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Introduce Next Field in Paginated GetSnapshots Response #74236

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Jun 28, 2021
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Introduce Next Field in Paginated GetSnapshots Response #74236

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0092197
Introduce Next Field in Paginated GetSnapshots Response
original-brownbear Jun 17, 2021
6f41fa6
cleanup docs
original-brownbear Jun 17, 2021
622b25b
duration isn't always 0 on ci
original-brownbear Jun 17, 2021
0f9aad3
Merge remote-tracking branch 'elastic/master' into next-field-get-sna…
original-brownbear Jun 26, 2021
e178f43
Merge remote-tracking branch 'elastic/master' into next-field-get-sna…
original-brownbear Jun 27, 2021
d3b362b
fix test
original-brownbear Jun 27, 2021
332cbfb
next field correct in all cases
original-brownbear Jun 28, 2021
60264aa
Merge remote-tracking branch 'elastic/master' into next-field-get-sna…
original-brownbear Jun 28, 2021
8a829d1
base64 encode param
original-brownbear Jun 28, 2021
59ac817
docs + repo tiebraker
original-brownbear Jun 28, 2021
70b957f
Merge remote-tracking branch 'elastic/master' into next-field-get-sna…
original-brownbear Jun 28, 2021
27cf07e
fix param doc stest
original-brownbear Jun 28, 2021
4da55ff
Merge remote-tracking branch 'elastic/master' into next-field-get-sna…
original-brownbear Jun 28, 2021
72f29fe
URL-encode base 64
original-brownbear Jun 28, 2021
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original-brownbear Jun 28, 2021
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original-brownbear Jun 28, 2021
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143 changes: 142 additions & 1 deletion docs/reference/snapshot-restore/apis/get-snapshot-api.asciidoc
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,9 @@ PUT /_snapshot/my_repository

PUT /_snapshot/my_repository/my_snapshot?wait_for_completion=true

PUT /_snapshot/my_repository/snapshot_1?wait_for_completion=true
PUT /_snapshot/my_repository/snapshot_2?wait_for_completion=true
PUT /_snapshot/my_repository/snapshot_3?wait_for_completion=true
----
// TESTSETUP
////
Expand Down Expand Up @@ -128,7 +130,15 @@ Allows setting a sort order for the result. Defaults to `start_time`, i.e. sorti
(Optional, string)
Sort order. Valid values are `asc` for ascending and `desc` for descending order. Defaults to `asc`, meaning ascending order.

NOTE: The pagination parameters `size`, `order`, and `sort` are not supported when using `verbose=false` and the sort order for
`after`::
(Optional, string)
Offset identifier to start pagination from as returned by the `next` field in the response body.
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I think it is worth spending a few lines explaining that the underlying list can change and how pagination works in case of deletes and additions during pagination (i.e., you are sure to not miss any that were in the list originally and have not been deleted during pagination and you may see snapshots added during pagination).

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++ added a few lines on this


NOTE: The `after` parameter and `next` field allow for iterating through snapshots with some consistency guarantees regarding concurrent
creation or deletion of snapshots. It is guaranteed that any snapshot that exists at the beginning of the iteration and not concurrently
deleted will be seen during the iteration. Snapshots concurrently created may be seen during an iteration.

NOTE: The pagination parameters `size`, `order`, `after` and `sort` are not supported when using `verbose=false` and the sort order for
requests with `verbose=false` is undefined.

[role="child_attributes"]
Expand Down Expand Up @@ -268,6 +278,10 @@ The snapshot `state` can be one of the following values:
that were not processed correctly.
====
--
`next`::
(string)
If the request contained a size limit and there might be more results, a `next` field will be added to the response and can be used as the
`after` query parameter to fetch additional results.

[[get-snapshot-api-example]]
==== {api-examples-title}
Expand Down Expand Up @@ -319,3 +333,130 @@ The API returns the following response:
// TESTRESPONSE[s/"end_time": "2020-07-06T21:55:18.129Z"/"end_time": $body.snapshots.0.end_time/]
// TESTRESPONSE[s/"end_time_in_millis": 1593094752018/"end_time_in_millis": $body.snapshots.0.end_time_in_millis/]
// TESTRESPONSE[s/"duration_in_millis": 0/"duration_in_millis": $body.snapshots.0.duration_in_millis/]

The following request returns information for all snapshots with prefix `snapshot` in the `my_repository` repository,
limiting the response size to 2 and sorting by snapshot name.

