/**
* Gets the list of pages in memory that have been changed and hence need to be written as a
* part of the flush operation that is being issued
*
* @param ledgerId Ledger id
* @returns last entry in the in memory pages.
*/
private LinkedList<Long> getFirstEntryListToBeFlushed(long ledgerId) {
ConcurrentMap<Long, LedgerEntryPage> pageMap = pages.get(ledgerId);
if (pageMap == null || pageMap.isEmpty()) {
return null;
}
LinkedList<Long> firstEntryList = new LinkedList<Long>();
for (ConcurrentMap.Entry<Long, LedgerEntryPage> entry : pageMap.entrySet()) {
LedgerEntryPage lep = entry.getValue();
if (lep.isClean()) {
if (!lep.inUse()) {
addToCleanPagesList(lep);
}
if (LOG.isTraceEnabled()) {
LOG.trace("Page is clean " + lep);
}
} else {
firstEntryList.add(lep.getFirstEntry());
}
}
return firstEntryList;
}
public TopologyMetric mergeMetrics() {
long start = System.currentTimeMillis();
if (getMemCache().size() == 0) {
// LOG.info("topology:{}, metric size is 0, skip...", topologyId);
return null;
}
if (isMerging()) {
LOG.info("topology {} is already merging, skip...", topologyId);
return null;
}
setMerging(true);
try {
Map<String, MetricInfo> workerMetricMap = this.memCache;
// reset mem cache
this.memCache = new ConcurrentHashMap<>();
MetricInfo topologyMetrics = MetricUtils.mkMetricInfo();
MetricInfo componentMetrics = MetricUtils.mkMetricInfo();
MetricInfo taskMetrics = MetricUtils.mkMetricInfo();
MetricInfo streamMetrics = MetricUtils.mkMetricInfo();
MetricInfo workerMetrics = MetricUtils.mkMetricInfo();
MetricInfo nettyMetrics = MetricUtils.mkMetricInfo();
TopologyMetric tpMetric =
new TopologyMetric(
topologyMetrics,
componentMetrics,
workerMetrics,
taskMetrics,
streamMetrics,
nettyMetrics);
// metric name => worker count
Map<String, Integer> metricNameCounters = new HashMap<>();
// special for histograms & timers, we merge the points to get a new snapshot data.
Map<String, Map<Integer, Histogram>> histograms = new HashMap<>();
Map<String, Map<Integer, Timer>> timers = new HashMap<>();
// iterate metrics of all workers within the same topology
for (ConcurrentMap.Entry<String, MetricInfo> metricEntry : workerMetricMap.entrySet()) {
MetricInfo metricInfo = metricEntry.getValue();
// merge counters: add old and new values, note we only add incoming new metrics and
// overwrite
// existing data, same for all below.
Map<String, Map<Integer, MetricSnapshot>> metrics = metricInfo.get_metrics();
for (Map.Entry<String, Map<Integer, MetricSnapshot>> metric : metrics.entrySet()) {
String metricName = metric.getKey();
Map<Integer, MetricSnapshot> data = metric.getValue();
MetaType metaType = MetricUtils.metaType(metricName);
MetricType metricType = MetricUtils.metricType(metricName);
if (metricType == MetricType.COUNTER) {
mergeCounters(tpMetric, metaType, metricName, data);
} else if (metricType == MetricType.GAUGE) {
mergeGauges(tpMetric, metaType, metricName, data);
} else if (metricType == MetricType.METER) {
mergeMeters(
getMetricInfoByType(tpMetric, metaType), metricName, data, metricNameCounters);
} else if (metricType == MetricType.HISTOGRAM) {
mergeHistograms(
getMetricInfoByType(tpMetric, metaType),
metricName,
data,
metricNameCounters,
histograms);
} else if (metricType == MetricType.TIMER) {
mergeTimers(
getMetricInfoByType(tpMetric, metaType),
metricName,
data,
metricNameCounters,
timers);
}
}
}
adjustHistogramTimerMetrics(tpMetric, metricNameCounters, histograms, timers);
// for counters, we only report delta data every time, need to sum with old data
// adjustCounterMetrics(tpMetric, oldTpMetric);
LOG.info(
"merge topology metrics:{}, cost:{}", topologyId, System.currentTimeMillis() - start);
// debug logs
// MetricUtils.printMetricWinSize(componentMetrics);
return tpMetric;
} finally {
setMerging(false);
}
}