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xds: CHANNEL_ID hash should be random for the channel #9453

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merged 2 commits into from Aug 19, 2022
Merged

xds: CHANNEL_ID hash should be random for the channel #9453

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xds: CHANNEL_ID hash should be random for the channel
ejona86 Aug 17, 2022
0bd7c23
Swap to using the injected random
ejona86 Aug 18, 2022
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4 changes: 3 additions & 1 deletion xds/src/main/java/io/grpc/xds/XdsNameResolver.java
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Expand Up @@ -84,6 +84,7 @@
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.atomic.AtomicInteger;
import javax.annotation.Nullable;

Expand Down Expand Up @@ -123,6 +124,7 @@ final class XdsNameResolver extends NameResolver {
// put()/remove() must be called in SyncContext, and get() can be called in any thread.
private final ConcurrentMap<String, ClusterRefState> clusterRefs = new ConcurrentHashMap<>();
private final ConfigSelector configSelector = new ConfigSelector();
private final long randomChannelId = ThreadLocalRandom.current().nextLong();
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private volatile RoutingConfig routingConfig = RoutingConfig.empty;
private Listener2 listener;
Expand Down Expand Up @@ -586,7 +588,7 @@ private long generateHash(List<HashPolicy> hashPolicies, Metadata headers) {
newHash = hashFunc.hashAsciiString(value);
}
} else if (policy.type() == HashPolicy.Type.CHANNEL_ID) {
newHash = hashFunc.hashLong(logId.getId());
newHash = hashFunc.hashLong(randomChannelId);
}
if (newHash != null ) {
// Rotating the old value prevents duplicate hash rules from cancelling each other out
Expand Down