[source,console]
----
GET /_snapshot/my_repository/snapshot*?size=2&sort=name
----

The API returns the following response:

[source,console-result]
----
{
"snapshots": [
{
"snapshot": "snapshot_1",
"uuid": "dKb54xw67gvdRctLCxSket",
"repository": "my_repository",
"version_id": <version_id>,
"version": <version>,
"indices": [],
"data_streams": [],
"feature_states": [],
"include_global_state": true,
"state": "SUCCESS",
"start_time": "2020-07-06T21:55:18.129Z",
"start_time_in_millis": 1593093628850,
"end_time": "2020-07-06T21:55:18.129Z",
"end_time_in_millis": 1593094752018,
"duration_in_millis": 0,
"failures": [],
"shards": {
"total": 0,
"failed": 0,
"successful": 0
}
},
{
"snapshot": "snapshot_2",
"uuid": "vdRctLCxSketdKb54xw67g",
"repository": "my_repository",
"version_id": <version_id>,
"version": <version>,
"indices": [],
"data_streams": [],
"feature_states": [],
"include_global_state": true,
"state": "SUCCESS",
"start_time": "2020-07-06T21:55:18.130Z",
"start_time_in_millis": 1593093628851,
"end_time": "2020-07-06T21:55:18.130Z",
"end_time_in_millis": 1593094752019,
"duration_in_millis": 1,
"failures": [],
"shards": {
"total": 0,
"failed": 0,
"successful": 0
}
}
],
"next": "c25hcHNob3RfMixteV9yZXBvc2l0b3J5LHNuYXBzaG90XzI="
}
----
// TESTRESPONSE[s/"uuid": "dKb54xw67gvdRctLCxSket"/"uuid": $body.snapshots.0.uuid/]
// TESTRESPONSE[s/"uuid": "vdRctLCxSketdKb54xw67g"/"uuid": $body.snapshots.1.uuid/]
// TESTRESPONSE[s/"version_id": <version_id>/"version_id": $body.snapshots.0.version_id/]
// TESTRESPONSE[s/"version": <version>/"version": $body.snapshots.0.version/]
// TESTRESPONSE[s/"start_time": "2020-07-06T21:55:18.129Z"/"start_time": $body.snapshots.0.start_time/]
// TESTRESPONSE[s/"start_time": "2020-07-06T21:55:18.130Z"/"start_time": $body.snapshots.1.start_time/]
// TESTRESPONSE[s/"start_time_in_millis": 1593093628850/"start_time_in_millis": $body.snapshots.0.start_time_in_millis/]
// TESTRESPONSE[s/"start_time_in_millis": 1593093628851/"start_time_in_millis": $body.snapshots.1.start_time_in_millis/]
// TESTRESPONSE[s/"end_time": "2020-07-06T21:55:18.129Z"/"end_time": $body.snapshots.0.end_time/]
// TESTRESPONSE[s/"end_time": "2020-07-06T21:55:18.130Z"/"end_time": $body.snapshots.1.end_time/]
// TESTRESPONSE[s/"end_time_in_millis": 1593094752018/"end_time_in_millis": $body.snapshots.0.end_time_in_millis/]
// TESTRESPONSE[s/"end_time_in_millis": 1593094752019/"end_time_in_millis": $body.snapshots.1.end_time_in_millis/]
// TESTRESPONSE[s/"duration_in_millis": 0/"duration_in_millis": $body.snapshots.0.duration_in_millis/]
// TESTRESPONSE[s/"duration_in_millis": 1/"duration_in_millis": $body.snapshots.1.duration_in_millis/]

A subsequent request for the remaining snapshots can then be made using the `next` value from the previous response as `after` parameter.

[source,console]
----
GET /_snapshot/my_repository/snapshot*?size=2&sort=name&after=c25hcHNob3RfMixteV9yZXBvc2l0b3J5LHNuYXBzaG90XzI=
----

The API returns the following response:

