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NMS-19647: Fix out-of-order sample loss by making remote write synchronous #109

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NMS-19647: Fix out-of-order sample loss by making remote write synchronous #109

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22 changes: 13 additions & 9 deletions plugin/src/main/java/org/opennms/timeseries/cortex/CortexTSS.java
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Original file line number Diff line number Diff line change
Expand Up @@ -233,15 +233,19 @@ public void store(final List<Sample> samples, String clientID) throws StorageExc
final Request request = builder.build();

LOG.trace("Writing: {}", writeRequest);
asyncHttpCallsBulkhead.executeCompletionStage(() -> executeAsync(request)).whenComplete((r, ex) -> {
if (ex == null) {
samplesWritten.mark(samplesSorted.size());
} else {
// FIXME: Data loss
samplesLost.mark(samples.size());
LOG.error("Error occurred while storing samples, sample will be lost.", ex);
}
});
// Block until the HTTP write completes. This ensures the ring buffer worker
// thread does not process the next batch until this write has landed, preserving
// per-series timestamp ordering across consecutive WriteRequests as required by
// the Prometheus Remote Write spec.
try {
asyncHttpCallsBulkhead.executeCompletionStage(() -> executeAsync(request)).toCompletableFuture().get(
config.getWriteTimeoutInMs(), TimeUnit.MILLISECONDS);
samplesWritten.mark(samplesSorted.size());
} catch (Exception ex) {
samplesLost.mark(samplesSorted.size());
Throwable cause = ex.getCause() != null ? ex.getCause() : ex;
throw new StorageException("Failed to write samples to Prometheus: " + cause.getMessage(), cause);
}
}

private void persistExternalTags(final Sample s) {
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