Adds cluster setting to configure index state management jitter

src/main/kotlin/org/opensearch/indexmanagement/IndexManagementPlugin.kt

@@ -380,6 +380,7 @@ class IndexManagementPlugin : JobSchedulerExtension, NetworkPlugin, ActionPlugin
             ManagedIndexSettings.INDEX_STATE_MANAGEMENT_ENABLED,
             ManagedIndexSettings.METADATA_SERVICE_ENABLED,
             ManagedIndexSettings.AUTO_MANAGE,
+            ManagedIndexSettings.JITTER,
             ManagedIndexSettings.JOB_INTERVAL,
             ManagedIndexSettings.SWEEP_PERIOD,
             ManagedIndexSettings.COORDINATOR_BACKOFF_COUNT,

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/ManagedIndexCoordinator.kt

@@ -75,6 +75,7 @@ import org.opensearch.indexmanagement.indexstatemanagement.settings.ManagedIndex
 import org.opensearch.indexmanagement.indexstatemanagement.settings.ManagedIndexSettings.Companion.COORDINATOR_BACKOFF_COUNT
 import org.opensearch.indexmanagement.indexstatemanagement.settings.ManagedIndexSettings.Companion.COORDINATOR_BACKOFF_MILLIS
 import org.opensearch.indexmanagement.indexstatemanagement.settings.ManagedIndexSettings.Companion.INDEX_STATE_MANAGEMENT_ENABLED
+import org.opensearch.indexmanagement.indexstatemanagement.settings.ManagedIndexSettings.Companion.JITTER
 import org.opensearch.indexmanagement.indexstatemanagement.settings.ManagedIndexSettings.Companion.JOB_INTERVAL
 import org.opensearch.indexmanagement.indexstatemanagement.settings.ManagedIndexSettings.Companion.METADATA_SERVICE_ENABLED
 import org.opensearch.indexmanagement.indexstatemanagement.settings.ManagedIndexSettings.Companion.SWEEP_PERIOD
@@ -145,6 +146,7 @@ class ManagedIndexCoordinator(
     @Volatile private var retryPolicy =
         BackoffPolicy.constantBackoff(COORDINATOR_BACKOFF_MILLIS.get(settings), COORDINATOR_BACKOFF_COUNT.get(settings))
     @Volatile private var jobInterval = JOB_INTERVAL.get(settings)
+    @Volatile private var jobJitter = JITTER.get(settings)
 
     @Volatile private var isMaster = false
 
@@ -158,6 +160,9 @@ class ManagedIndexCoordinator(
         clusterService.clusterSettings.addSettingsUpdateConsumer(JOB_INTERVAL) {
             jobInterval = it
         }
+        clusterService.clusterSettings.addSettingsUpdateConsumer(JITTER) {
+            jobJitter = it
+        }
         clusterService.clusterSettings.addSettingsUpdateConsumer(INDEX_STATE_MANAGEMENT_ENABLED) {
             indexStateManagementEnabled = it
             if (!indexStateManagementEnabled) disable() else enable()
@@ -328,7 +333,8 @@ class ManagedIndexCoordinator(
                                 indexUuid,
                                 policy.id,
                                 jobInterval,
-                                policy
+                                policy,
+                                jobJitter
                             )
                         )
                     }

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/model/ManagedIndexConfig.kt

@@ -56,7 +56,8 @@ data class ManagedIndexConfig(
     val policySeqNo: Long?,
     val policyPrimaryTerm: Long?,
     val policy: Policy?,
-    val changePolicy: ChangePolicy?
+    val changePolicy: ChangePolicy?,
+    val jobJitter: Double?
 ) : ScheduledJobParameter {
 
     init {
@@ -79,6 +80,10 @@ data class ManagedIndexConfig(
 
     override fun getLockDurationSeconds(): Long = 3600L // 1 hour
 
+    override fun getJitter(): Double? {
+        return jobJitter
+    }
+
     override fun toXContent(builder: XContentBuilder, params: ToXContent.Params): XContentBuilder {
         builder
             .startObject()
@@ -95,6 +100,7 @@ data class ManagedIndexConfig(
             .field(POLICY_PRIMARY_TERM_FIELD, policyPrimaryTerm)
             .field(POLICY_FIELD, policy, XCONTENT_WITHOUT_TYPE)
             .field(CHANGE_POLICY_FIELD, changePolicy)
+            .field(JITTER, jobJitter)
         builder.endObject()
         return builder.endObject()
     }
@@ -114,6 +120,7 @@ data class ManagedIndexConfig(
         const val POLICY_SEQ_NO_FIELD = "policy_seq_no"
         const val POLICY_PRIMARY_TERM_FIELD = "policy_primary_term"
         const val CHANGE_POLICY_FIELD = "change_policy"
+        const val JITTER = "jitter"
 