[source,console-result]
----
{
"snapshots": [
{
"snapshot": "snapshot_3",
"uuid": "dRctdKb54xw67gvLCxSket",
"repository": "my_repository",
"version_id": <version_id>,
"version": <version>,
"indices": [],
"data_streams": [],
"feature_states": [],
"include_global_state": true,
"state": "SUCCESS",
"start_time": "2020-07-06T21:55:18.129Z",
"start_time_in_millis": 1593093628850,
"end_time": "2020-07-06T21:55:18.129Z",
"end_time_in_millis": 1593094752018,
"duration_in_millis": 0,
"failures": [],
"shards": {
"total": 0,
"failed": 0,
"successful": 0
}
}
]
}
----
// TESTRESPONSE[s/"uuid": "dRctdKb54xw67gvLCxSket"/"uuid": $body.snapshots.0.uuid/]
// TESTRESPONSE[s/"version_id": <version_id>/"version_id": $body.snapshots.0.version_id/]
// TESTRESPONSE[s/"version": <version>/"version": $body.snapshots.0.version/]
// TESTRESPONSE[s/"start_time": "2020-07-06T21:55:18.129Z"/"start_time": $body.snapshots.0.start_time/]
// TESTRESPONSE[s/"start_time_in_millis": 1593093628850/"start_time_in_millis": $body.snapshots.0.start_time_in_millis/]
// TESTRESPONSE[s/"end_time": "2020-07-06T21:55:18.129Z"/"end_time": $body.snapshots.0.end_time/]
// TESTRESPONSE[s/"end_time_in_millis": 1593094752018/"end_time_in_millis": $body.snapshots.0.end_time_in_millis/]
// TESTRESPONSE[s/"duration_in_millis": 0/"duration_in_millis": $body.snapshots.0.duration_in_millis/]
77 changes: 35 additions & 42 deletions qa/smoke-test-http/src/test/java/org/elasticsearch/http/snapshots/RestGetSnapshotsIT.java
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
import org.elasticsearch.common.xcontent.NamedXContentRegistry;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.json.JsonXContent;
import org.elasticsearch.core.Tuple;
import org.elasticsearch.search.sort.SortOrder;
import org.elasticsearch.snapshots.AbstractSnapshotIntegTestCase;
import org.elasticsearch.snapshots.SnapshotInfo;
Expand Down Expand Up @@ -64,8 +65,7 @@ public void testSortOrder() throws Exception {
}

private void doTestSortOrder(String repoName, Collection<String> allSnapshotNames, SortOrder order) throws IOException {
final List<SnapshotInfo> defaultSorting =
clusterAdmin().prepareGetSnapshots(repoName).setOrder(order).get().getSnapshots();
final List<SnapshotInfo> defaultSorting = clusterAdmin().prepareGetSnapshots(repoName).setOrder(order).get().getSnapshots();
assertSnapshotListSorted(defaultSorting, null, order);
assertSnapshotListSorted(
allSnapshotsSorted(allSnapshotNames, repoName, GetSnapshotsRequest.SortBy.NAME, order),
Expand Down Expand Up @@ -106,24 +106,31 @@ private void doTestPagination(String repoName,
GetSnapshotsRequest.SortBy sort,
SortOrder order) throws IOException {
final List<SnapshotInfo> allSnapshotsSorted = allSnapshotsSorted(names, repoName, sort, order);
final List<SnapshotInfo> batch1 = sortedWithLimit(repoName, sort, 2, order);
assertEquals(batch1, allSnapshotsSorted.subList(0, 2));
final List<SnapshotInfo> batch2 = sortedWithLimit(repoName, sort, batch1.get(1), 2, order);
assertEquals(batch2, allSnapshotsSorted.subList(2, 4));
final int lastBatch = names.size() - batch1.size() - batch2.size();
final List<SnapshotInfo> batch3 = sortedWithLimit(repoName, sort, batch2.get(1), lastBatch, order);
assertEquals(batch3, allSnapshotsSorted.subList(batch1.size() + batch2.size(), names.size()));
final List<SnapshotInfo> batch3NoLimit =
sortedWithLimit(repoName, sort, batch2.get(1), GetSnapshotsRequest.NO_LIMIT, order);
assertEquals(batch3, batch3NoLimit);
final List<SnapshotInfo> batch3LargeLimit = sortedWithLimit(
final Tuple<String, List<SnapshotInfo>> batch1 = sortedWithLimit(repoName, sort, null, 2, order);
assertEquals(allSnapshotsSorted.subList(0, 2), batch1.v2());
final Tuple<String, List<SnapshotInfo>> batch2 = sortedWithLimit(repoName, sort, batch1.v1(), 2, order);
assertEquals(allSnapshotsSorted.subList(2, 4), batch2.v2());
final int lastBatch = names.size() - batch1.v2().size() - batch2.v2().size();
final Tuple<String, List<SnapshotInfo>> batch3 = sortedWithLimit(repoName, sort, batch2.v1(), lastBatch, order);
assertEquals(batch3.v2(), allSnapshotsSorted.subList(batch1.v2().size() + batch2.v2().size(), names.size()));
final Tuple<String, List<SnapshotInfo>> batch3NoLimit = sortedWithLimit(
repoName,
sort,
batch2.get(1),
batch2.v1(),
GetSnapshotsRequest.NO_LIMIT,
order
);
assertNull(batch3NoLimit.v1());
assertEquals(batch3.v2(), batch3NoLimit.v2());
final Tuple<String, List<SnapshotInfo>> batch3LargeLimit = sortedWithLimit(
repoName,
sort,
batch2.v1(),
lastBatch + randomIntBetween(1, 100),
order
);
assertEquals(batch3, batch3LargeLimit);
assertEquals(batch3.v2(), batch3LargeLimit.v2());
assertNull(batch3LargeLimit.v1());
}

