聊聊chronos的pullFromDefaultCFAndPush
序
本文主要研究一下chronos的pullFromDefaultCFAndPush
pullFromDefaultCFAndPush
DDMQ/carrera-chronos/src/main/java/com/xiaojukeji/chronos/services/MqPushService.java
public class MqPushService { //......
public void pullFromDefaultCFAndPush() {
final long seekTimestamp = MetaService.getSeekTimestamp();
final long zkSeekTimestamp = MetaService.getZkSeekTimestamp();
// backup的seekTimestamp不能超过master的seekTimestamp
if (MasterElection.isBackup()) {
if (seekTimestamp >= zkSeekTimestamp) {
LOGGER.debug("backup"s pull from db should stop for seekTimestamp > zkSeekTimestamp, seekTimestamp:{}, zkSeekTimestamp:{}, Thread:{}",
seekTimestamp, zkSeekTimestamp, Thread.currentThread().getName());
try {
TimeUnit.SECONDS.sleep(2);
} catch (InterruptedException e) {
}
return;
}
}
// seekTimestamp不能超过当前时间
final long now = TsUtils.genTS();
if (seekTimestamp > now) {
LOGGER.debug("pull from db should stop for seekTimestamp > now, seekTimestamp:{}, now:{}, Thread:{}",
seekTimestamp, now, round, Thread.currentThread().getName());
try {
TimeUnit.MILLISECONDS.sleep(100);
} catch (InterruptedException e) {
}
return;
}
round++;
final long start = System.currentTimeMillis();
final long diff = start / 1000 - seekTimestamp;
LOGGER.info("pull from db start, seekTimestamp:{}, currTimestamp:{}, diff:{} round:{}",
seekTimestamp, start / 1000, diff, round);
MetricService.putSeekLatency(MasterElection.getState().toString(), diff + 10); // 因为0上传到metric之后不显示
// 迭代出当前 seekTimestamp 下所有数据
int count = 0;
try (RocksIterator it = RDB.newIterator(CFManager.CFH_DEFAULT)) {
for (it.seek(KeyUtils.genSeekKey(seekTimestamp)); it.isValid(); it.next()) {
final String dMsgId = new String(it.key());
final InternalKey internalKey = new InternalKey(dMsgId);
//......
boolean needMetricWriteQpsAfterSplit = false;
// 循环消息需要插入一条新的消息, 如果失效, 则不再插入
if (internalKey.getType() == MsgTypes.LOOP_DELAY.getValue()
|| internalKey.getType() == MsgTypes.LOOP_EXPONENT_DELAY.getValue()) {
final InternalKey nextInternalKey = new InternalKey(internalKey).nextUniqDelayMsgId();
if (!KeyUtils.isInvalidMsg(nextInternalKey)) {
batcher.putToDefaultCF(nextInternalKey.genUniqDelayMsgIdWithSegmentInfoIfHas(), it.value(), null, nextInternalKey, Actions.ADD.getValue());
needMetricWriteQpsAfterSplit = true;
}
}
byte[] bytes = it.value();
if (internalKey.getSegmentNum() > 0) {
try {
OUTPUT.write(it.value());
LOGGER.info("segment merge, dMsgId:{}, value.len:{}, value.acc.len:{}", internalKey.genUniqDelayMsgIdWithSegmentInfoIfHas(), it.value().length, OUTPUT.size());
if (internalKey.getSegmentNum() != (internalKey.getSegmentIndex() - Constants.SEGMENT_INDEX_BASE + 1)) {
continue;
}
bytes = OUTPUT.toByteArray();
OUTPUT.reset();
} catch (IOException e) {
LOGGER.error("error while output.write byte array, msg:{}", e.getMessage(), e);
}
}
// 如果解析不出来, 说明格式有问题, 抛弃掉该条消息, 不阻塞
final InternalValue internalValue = JsonUtils.fromJsonString(bytes, InternalValue.class);
if (internalValue == null) {
continue;
}
//......