         @Suppress("ComplexMethod", "LongMethod")
         @JvmStatic
@@ -137,6 +144,7 @@ data class ManagedIndexConfig(
             var enabled = true
             var policyPrimaryTerm: Long? = SequenceNumbers.UNASSIGNED_PRIMARY_TERM
             var policySeqNo: Long? = SequenceNumbers.UNASSIGNED_SEQ_NO
+            var jitter: Double? = null
 
             ensureExpectedToken(Token.START_OBJECT, xcp.currentToken(), xcp)
             while (xcp.nextToken() != Token.END_OBJECT) {
@@ -164,6 +172,9 @@ data class ManagedIndexConfig(
                     CHANGE_POLICY_FIELD -> {
                         changePolicy = if (xcp.currentToken() == Token.VALUE_NULL) null else ChangePolicy.parse(xcp)
                     }
+                    JITTER -> {
+                        jitter = if (xcp.currentToken() == Token.VALUE_NULL) null else xcp.doubleValue()
+                    }
                     else -> throw IllegalArgumentException("Invalid field: [$fieldName] found in ManagedIndexConfig.")
                 }
             }
@@ -192,7 +203,8 @@ data class ManagedIndexConfig(
                     seqNo = policySeqNo ?: SequenceNumbers.UNASSIGNED_SEQ_NO,
                     primaryTerm = policyPrimaryTerm ?: SequenceNumbers.UNASSIGNED_PRIMARY_TERM
                 ),
-                changePolicy = changePolicy
+                changePolicy = changePolicy,
+                jobJitter = jitter
             )
         }
     }

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/settings/ManagedIndexSettings.kt

@@ -36,6 +36,7 @@ class ManagedIndexSettings {
         const val DEFAULT_ISM_ENABLED = true
         const val DEFAULT_METADATA_SERVICE_ENABLED = true
         const val DEFAULT_JOB_INTERVAL = 5
+        const val DEFAULT_JITTER = 0.6
         private val ALLOW_LIST_ALL = ActionConfig.ActionType.values().toList().map { it.type }
         val ALLOW_LIST_NONE = emptyList<String>()
         val SNAPSHOT_DENY_LIST_NONE = emptyList<String>()
@@ -179,5 +180,14 @@ class ManagedIndexSettings {
             Setting.Property.NodeScope,
             Setting.Property.Dynamic
         )
+
+        val JITTER: Setting<Double> = Setting.doubleSetting(
+            "plugins.index_state_management.jitter",
+            DEFAULT_JITTER,
+            0.0,
+            1.0,
+            Setting.Property.NodeScope,
+            Setting.Property.Dynamic
+        )
     }
 }

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/transport/action/addpolicy/TransportAddPolicyAction.kt

@@ -93,12 +93,16 @@ class TransportAddPolicyAction @Inject constructor(
 ) {
 
     @Volatile private var jobInterval = ManagedIndexSettings.JOB_INTERVAL.get(settings)
+    @Volatile private var jobJitter = ManagedIndexSettings.JITTER.get(settings)
     @Volatile private var filterByEnabled = IndexManagementSettings.FILTER_BY_BACKEND_ROLES.get(settings)
 
     init {
         clusterService.clusterSettings.addSettingsUpdateConsumer(ManagedIndexSettings.JOB_INTERVAL) {
             jobInterval = it
         }
+        clusterService.clusterSettings.addSettingsUpdateConsumer(ManagedIndexSettings.JITTER) {
+            jobJitter = it
+        }
         clusterService.clusterSettings.addSettingsUpdateConsumer(IndexManagementSettings.FILTER_BY_BACKEND_ROLES) {
             filterByEnabled = it
         }
@@ -329,7 +333,7 @@ class TransportAddPolicyAction @Inject constructor(
                 val bulkReq = BulkRequest().timeout(TimeValue.timeValueMillis(bulkReqTimeout))
                 indicesToAdd.forEach { (uuid, name) ->
                     bulkReq.add(
-                        managedIndexConfigIndexRequest(name, uuid, request.policyID, jobInterval, policy = policy.copy(user = this.user))
+                        managedIndexConfigIndexRequest(name, uuid, request.policyID, jobInterval, policy = policy.copy(user = this.user), jobJitter)
                     )
                 }
 

src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/util/ManagedIndexUtils.kt

