# How to optimize memory and heap usage for Single node Elastic Search **URL:** \ **Category:** Elasticsearch\ **Created:** [October 19, 2020, 7:48am UTC](https://discuss.elastic.co/t/how-to-optimize-memory-and-heap-usage-for-single-node-elastic-search/252492 "2020-10-19T07:48:13Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![avadhut](https://avatars.discourse-cdn.com/v4/letter/a/838e76/32.png) [@avadhut](https://discuss.elastic.co/u/avadhut)\ **Post date:** [October 19, 2020, 7:48am UTC](https://discuss.elastic.co/t/how-to-optimize-memory-and-heap-usage-for-single-node-elastic-search/252492/1 "2020-10-19T07:48:13Z")
Hi everyone, I have set up a single node latest version elasticsearch cluster with Xpack and Kibana UI on the same VM. The VM has 23 GB RAM. I have provided 12 GB of JAVA heap space. But still, elastic search uses all of VM's RAM and shuts down constantly after starting for heap space error or OutOFMemory error. We have logs coming from K8s Cluster using Rancher (fluentd pods). It is creating a daily new shard. can we set some config where it clears the memory/heap if it's almost completely filled to prevent crashing? 1. Why elasticsearch is using all the RAM of VM even though only 12 GB of heap space is allocated? 2. Why it is taking 15-20 minutes to stop the elastic service? 3. How can I reduce its memory consumption? 4. How can I reduce the load on elastic search incoming data? Need help in creating a setup that will be up all the time. ---
**Author:** ![spinscale](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/spinscale/32/25011_2.png) [@spinscale](https://discuss.elastic.co/u/spinscale)\ **Post date:** [October 19, 2020, 11:33am UTC](https://discuss.elastic.co/t/how-to-optimize-memory-and-heap-usage-for-single-node-elastic-search/252492/2 "2020-10-19T11:33:22Z")
Without describing your deployment it is pretty much impossible to help. Version of the cluster, number of nodes, indices, shards, type of workload, type of queries, type of documents, mapping configurations, java versions. Also the [nodes info](https://www.elastic.co/guide/en/elasticsearch/reference/7.9/cluster-nodes-info.html) and the [nodes stats API](https://www.elastic.co/guide/en/elasticsearch/reference/7.9/cluster-nodes-stats.html) might be a good indicator for first look where your memory goes. ---
**Author:** ![avadhut](https://avatars.discourse-cdn.com/v4/letter/a/838e76/32.png) [@avadhut](https://discuss.elastic.co/u/avadhut)\ **Post date:** [October 19, 2020, 12:42pm UTC](https://discuss.elastic.co/t/how-to-optimize-memory-and-heap-usage-for-single-node-elastic-search/252492/3 "2020-10-19T12:42:57Z")
Thanks for the reply. I have a single node Cluster. Version: 7.9.2 java version: OpenJDK version "1.8.0\_262" It is getting logs from the Kubernetes cluster. I have Rancher setup on Kubernetes, sending logs. It creates a new index daily. I don't think data is more than 3 GBs. I am running queries on Kibana UI, to search logs. I used filters from available fields. It is mostly OutOfMemory error. Is there any configuration where it will clear the memory and heapspace after reaching a limit ? ---
**Author:** ![avadhut](https://avatars.discourse-cdn.com/v4/letter/a/838e76/32.png) [@avadhut](https://discuss.elastic.co/u/avadhut)\ **Post date:** [October 19, 2020, 2:34pm UTC](https://discuss.elastic.co/t/how-to-optimize-memory-and-heap-usage-for-single-node-elastic-search/252492/4 "2020-10-19T14:34:21Z")
Node stats are here on this link: > **[Pastebin.com - Potentially offensive content ahead!](https://pastebin.com/LeGdpYDk)** > > Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time. ``` { "_nodes" : { "total" : 1, "successful" : 1, "failed" : 0 }, "cluster_name" : "elasticsearch", "nodes" : { "ZrjMu9DxSRWTePsJ_S63kg" : { "timestamp" : 1603116851336, "name" : "xxxxxxxxxx", "transport_address" : "192.168.x.x:9300", "host" : "192.168.x.x", "ip" : "192.168x.x:9300", "roles" : [ "data", "ingest", "master", "remote_cluster_client", "transform" ], "attributes" : { "xpack.installed" : "true", "transform.node" : "true" }, "indices" : { "docs" : { "count" : 2100234, "deleted" : 57 }, "store" : { "size_in_bytes" : 831176128, "reserved_in_bytes" : 0 }, "indexing" : { "index_total" : 