count++;
try {
blockingQueue.put(new InternalPair(internalKey, internalValue));
} catch (InterruptedException e) {
LOGGER.error("error while put to blockingQueue, dMsgId:{}", dMsgId);
}
if (count % INTERNAL_PAIR_COUNT == 0) {
sendConcurrent(blockingQueue, round);
}
}
sendConcurrent(blockingQueue, round);
}
needCancelMap.forEach((uniqDelayMsgId, tombstoneKey) -> {
final InternalKey internalKey = new InternalKey(uniqDelayMsgId);
final InternalKey tombstoneInternalKey = new InternalKey(tombstoneKey);
// 残留的循环消息取消需要重新添加进去, 否则会删除不掉
if (internalKey.getType() == MsgTypes.LOOP_DELAY.getValue()
|| internalKey.getType() == MsgTypes.LOOP_EXPONENT_DELAY.getValue()) {
final InternalKey nextTombstoneKey = tombstoneInternalKey.nextUniqDelayMsgId();
final InternalKey nextInternalKey = internalKey.nextUniqDelayMsgId();
if (!KeyUtils.isInvalidMsg(nextTombstoneKey)) {
String topic = needCancelTopicMap.get(uniqDelayMsgId);
batcher.putToDefaultCF(nextTombstoneKey.genUniqDelayMsgId(),
new CancelWrap(nextInternalKey.genUniqDelayMsgId(), topic).toJsonString(),
topic, nextInternalKey, Actions.CANCEL.getValue());
} else {
LOGGER.info("pull from db succ cancel message of tombstone key, tombstone dMsgId:{}",
nextTombstoneKey.genUniqDelayMsgId());
}
}
});
batcher.flush();
needCancelMap.clear();
needCancelTopicMap.clear();
// 更新offset
MetaService.nextSeekTimestamp();
LOGGER.info("pull from db finish push, pushCost:{}ms, count:{}, seekTimestamp:{}, round:{}",
System.currentTimeMillis() - start, count, seekTimestamp, round);
}
//......
}
- pullFromDefaultCFAndPush方法先从metaService获取seekTimestamp及zkSeekTimestamp，若seekTimestamp超过当前时间则提前返回；之后从RDB.newIterator(CFManager.CFH_DEFAULT)获取RocksIterator进行遍历，读取dMsgId构造internalKey，若其type是LOOP_DELAY或者LOOP_EXPONENT_DELAY则通过batcher.putToDefaultCF重新放入rocksdb；之后读取it.value()构造internalValue，紧接着构造InternalPair放入到blockingQueue，之后在
count % INTERNAL_PAIR_COUNT == 0时执行sendConcurrent，在循环结束之后再执行一次sendConcurrent；最后更新MetaService.nextSeekTimestamp()
sendConcurrent
DDMQ/carrera-chronos/src/main/java/com/xiaojukeji/chronos/services/MqPushService.java
public class MqPushService { //......
private void sendConcurrent(final BlockingQueue<InternalPair> blockingQueue, final long round) {
if (blockingQueue.size() == 0) {
LOGGER.info("pull from db sendConcurrent start, return for no message to send, round:{}", round);
return;
}
final long sendCount = blockingQueue.size();
LOGGER.info("pull from db sendConcurrent start, send count:{}, round:{}", sendCount, round);
final long start = System.currentTimeMillis();
final CountDownLatch cdl = new CountDownLatch(blockingQueue.size());
InternalPair internalPair;
while ((internalPair = blockingQueue.poll()) != null) {
final InternalPair immutableInternalPair = internalPair;
pushThreadPool.execute(() -> {
while (!send(
immutableInternalPair.getInternalValue().getTopic(),
immutableInternalPair.getInternalValue().getBody().getBytes(Charsets.UTF_8),
immutableInternalPair.getInternalKey(),
immutableInternalPair.getInternalValue().getTags(),
immutableInternalPair.getInternalValue().getProperties(),
false)) {
try {
TimeUnit.MILLISECONDS.sleep(100);
} catch (InterruptedException e) {
}
}
cdl.countDown();
});
}
try {
cdl.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
final long cost = System.currentTimeMillis() - start;
LOGGER.info("pull from db sendConcurrent end, send count:{}, round:{}, cost:{}ms", sendCount, round, cost);
}
//......
}
- sendConcurrent方法会执行blockingQueue.poll()，然后执行send方法
send
DDMQ/carrera-chronos/src/main/java/com/xiaojukeji/chronos/services/MqPushService.java
public class MqPushService { //......
