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Introduce experimental searchable snapshot API
This commit adds a new parameter to the snapshot restore API to restore to a new type of "remote snapshot" index where, unlike traditional snapshot restores, the index data is not all downloaded to disk and instead is read on-demand at search time. The feature is functional with this commit, and includes a simple end-to-end integration test, but is far from complete. See tracking issue opensearch-project#2919 for the rest of the work planned/underway. All new capabilities are gated behind a new searchable snapshot feature flag.
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server/src/internalClusterTest/java/org/opensearch/snapshots/SearchableSnapshotIT.java
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| @@ -0,0 +1,133 @@ | ||
| /* | ||
| * Copyright OpenSearch Contributors | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
| package org.opensearch.snapshots; | ||
|
|
||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.util.List; | ||
|
|
||
| import org.hamcrest.MatcherAssert; | ||
| import org.junit.BeforeClass; | ||
| import org.opensearch.action.admin.cluster.node.stats.NodesStatsResponse; | ||
| import org.opensearch.action.admin.cluster.snapshots.create.CreateSnapshotResponse; | ||
| import org.opensearch.client.Client; | ||
| import org.opensearch.cluster.ClusterState; | ||
| import org.opensearch.cluster.metadata.IndexMetadata; | ||
| import org.opensearch.cluster.routing.GroupShardsIterator; | ||
| import org.opensearch.cluster.routing.ShardIterator; | ||
| import org.opensearch.cluster.routing.ShardRouting; | ||
| import org.opensearch.common.io.PathUtils; | ||
| import org.opensearch.common.settings.Settings; | ||
| import org.opensearch.common.util.FeatureFlags; | ||
| import org.opensearch.index.Index; | ||
| import org.opensearch.monitor.fs.FsInfo; | ||
|
|
||
| import com.carrotsearch.randomizedtesting.generators.RandomPicks; | ||
|
|
||
| import static org.hamcrest.Matchers.equalTo; | ||
| import static org.hamcrest.Matchers.greaterThan; | ||
| import static org.hamcrest.Matchers.is; | ||
| import static org.opensearch.action.admin.cluster.node.stats.NodesStatsRequest.Metric.FS; | ||
| import static org.opensearch.common.util.CollectionUtils.iterableAsArrayList; | ||
|
|
||
| public final class SearchableSnapshotIT extends AbstractSnapshotIntegTestCase { | ||
|
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| @BeforeClass | ||
| public static void assumeFeatureFlag() { | ||
| assumeTrue( | ||
| "Searchable snapshot feature flag is enabled", | ||
| Boolean.parseBoolean(System.getProperty(FeatureFlags.SEARCHABLE_SNAPSHOTS)) | ||
| ); | ||
| } | ||
|
|
||
| @Override | ||
| protected boolean addMockInternalEngine() { | ||
| return false; | ||
| } | ||
|
|
||
| public void testCreateSearchableSnapshot() throws Exception { | ||
| final Client client = client(); | ||
| createRepository("test-repo", "fs"); | ||
| createIndex( | ||
| "test-idx-1", | ||
| Settings.builder().put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, "0").put(IndexMetadata.SETTING_NUMBER_OF_SHARDS, "1").build() | ||
| ); | ||
| createIndex( | ||
| "test-idx-2", | ||
| Settings.builder().put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, "0").put(IndexMetadata.SETTING_NUMBER_OF_SHARDS, "1").build() | ||
| ); | ||
| ensureGreen(); | ||
| indexRandomDocs("test-idx-1", 100); | ||
| indexRandomDocs("test-idx-2", 100); | ||
|
|
||
| logger.info("--> snapshot"); | ||
| final CreateSnapshotResponse createSnapshotResponse = client.admin() | ||
| .cluster() | ||
| .prepareCreateSnapshot("test-repo", "test-snap") | ||
| .setWaitForCompletion(true) | ||
| .setIndices("test-idx-1", "test-idx-2") | ||
| .get(); | ||
| MatcherAssert.assertThat(createSnapshotResponse.getSnapshotInfo().successfulShards(), greaterThan(0)); | ||
| MatcherAssert.assertThat( | ||
| createSnapshotResponse.getSnapshotInfo().successfulShards(), | ||
| equalTo(createSnapshotResponse.getSnapshotInfo().totalShards()) | ||
| ); | ||
|
|
||
| assertTrue(client.admin().indices().prepareDelete("test-idx-1", "test-idx-2").get().isAcknowledged()); | ||
|
|
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| logger.info("--> restore indices as 'remote_snapshot'"); | ||
| client.admin() | ||
| .cluster() | ||
| .prepareRestoreSnapshot("test-repo", "test-snap") | ||
| .setRenamePattern("(.+)") | ||
| .setRenameReplacement("$1-copy") | ||
| .setStorageType("remote_snapshot") | ||
| .execute() | ||
| .actionGet(); | ||
| ensureGreen(); | ||
|
|
||
| assertDocCount("test-idx-1-copy", 100L); | ||
| assertDocCount("test-idx-2-copy", 100L); | ||
| assertIndexDirectoryDoesNotExist("test-idx-1-copy", "test-idx-2-copy"); | ||
| } | ||
|
|
||
| /** | ||
| * Picks a shard out of the cluster state for each given index and asserts | ||
| * that the 'index' directory does not exist in the node's file system. | ||
| * This assertion is digging a bit into the implementation details to | ||
| * verify that the Lucene segment files are not copied from the snapshot | ||
| * repository to the node's local disk for a remote snapshot index. | ||
| */ | ||
| private void assertIndexDirectoryDoesNotExist(String... indexNames) { | ||
| final ClusterState state = client().admin().cluster().prepareState().get().getState(); | ||
| for (String indexName : indexNames) { | ||
| final Index index = state.metadata().index(indexName).getIndex(); | ||
| // Get the primary shards for the given index | ||
| final GroupShardsIterator<ShardIterator> shardIterators = state.getRoutingTable() | ||
| .activePrimaryShardsGrouped(new String[] { indexName }, false); | ||
| // Randomly pick one of the shards | ||
| final List<ShardIterator> iterators = iterableAsArrayList(shardIterators); | ||
| final ShardIterator shardIterator = RandomPicks.randomFrom(random(), iterators); | ||
| final ShardRouting shardRouting = shardIterator.nextOrNull(); | ||
| assertNotNull(shardRouting); | ||
| assertTrue(shardRouting.primary()); | ||
| assertTrue(shardRouting.assignedToNode()); | ||
| // Get the file system stats for the assigned node | ||
| final String nodeId = shardRouting.currentNodeId(); | ||
| final NodesStatsResponse nodeStats = client().admin().cluster().prepareNodesStats(nodeId).addMetric(FS.metricName()).get(); | ||
| for (FsInfo.Path info : nodeStats.getNodes().get(0).getFs()) { | ||
| // Build the expected path for the index data for a "normal" | ||
| // index and assert it does not exist | ||
| final String path = info.getPath(); | ||
| final Path file = PathUtils.get(path) | ||
| .resolve("indices") | ||
| .resolve(index.getUUID()) | ||
| .resolve(Integer.toString(shardRouting.getId())) | ||
| .resolve("index"); | ||
| MatcherAssert.assertThat("Expect file not to exist: " + file, Files.exists(file), is(false)); | ||
| } | ||
| } | ||
| } | ||
| } |
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