public void testSortAndPaginateWithInProgress() throws Exception {
Expand Down Expand Up @@ -173,14 +180,15 @@ private static void assertStablePagination(String repoName,
final List<SnapshotInfo> allSorted = allSnapshotsSorted(allSnapshotNames, repoName, sort, order);

for (int i = 1; i <= allSnapshotNames.size(); i++) {
final List<SnapshotInfo> subsetSorted = sortedWithLimit(repoName, sort, i, order);
final List<SnapshotInfo> subsetSorted = sortedWithLimit(repoName, sort, null, i, order).v2();
assertEquals(subsetSorted, allSorted.subList(0, i));
}

for (int j = 0; j < allSnapshotNames.size(); j++) {
final SnapshotInfo after = allSorted.get(j);
for (int i = 1; i < allSnapshotNames.size() - j; i++) {
final List<SnapshotInfo> subsetSorted = sortedWithLimit(repoName, sort, after, i, order);
final List<SnapshotInfo> subsetSorted = sortedWithLimit(
repoName, sort, GetSnapshotsRequest.After.from(after, sort).asQueryParam(), i, order).v2();
assertEquals(subsetSorted, allSorted.subList(j + 1, j + i + 1));
}
}
Expand All @@ -196,7 +204,7 @@ private static List<SnapshotInfo> allSnapshotsSorted(Collection<String> allSnaps
request.addParameter("order", order.toString());
}
final Response response = getRestClient().performRequest(request);
final List<SnapshotInfo> snapshotInfos = readSnapshotInfos(response);
final List<SnapshotInfo> snapshotInfos = readSnapshotInfos(response).v2();
assertEquals(snapshotInfos.size(), allSnapshotNames.size());
for (SnapshotInfo snapshotInfo : snapshotInfos) {
assertThat(snapshotInfo.snapshotId().getName(), is(in(allSnapshotNames)));
Expand All @@ -208,42 +216,27 @@ private static Request baseGetSnapshotsRequest(String repoName) {
return new Request(HttpGet.METHOD_NAME, "/_snapshot/" + repoName + "/*");
}

private static List<SnapshotInfo> sortedWithLimit(String repoName,
GetSnapshotsRequest.SortBy sortBy,
int size,
SortOrder order) throws IOException {
final Request request = baseGetSnapshotsRequest(repoName);
request.addParameter("sort", sortBy.toString());
if (order == SortOrder.DESC || randomBoolean()) {
request.addParameter("order", order.toString());
}
request.addParameter("size", String.valueOf(size));
final Response response = getRestClient().performRequest(request);
return readSnapshotInfos(response);
}

private static List<SnapshotInfo> readSnapshotInfos(Response response) throws IOException {
final List<SnapshotInfo> snapshotInfos;
private static Tuple<String, List<SnapshotInfo>> readSnapshotInfos(Response response) throws IOException {
try (InputStream input = response.getEntity().getContent();
XContentParser parser = JsonXContent.jsonXContent.createParser(
NamedXContentRegistry.EMPTY, DeprecationHandler.THROW_UNSUPPORTED_OPERATION, input)) {
snapshotInfos = GetSnapshotsResponse.fromXContent(parser).getSnapshots();
final GetSnapshotsResponse getSnapshotsResponse = GetSnapshotsResponse.fromXContent(parser);
return Tuple.tuple(getSnapshotsResponse.next(), getSnapshotsResponse.getSnapshots());
}
return snapshotInfos;
}

private static List<SnapshotInfo> sortedWithLimit(String repoName,
GetSnapshotsRequest.SortBy sortBy,
SnapshotInfo after,
int size,
SortOrder order) throws IOException {
private static Tuple<String, List<SnapshotInfo>> sortedWithLimit(String repoName,
GetSnapshotsRequest.SortBy sortBy,
String after,
int size,
SortOrder order) throws IOException {
final Request request = baseGetSnapshotsRequest(repoName);
request.addParameter("sort", sortBy.toString());
if (size != GetSnapshotsRequest.NO_LIMIT || randomBoolean()) {
request.addParameter("size", String.valueOf(size));
}
if (after != null) {
request.addParameter("after", GetSnapshotsRequest.After.from(after, sortBy).value() + "," + after.snapshotId().getName());
request.addParameter("after", after);
}
if (order == SortOrder.DESC || randomBoolean()) {
request.addParameter("order", order.toString());
Expand Down
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