invalid , retry again", pipelineId, processId);
            // /出现节点不存在，说明出现了error情况,递归调用重新获取一次
            return await(pipelineId);
        } catch (ZkException e) {
            throw new ArbitrateException("Select_await", e.getMessage(), e);
        }
    } else {
        logger.warn("pipelineId[{}] select ignore processId[{}] by status[{}]", new Object[] { pipelineId, processId, status });
        // add by ljh 2013-02-01
        // 遇到一个bug:
        // a. 某台机器发起了一个RESTART指令，然后开始删除process列表
        // b. 此时另一个台机器(select工作节点)，并没有收到PAUSE的推送，导致还会再创建一个process节点
        // c. 后续收到PAUSE指令后，丢弃了processId，就出现了unused的processId
        // 这里删除了，要考虑一个问题，就是和restart指令在并行删除同一个processId时的并发考虑，目前来看没问题
        String path = StagePathUtils.getProcess(pipelineId, processId);
        // 忽略删除失败
        zookeeper.delete(path);
        // 递归调用
        return await(pipelineId);
    }
}