# Thread Pool Management **URL:** \ **Category:** Elasticsearch\ **Created:** [November 3, 2021, 12:33am UTC](https://discuss.elastic.co/t/thread-pool-management/288275 "2021-11-03T00:33:34Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![tsousahs](https://avatars.discourse-cdn.com/v4/letter/t/41988e/32.png) [@tsousahs](https://discuss.elastic.co/u/tsousahs)\ **Post date:** [November 3, 2021, 12:33am UTC](https://discuss.elastic.co/t/thread-pool-management/288275/1 "2021-11-03T00:33:34Z")
Hello, We are seeing a lot of CPU processing without much indexing activity. I have run the following command to see the hot thread: ```auto GET _nodes/hot_threads ``` which i got the following output. ```auto 100.5% (502.6ms out of 500ms) cpu usage by thread 'elasticsearch[helasticsearch001][management][T#4]' 4/10 snapshots sharing following 32 elements app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readValueUnsafe(AbstractXContentParser.java:387) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readMapEntries(AbstractXContentParser.java:316) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readValueUnsafe(AbstractXContentParser.java:387) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readMapEntries(AbstractXContentParser.java:316) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readValueUnsafe(AbstractXContentParser.java:387) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readMapEntries(AbstractXContentParser.java:316) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readValueUnsafe(AbstractXContentParser.java:387) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readMapEntries(AbstractXContentParser.java:316) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readValueUnsafe(AbstractXContentParser.java:387) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readMapEntries(AbstractXContentParser.java:316) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readValueUnsafe(AbstractXContentParser.java:387) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readMapEntries(AbstractXContentParser.java:316) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.readMapSafe(AbstractXContentParser.java:305) app//org.elasticsearch.common.xcontent.support.AbstractXContentParser.mapOrdered(AbstractXContentParser.java:260) app//org.elasticsearch.common.xcontent.XContentHelper.convertToMap(XContentHelper.java:158) app//org.elasticsearch.common.xcontent.XContentHelper.convertToMap(XContentHelper.java:128) app//org.elasticsearch.common.xcontent.XContentHelper.convertToMap(XContentHelper.java:90) app//org.elasticsearch.cluster.metadata.MappingMetadata.sourceAsMap(MappingMetadata.java:137) app//org.elasticsearch.action.admin.indices.mapping.get.GetMappingsResponse.toXContent(GetMappingsResponse.java:124) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$1.buildResponse(RestGetMappingAction.java:168) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$1.buildResponse(RestGetMappingAction.java:117) app//org.elasticsearch.rest.action.RestBuilderListener.buildResponse(RestBuilderListener.java:27) app//org.elasticsearch.rest.action.RestResponseListener.processResponse(RestResponseListener.java:26) app//org.elasticsearch.rest.action.RestActionListener.onResponse(RestActionListener.java:36) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1.lambda$processResponse$0(RestGetMappingAction.java:174) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$$Lambda$8662/0x0000000801e7b8d8.accept(Unknown Source) app//org.elasticsearch.action.ActionRunnable$2.doRun(ActionRunnable.java:62) app//org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:732) app//org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26) java.base@16/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) java.base@16/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) java.base@16/java.lang.Thread.run(Thread.java:831) 2/10 snapshots sharing following 28 elements app//org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:814) app//org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:887) app//org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:814) app//org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:887) app//org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:814) app//org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:887) app//org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:814) app//org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:887) app//org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:814) app//org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:887) app//org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:814) app//org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:887) app//org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:862) app//org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:858) app//org.elasticsearch.action.admin.indices.mapping.get.GetMappingsResponse.toXContent(GetMappingsResponse.java:124) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$1.buildResponse(RestGetMappingAction.java:168) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$1.buildResponse(RestGetMappingAction.java:117) app//org.elasticsearch.rest.action.RestBuilderListener.buildResponse(RestBuilderListener.java:27) app//org.elasticsearch.rest.action.RestResponseListener.processResponse(RestResponseListener.java:26) app//org.elasticsearch.rest.action.RestActionListener.onResponse(RestActionListener.java:36) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1.lambda$processResponse$0(RestGetMappingAction.java:174) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$$Lambda$8662/0x0000000801e7b8d8.accept(Unknown