metadata-drivers/etcd/src/main/java/org/apache/bookkeeper/metadata/etcd/helpers/ValueStream.java [285:300]:
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    public CompletableFuture<Void> closeAsync() {
        CompletableFuture<Void> future;
        synchronized (this) {
            if (null == closeFuture) {
                closeFuture = closeOrRewatch(false).thenCompose(ignored -> {
                    if (ownWatchClient) {
                        return watchClient.closeAsync();
                    } else {
                        return FutureUtils.Void();
                    }
                });
            }
            future = closeFuture;
        }
        return future;
    }
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metadata-drivers/etcd/src/main/java/org/apache/bookkeeper/metadata/etcd/helpers/KeySetReader.java [257:272]:
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    public CompletableFuture<Void> closeAsync() {
        CompletableFuture<Void> future;
        synchronized (this) {
            if (null == closeFuture) {
                closeFuture = closeOrRewatch(false).thenCompose(ignored -> {
                    if (ownWatchClient) {
                        return watchClient.closeAsync();
                    } else {
                        return FutureUtils.Void();
                    }
                });
            }
            future = closeFuture;
        }
        return future;
    }
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