If this period of time ("drain period") is longer than any connections, there is zero impact on applications at all.
If not, however, at some point the TCP connection will be torn down.
Depending on the application, this may have a range of impacts (terminating in-flight transactions, etc).

### Ztunnel Shutdown Implementation

The key to this "handoff" between Ztunnels is `SO_REUSEPORT`, which Ztunnel by default sets on all of its listeners.

// used to compute the returned ETag.
func Multipart(etags ...ETag) ETag {
	if len(etags) == 0 {
		return nil
	}

	var n int64
	h := md5.New()
	for _, etag := range etags {
		if !etag.IsMultipart() && !etag.IsEncrypted() {
			h.Write(etag)
			n++
		}
	}
	etag := append(h.Sum(nil), '-')
	return strconv.AppendInt(etag, n, 10)
}

		"foo-v4",
		podIP,
		uint8(unix.IPPROTO_TCP),
		string(podMeta.UID),
		false,
	).Return(nil)
}

func expectPodRemovedFromIPSet(ipsetDeps *ipset.MockedIpsetDeps, podIPs []corev1.PodIP) {
	for _, ip := range podIPs {
		ipsetDeps.On("clearEntriesWithIP",
			"foo-v4",
			netip.MustParseAddr(ip.IP),
		).Return(nil)
	}
}

import org.opensearch.search.aggregations.bucket.missing.MissingAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.IpRangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.RangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.sampler.SamplerAggregationBuilder;

import org.opensearch.search.aggregations.bucket.missing.MissingAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.IpRangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.RangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.sampler.SamplerAggregationBuilder;

		return e
	}
	if st, e := f.Stat(); e == nil {
		sz = st.Size()
	}
	defer f.Close()
	r = f

	zr, e := zip.NewReader(r.(io.ReaderAt), sz)
	if e != nil {
		return e
	}
	for _, file := range zr.File {
		if !file.FileInfo().IsDir() && strings.HasSuffix(file.Name, "xl.meta") {
			r, e := file.Open()
			if e != nil {
				return e
			}
			// Quote string...
			b, _ := json.Marshal(file.Name)

constraints.NotEmpty.message                = {item} may not be empty.
constraints.ParametersScriptAssert.message  = script expression "{script}" didn't evaluate to true.
constraints.Range.message                   = {item} must be between {min} and {max}.
constraints.SafeHtml.message                = {item} may have unsafe html content.

constraints.NotEmpty.message                = {item} may not be empty.
constraints.ParametersScriptAssert.message  = script expression "{script}" didn't evaluate to true.
constraints.Range.message                   = {item} must be between {min} and {max}.
constraints.SafeHtml.message                = {item} may have unsafe html content.

   * guaranteed to be exactly +/-1 even when the data are perfectly (anti-)correlated, due to
   * numerical errors. However, it is guaranteed to be in the inclusive range [-1, +1].
   *
   * <h3>Non-finite values</h3>
   *
   * <p>If the dataset contains any non-finite values ({@link Double#POSITIVE_INFINITY}, {@link

                if (builder instanceof RangeQueryBuilder) {
                    RangeQueryBuilder rangeQueryBuilder = (RangeQueryBuilder) builder;
                    if (rangeQueryBuilder.toString().replaceAll("\\s", "").startsWith("{\"range\":{\"" + name + "\"")) {
                        addRangeC(rangeQueryBuilder, ck, value);
                        return rangeQueryBuilder;
                    }
                }
            }
        }