Source) app//org.elasticsearch.action.ActionRunnable$2.doRun(ActionRunnable.java:62) app//org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:732) app//org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26) java.base@16/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) java.base@16/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) java.base@16/java.lang.Thread.run(Thread.java:831) 2/10 snapshots sharing following 25 elements app//org.elasticsearch.common.xcontent.XContentBuilder.ensureNoSelfReferences(XContentBuilder.java:1052) app//org.elasticsearch.common.xcontent.XContentBuilder.ensureNoSelfReferences(XContentBuilder.java:1053) app//org.elasticsearch.common.xcontent.XContentBuilder.ensureNoSelfReferences(XContentBuilder.java:1053) app//org.elasticsearch.common.xcontent.XContentBuilder.ensureNoSelfReferences(XContentBuilder.java:1053) app//org.elasticsearch.common.xcontent.XContentBuilder.ensureNoSelfReferences(XContentBuilder.java:1053) app//org.elasticsearch.common.xcontent.XContentBuilder.ensureNoSelfReferences(XContentBuilder.java:1053) app//org.elasticsearch.common.xcontent.XContentBuilder.ensureNoSelfReferences(XContentBuilder.java:1053) app//org.elasticsearch.common.xcontent.XContentBuilder.ensureNoSelfReferences(XContentBuilder.java:1028) app//org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:878) app//org.elasticsearch.common.xcontent.XContentBuilder.map(XContentBuilder.java:862) app//org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:858) app//org.elasticsearch.action.admin.indices.mapping.get.GetMappingsResponse.toXContent(GetMappingsResponse.java:124) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$1.buildResponse(RestGetMappingAction.java:168) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$1.buildResponse(RestGetMappingAction.java:117) app//org.elasticsearch.rest.action.RestBuilderListener.buildResponse(RestBuilderListener.java:27) app//org.elasticsearch.rest.action.RestResponseListener.processResponse(RestResponseListener.java:26) app//org.elasticsearch.rest.action.RestActionListener.onResponse(RestActionListener.java:36) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1.lambda$processResponse$0(RestGetMappingAction.java:174) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$$Lambda$8662/0x0000000801e7b8d8.accept(Unknown Source) app//org.elasticsearch.action.ActionRunnable$2.doRun(ActionRunnable.java:62) app//org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:732) app//org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26) java.base@16/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) java.base@16/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) java.base@16/java.lang.Thread.run(Thread.java:831) 2/10 snapshots sharing following 14 elements app//org.elasticsearch.action.admin.indices.mapping.get.GetMappingsResponse.toXContent(GetMappingsResponse.java:124) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$1.buildResponse(RestGetMappingAction.java:168) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$1.buildResponse(RestGetMappingAction.java:117) app//org.elasticsearch.rest.action.RestBuilderListener.buildResponse(RestBuilderListener.java:27) app//org.elasticsearch.rest.action.RestResponseListener.processResponse(RestResponseListener.java:26) app//org.elasticsearch.rest.action.RestActionListener.onResponse(RestActionListener.java:36) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1.lambda$processResponse$0(RestGetMappingAction.java:174) app//org.elasticsearch.rest.action.admin.indices.RestGetMappingAction$1$$Lambda$8662/0x0000000801e7b8d8.accept(Unknown Source) app//org.elasticsearch.action.ActionRunnable$2.doRun(ActionRunnable.java:62) app//org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:732) app//org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26) java.base@16/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) java.base@16/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) java.base@16/java.lang.Thread.run(Thread.java:831) ``` What is the reference to _AbstractXContentParser_ mean? Is it a index mapping inefficiency? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 1, 2021, 12:33am UTC](https://discuss.elastic.co/t/thread-pool-management/288275/2 "2021-12-01T00:33:45Z")
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