muse-dev[bot] commented on a change in pull request #6602:
URL: https://github.com/apache/skywalking/pull/6602#discussion_r599452462
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File path:
oap-server/exporter/src/main/java/org/apache/skywalking/oap/server/exporter/provider/grpc/GRPCExporter.java
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@@ -67,27 +73,52 @@ public GRPCExporter(GRPCExporterSetting setting) {
blockingStub = MetricExportServiceGrpc.newBlockingStub(channel);
exportBuffer = new
DataCarrier<ExportData>(setting.getBufferChannelNum(),
setting.getBufferChannelSize());
exportBuffer.consume(this, 1, 200);
- subscriptionSet = new HashSet<>();
+ subscriptionList = new ArrayList<>();
+ fetchListLock = new ReentrantLock();
}
@Override
public void export(ExportEvent event) {
- if (ExportEvent.EventType.TOTAL == event.getType()) {
- Metrics metrics = event.getMetrics();
- if (metrics instanceof WithMetadata) {
- MetricsMetaInfo meta = ((WithMetadata) metrics).getMeta();
- if (subscriptionSet.size() == 0 ||
subscriptionSet.contains(meta.getMetricsName())) {
- exportBuffer.produce(new ExportData(meta, metrics));
- }
+ Metrics metrics = event.getMetrics();
+ if (metrics instanceof WithMetadata) {
+ MetricsMetaInfo meta = ((WithMetadata) metrics).getMeta();
+ if (subscriptionList.size() == 0 &&
ExportEvent.EventType.INCREMENT.equals(event.getType())) {
Review comment:
*THREAD_SAFETY_VIOLATION:* Read/Write race. Non-private method
`GRPCExporter.export(...)` reads without synchronization from container
`this.subscriptionList` via call to `List.size()`. Potentially races with write
in method `GRPCExporter.fetchSubscriptionList()`.
Reporting because another access to the same memory occurs on a background
thread, although this access may not.
(at-me [in a reply](https://docs.muse.dev/docs/talk-to-muse/) with `help` or
`ignore`)
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