@@ -76,12 +76,14 @@ import java.net.InetAddress
 import java.time.Instant
 import java.time.temporal.ChronoUnit
 
+@Suppress("LongParameterList")
 fun managedIndexConfigIndexRequest(
     index: String,
     uuid: String,
     policyID: String,
     jobInterval: Int,
-    policy: Policy? = null
+    policy: Policy? = null,
+    jobJitter: Double?
 ): IndexRequest {
     val managedIndexConfig = ManagedIndexConfig(
         jobName = index,
@@ -95,7 +97,8 @@ fun managedIndexConfigIndexRequest(
         policy = policy,
         policySeqNo = policy?.seqNo,
         policyPrimaryTerm = policy?.primaryTerm,
-        changePolicy = null
+        changePolicy = null,
+        jobJitter = jobJitter
     )
 
     return IndexRequest(INDEX_MANAGEMENT_INDEX)

src/main/resources/mappings/opendistro-ism-config.json

@@ -1,6 +1,6 @@
 {
   "_meta" : {
-    "schema_version": 11
+    "schema_version": 12
   },
   "dynamic": "strict",
   "properties": {
@@ -614,6 +614,9 @@
               }
             }
           }
+        },
+        "jitter": {
+          "type": "double"
         }
       }
     },

src/test/kotlin/org/opensearch/indexmanagement/IndexManagementRestTestCase.kt

@@ -46,7 +46,7 @@ import javax.management.remote.JMXServiceURL
 
 abstract class IndexManagementRestTestCase : ODFERestTestCase() {
 
-    val configSchemaVersion = 11
+    val configSchemaVersion = 12
     val historySchemaVersion = 3
 
     // Having issues with tests leaking into other tests and mappings being incorrect and they are not caught by any pending task wait check as

src/test/kotlin/org/opensearch/indexmanagement/IndexManagementSettingsTests.kt

@@ -103,6 +103,7 @@ class IndexManagementSettingsTests : OpenSearchTestCase() {
                     ManagedIndexSettings.COORDINATOR_BACKOFF_MILLIS,
                     ManagedIndexSettings.ALLOW_LIST,
                     ManagedIndexSettings.SNAPSHOT_DENY_LIST,
+                    ManagedIndexSettings.JITTER,
                     RollupSettings.ROLLUP_INGEST_BACKOFF_COUNT,
                     RollupSettings.ROLLUP_INGEST_BACKOFF_MILLIS,
                     RollupSettings.ROLLUP_SEARCH_BACKOFF_COUNT,

src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/IndexStateManagementIntegTestCase.kt

@@ -28,6 +28,7 @@ package org.opensearch.indexmanagement.indexstatemanagement
 
 import org.apache.http.entity.ContentType
 import org.apache.http.entity.StringEntity
+import org.junit.Before
 import org.opensearch.OpenSearchParseException
 import org.opensearch.action.ActionRequest
 import org.opensearch.action.ActionResponse
@@ -54,6 +55,7 @@ import org.opensearch.indexmanagement.indexstatemanagement.model.Policy
 import org.opensearch.indexmanagement.indexstatemanagement.model.managedindexmetadata.PolicyRetryInfoMetaData
 import org.opensearch.indexmanagement.indexstatemanagement.model.managedindexmetadata.StateMetaData
 import org.opensearch.indexmanagement.indexstatemanagement.resthandler.RestExplainAction
+import org.opensearch.indexmanagement.indexstatemanagement.settings.ManagedIndexSettings
 import org.opensearch.indexmanagement.indexstatemanagement.transport.action.explain.ExplainAction
 import org.opensearch.indexmanagement.indexstatemanagement.transport.action.explain.TransportExplainAction
 import org.opensearch.indexmanagement.indexstatemanagement.transport.action.updateindexmetadata.TransportUpdateManagedIndexMetaDataAction
@@ -73,6 +75,11 @@ import java.time.Duration
 import java.time.Instant
 
 abstract class IndexStateManagementIntegTestCase : OpenSearchIntegTestCase() {
+    @Before
+    fun disableIndexStateManagementJitter() {
+        // jitter would add a test-breaking delay to the integration tests
+        updateIndexStateManagementJitterSetting(0.0)
+    }
 
     protected val isMixedNodeRegressionTest = System.getProperty("cluster.mixed", "false")!!.toBoolean()
 