private boolean send(final String topic, final byte[] body, final InternalKey internalKey, final String tags, final Map<String, String> properties,
final boolean direct) {
final long start = System.nanoTime();
final String key = internalKey.genUniqDelayMsgId();
MetricMsgType metricMsgType;
if (internalKey.getType() == MsgTypes.DELAY.getValue()) {
metricMsgType = MetricMsgType.DELAY;
} else if (internalKey.getType() == MsgTypes.LOOP_DELAY.getValue()) {
metricMsgType = MetricMsgType.LOOP_DELAY;
} else {
metricMsgType = MetricMsgType.UNKNOWN;
}
int len = 0;
if (body != null) {
len = body.length;
}
if (MasterElection.isBackup()) {
if (direct) {
LOGGER.info("succ send message(but cancel for backup) directly, topic:{}, dMsgId:{}, len:{}", topic, key, len);
MetricService.incPushQps(topic, metricMsgType, MetricMsgToOrFrom.SEND, MetricPushMsgResult.BACKUP);
} else {
LOGGER.info("succ send message(but cancel for backup) from db, topic:{}, dMsgId:{}, len:{}", topic, key, len);
MetricService.incPushQps(topic, metricMsgType, MetricMsgToOrFrom.DB, MetricPushMsgResult.BACKUP);
}
return true;
}
if (ConfigManager.getConfig().isFakeSend()) {
try {
TimeUnit.MILLISECONDS.sleep(1);
} catch (InterruptedException e) {
}
if (direct) {
LOGGER.info("succ send message directly(fakeSend), topic:{}, dMsgId:{}, len:{}", topic, key, len);
} else {
LOGGER.info("succ send message from db(fakeSend), topic:{}, dMsgId:{}, len:{}", topic, key, len);
}
return true;
}
MessageBuilder messageBuilder = producer.messageBuilder().setTopic(topic).setBody(body).setKey(key).setTags(tags).setRandomPartition();
if (properties != null && properties.size() > 0) {
for (Map.Entry<String, String> entry : properties.entrySet()) {
LOGGER.debug("properties, topic:{}, dMsgId:{}, key:{}, value:{}", topic, key, entry.getKey(), entry.getValue());
// IMPORTANT: If use addProperty for isPressureTraffic, the property will be ignored
if (PRESSURE_TRAFFIC_KEY.equals(entry.getKey())) {
messageBuilder.setPressureTraffic(Boolean.parseBoolean(entry.getValue()));
} else {
messageBuilder.addProperty(entry.getKey(), entry.getValue());
}
}
}
messageBuilder.addProperty(PROPERTY_KEY_FROM_CHRONOS, PROPERTY_KEY_FROM_CHRONOS);
final Result result = messageBuilder.send();
final long cost = (System.nanoTime() - start) / 1000;
MetricService.putPushLatency(topic, cost);
if (result.getCode() == CarreraReturnCode.OK) {
if (direct) {
LOGGER.info("succ send message directly, topic:{}, dMsgId:{}, len:{}, result:{}, cost:{}us", topic, key, len, result, cost);
MetricService.incPushQps(topic, metricMsgType, MetricMsgToOrFrom.SEND, MetricPushMsgResult.OK);
} else {
LOGGER.info("succ send message from db, topic:{}, dMsgId:{}, len:{}, result:{}, cost:{}us", topic, key, len, result, cost);
MetricService.incPushQps(topic, metricMsgType, MetricMsgToOrFrom.DB, MetricPushMsgResult.OK);
}
return true;
} else if (result.getCode() == CarreraReturnCode.FAIL_TOPIC_NOT_EXIST
|| result.getCode() == CarreraReturnCode.FAIL_TOPIC_NOT_ALLOWED
|| result.getCode() == CarreraReturnCode.FAIL_ILLEGAL_MSG
|| result.getCode() == CarreraReturnCode.MISSING_PARAMETERS) {
if (direct) {
LOGGER.error("fail send message directly, topic:{}, dMsgId:{}, len:{}, result:{}, cost:{}us", topic, key, len, result, cost);
MetricService.incPushQps(topic, metricMsgType, MetricMsgToOrFrom.SEND, MetricPushMsgResult.FAIL);
} else {
LOGGER.error("fail send message from db, topic:{}, dMsgId:{}, len:{}, result:{}, cost:{}us", topic, key, len, result, cost);
MetricService.incPushQps(topic, metricMsgType, MetricMsgToOrFrom.DB, MetricPushMsgResult.FAIL);
}
return true;
} else {
if (direct) {
LOGGER.error("error while send message directly, topic:{}, dMsgId:{}, len:{}, result:{}, cost:{}us", topic, key, len, result, cost);
MetricService.incPushQps(topic, metricMsgType, MetricMsgToOrFrom.SEND, MetricPushMsgResult.FAIL);
} else {
LOGGER.error("error while send message from db, topic:{}, dMsgId:{}, len:{}, result:{}, cost:{}us", topic, key, len, result, cost);
MetricService.incPushQps(topic, metricMsgType, MetricMsgToOrFrom.DB, MetricPushMsgResult.FAIL);
}
return false;
}
}
//......
}
- send方法主要是构造messageBuilder，然后执行messageBuilder.send()
小结
pullFromDefaultCFAndPush方法先从metaService获取seekTimestamp及zkSeekTimestamp，若seekTimestamp超过当前时间则提前返回；之后从RDB.newIterator(CFManager.CFH_DEFAULT)获取RocksIterator进行遍历，读取dMsgId构造internalKey，若其type是LOOP_DELAY或者LOOP_EXPONENT_DELAY则通过batcher.putToDefaultCF重新放入rocksdb；之后读取it.value()构造internalValue，紧接着构造InternalPair放入到blockingQueue，之后在count % INTERNAL_PAIR_COUNT == 0时执行sendConcurrent，在循环结束之后再执行一次sendConcurrent；最后更新MetaService.nextSeekTimestamp()
doc
- carrera-chronos
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