@@ -357,4 +364,8 @@ abstract class IndexStateManagementIntegTestCase : OpenSearchIntegTestCase() {
         )
         assertEquals("Request failed", RestStatus.OK, res.restStatus())
     }
+
+    protected fun updateIndexStateManagementJitterSetting(value: Double?) {
+        updateClusterSetting(ManagedIndexSettings.JITTER.key, value.toString(), false)
+    }
 }

src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/IndexStateManagementRestTestCase.kt

@@ -31,6 +31,7 @@ import org.apache.http.HttpHeaders
 import org.apache.http.entity.ContentType.APPLICATION_JSON
 import org.apache.http.entity.StringEntity
 import org.apache.http.message.BasicHeader
+import org.junit.Before
 import org.opensearch.OpenSearchParseException
 import org.opensearch.action.get.GetResponse
 import org.opensearch.action.search.SearchResponse
@@ -95,6 +96,12 @@ abstract class IndexStateManagementRestTestCase : IndexManagementRestTestCase()
     val explainResponseOpendistroPolicyIdSetting = "index.opendistro.index_state_management.policy_id"
     val explainResponseOpenSearchPolicyIdSetting = "index.plugins.index_state_management.policy_id"
 
+    @Before
+    protected fun disableIndexStateManagementJitter() {
+        // jitter would add a test-breaking delay to the integration tests
+        updateIndexStateManagementJitterSetting(0.0)
+    }
+
     protected fun createPolicy(
         policy: Policy,
         policyId: String = OpenSearchTestCase.randomAlphaOfLength(10),
@@ -268,6 +275,10 @@ abstract class IndexStateManagementRestTestCase : IndexManagementRestTestCase()
         assertEquals("Request failed", RestStatus.OK, res.restStatus())
     }
 
+    protected fun updateIndexStateManagementJitterSetting(value: Double) {
+        updateClusterSetting(ManagedIndexSettings.JITTER.key, value.toString(), false)
+    }
+
     protected fun updateIndexSetting(
         index: String,
         key: String,

src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/MetadataRegressionIT.kt

@@ -63,6 +63,7 @@ class MetadataRegressionIT : IndexStateManagementIntegTestCase() {
     fun cleanClusterSetting() {
         // need to clean up otherwise will throw error
         updateClusterSetting(ManagedIndexSettings.METADATA_SERVICE_ENABLED.key, null, false)
+        updateIndexStateManagementJitterSetting(null)
     }
 
     fun `test move metadata service`() {

src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/TestHelpers.kt

@@ -275,7 +275,8 @@ fun randomManagedIndexConfig(
     enabledTime: Instant? = if (enabled) Instant.now().truncatedTo(ChronoUnit.MILLIS) else null,
     policyID: String = OpenSearchRestTestCase.randomAlphaOfLength(10),
     policy: Policy? = randomPolicy(),
-    changePolicy: ChangePolicy? = randomChangePolicy()
+    changePolicy: ChangePolicy? = randomChangePolicy(),
+    jitter: Double? = 0.0
 ): ManagedIndexConfig {
     return ManagedIndexConfig(
         jobName = name,
@@ -289,7 +290,8 @@ fun randomManagedIndexConfig(
         policySeqNo = policy?.seqNo,
         policyPrimaryTerm = policy?.primaryTerm,
         policy = policy?.copy(seqNo = SequenceNumbers.UNASSIGNED_SEQ_NO, primaryTerm = SequenceNumbers.UNASSIGNED_PRIMARY_TERM),
-        changePolicy = changePolicy
+        changePolicy = changePolicy,
+        jobJitter = jitter
     )
 }
 

src/test/kotlin/org/opensearch/indexmanagement/indexstatemanagement/coordinator/ManagedIndexCoordinatorTests.kt

@@ -78,6 +78,7 @@ class ManagedIndexCoordinatorTests : OpenSearchAllocationTestCase() {
         val settingSet = hashSetOf<Setting<*>>()
         settingSet.addAll(ClusterSettings.BUILT_IN_CLUSTER_SETTINGS)
         settingSet.add(ManagedIndexSettings.SWEEP_PERIOD)
+        settingSet.add(ManagedIndexSettings.JITTER)
         settingSet.add(ManagedIndexSettings.JOB_INTERVAL)
         settingSet.add(ManagedIndexSettings.INDEX_STATE_MANAGEMENT_ENABLED)
         settingSet.add(ManagedIndexSettings.METADATA_SERVICE_ENABLED)