186872, "index_time_in_millis" : 17329, "index_current" : 0, "index_failed" : 0, "delete_total" : 1, "delete_time_in_millis" : 4, "delete_current" : 0, "noop_update_total" : 0, "is_throttled" : false, "throttle_time_in_millis" : 0 }, "get" : { "total" : 144, "time_in_millis" : 229, "exists_total" : 136, "exists_time_in_millis" : 228, "missing_total" : 8, "missing_time_in_millis" : 1, "current" : 0 }, "search" : { "open_contexts" : 0, "query_total" : 220, "query_time_in_millis" : 778, "query_current" : 0, "fetch_total" : 216, "fetch_time_in_millis" : 921, "fetch_current" : 0, "scroll_total" : 160, "scroll_time_in_millis" : 2443, "scroll_current" : 0, "suggest_total" : 0, "suggest_time_in_millis" : 0, "suggest_current" : 0 }, "merges" : { "current" : 0, "current_docs" : 0, "current_size_in_bytes" : 0, "total" : 5, "total_time_in_millis" : 11097, "total_docs" : 282309, "total_size_in_bytes" : 99722168, "total_stopped_time_in_millis" : 0, "total_throttled_time_in_millis" : 3164, "total_auto_throttle_in_bytes" : 207808698 }, "refresh" : { "total" : 78, "total_time_in_millis" : 4639, "external_total" : 76, "external_total_time_in_millis" : 4527, "listeners" : 0 }, "flush" : { "total" : 6, "periodic" : 0, "total_time_in_millis" : 0 }, "warmer" : { "current" : 0, "total" : 64, "total_time_in_millis" : 22 }, "query_cache" : { "memory_size_in_bytes" : 0, "total_count" : 33, "hit_count" : 0, "miss_count" : 33, "cache_size" : 0, "cache_count" : 0, "evictions" : 0 }, "fielddata" : { "memory_size_in_bytes" : 0, "evictions" : 0 }, "completion" : { "size_in_bytes" : 0 }, "segments" : { "count" : 58, "memory_in_bytes" : 438592, "terms_memory_in_bytes" : 342400, "stored_fields_memory_in_bytes" : 40720, "term_vectors_memory_in_bytes" : 0, "norms_memory_in_bytes" : 43392, "points_memory_in_bytes" : 0, "doc_values_memory_in_bytes" : 12080, "index_writer_memory_in_bytes" : 11918836, "version_map_memory_in_bytes" : 0, "fixed_bit_set_memory_in_bytes" : 640, "max_unsafe_auto_id_timestamp" : 1603115423735, "file_sizes" : { } }, "translog" : { "operations" : 186873, "size_in_bytes" : 209986002, "uncommitted_operations" : 186873, "uncommitted_size_in_bytes" : 209986002, "earliest_last_modified_age" : 0 }, "request_cache" : { "memory_size_in_bytes" : 19986, "evictions" : 0, "hit_count" : 6, "miss_count" : 2 }, "recovery" : { "current_as_source" : 0, "current_as_target" : 0, "throttle_time_in_millis" : 0 } }, "os" : { "timestamp" : 1603116851348, "cpu" : { "percent" : 1, "load_average" : { "1m" : 0.17, "5m" : 0.39, "15m" : 0.89 } }, "mem" : { "total_in_bytes" : 25092276224, "free_in_bytes" : 773218304, "used_in_bytes" : 24319057920, "free_percent" : 3, "used_percent" : 97 }, "swap" : { "total_in_bytes" : 0, "free_in_bytes" : 0, "used_in_bytes" : 0 }, "cgroup" : { "cpuacct" : { "control_group" : "/", "usage_nanos" : 4487256782666 }, "cpu" : { "control_group" : "/", "cfs_period_micros" : 100000, "cfs_quota_micros" : -1, "stat" : { "number_of_elapsed_periods" : 0, "number_of_times_throttled" : 0, "time_throttled_nanos" : 0 } }, "memory" : { "control_group" : "/", "limit_in_bytes" : "9223372036854771712", "usage_in_bytes" : "23622434816" } } }, "process" : { "timestamp" : 1603116851348, "open_file_descriptors" : 322, "max_file_descriptors" : 65535, "cpu" : { "percent" : 1, "total_in_millis" : 142660 }, "mem" : { "total_virtual_in_bytes" : 20090822656 } }, "jvm" : { "timestamp" : 1603116851349, "uptime_in_millis" : 506828, "mem" : { "heap_used_in_bytes" : 7357687296, "heap_used_percent" : 57, "heap_committed_in_bytes" : 12884901888, "heap_max_in_bytes" : 12884901888, "non_heap_used_in_bytes" : 155401240, "non_heap_committed_in_bytes" : 163594240, "pools" : { "young" : { "used_in_bytes" : 5511315456, "max_in_bytes" : 0, "peak_used_in_bytes" : 5511315456, "peak_max_in_bytes" : 0 }, "old" : { "used_in_bytes" : 1594713600, "max_in_bytes" : 12884901888, "peak_used_in_bytes" : 1594713600, "peak_max_in_bytes" : 12884901888 }, "survivor" : { "used_in_bytes" : 251658240, "max_in_bytes" : 0, "peak_used_in_bytes" : 251658240, "peak_max_in_bytes" : 0 } } }, "threads" : { "count" : 79, "peak_count" : 87 }, "gc" : { "collectors" : { "young" : { "collection_count" : 14, "collection_time_in_millis" : 295 }, "old" : { "collection_count" : 0, "collection_time_in_millis" : 0 } } }, "buffer_pools" : { "mapped" : { "count" : 98, "used_in_bytes" : 543093083, "total_capacity_in_bytes" : 543093083 }, "direct" : { "count" : 53, "used_in_bytes" : 8676189, "total_capacity_in_bytes" : 8676188 }, "mapped - 'non-volatile memory'" : { "count" : 0, "used_in_bytes" : 0, "total_capacity_in_bytes" : 0 } }, "classes" : { "current_loaded_count" : 20888, "total_loaded_count" : 20888, "total_unloaded_count" : 0 } }, "thread_pool" : { "analyze" : { "threads" : 0, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 0, "completed" : 0 }, "ccr" : { "threads" : 0, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 0, "completed" : 0 }, "fetch_shard_started" : { "threads" : 1, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 10, "completed" : 10 }, "fetch_shard_store" : { "threads" : 0, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 0, "completed" : 0 }, "flush" : { "threads" : 3, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 3, "completed" : 8 }, "force_merge" : { "threads" : 0, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 0, "completed" : 0 }, "generic" : { "threads" : 5, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 5, "completed" : 542 }, "get" : { "threads" : 8, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 8, "completed" : 114 }, "listener" : { "threads" : 0, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 0, "completed" : 0 }, "management" : { "threads" : 5, "queue" : 0, "active" : 1, "rejected" : 0, "largest" : 5, "completed" : 706 }, "refresh" : { "threads" : 4, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 4, "completed" : 4859 }, "rollup_indexing" : { "threads" : 0, "queue" : 0, "active" : 0, "rejected" : 0, "largest" : 0, "completed" : 0 }, ``` ---
**Author:** ![spinscale](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/spinscale/32/25011_2.png) [@spinscale](https://discuss.elastic.co/u/spinscale)\ **Post date:** [October 21, 2020, 7:53am UTC](https://discuss.elastic.co/t/how-to-optimize-memory-and-heap-usage-for-single-node-elastic-search/252492/5 "2020-10-21T07:53:33Z")
this does not look like a system under stress at first... also please use the [human parameter](https://www.elastic.co/guide/en/elasticsearch/reference/7.9/common-options.html#_human_readable_output) when sharing this kind of output as it is much easier to read The amount of data is indeed rather low. Can you share the out of memory exception from the logs? Also, nodes stats/nodes info API with the human parameter would be nice. ---
**Author:** ![avadhut](https://avatars.discourse-cdn.com/v4/letter/a/838e76/32.png) [@avadhut](https://discuss.elastic.co/u/avadhut)\ **Post date:** [October 23, 2020, 6:30am UTC](https://discuss.elastic.co/t/how-to-optimize-memory-and-heap-usage-for-single-node-elastic-search/252492/6 "2020-10-23T06:30:24Z")
ok. This was the error Caused by: java.lang.OutOfMemoryError: Java heap space at io.netty.util.internal.PlatformDependent.allocateUninitializedArray(PlatformDependent.java:281) ~[?:?] at io.netty.buffer.PoolArena$HeapArena.newByteArray(PoolArena.java:662) ~[?:?] at io.netty.buffer.PoolArena$HeapArena.newChunk(PoolArena.java:672) ~[?:?] at io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:247) ~[?:?] at io.netty.buffer.PoolArena.allocate(PoolArena.java:227) ~[?:?] at io.netty.buffer.PoolArena.allocate(PoolArena.java:147) ~[?:?] at io.netty.buffer.PooledByteBufAllocator.newHeapBuffer(PooledByteBufAllocator.java:339) ~[?:?] at io.netty.buffer.AbstractByteBufAllocator.heapBuffer(AbstractByteBufAllocator.java:168) ~[?:?] at io.netty.buffer.AbstractByteBufAllocator.heapBuffer(AbstractByteBufAllocator.java:159) ~[?:?] at org.elasticsearch.transport.NettyAllocator$NoDirectBuffers.heapBuffer(NettyAllocator.java:137) ~[?:?] at org.elasticsearch.transport.NettyAllocator$NoDirectBuffers.ioBuffer(NettyAllocator.java:122) ~[?:?] at io.netty.channel.DefaultMaxMessagesRecvByteBufAllocator$MaxMessageHandle.allocate(DefaultMaxMessagesRecvByteBufAllocator.java:114) ~[?:?] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:147) ~[?:?] ... 7 more [2020-10-09T21:09:40,259][WARN][o.e.h.AbstractHttpServerTransport] [localhost.localdomain] caught exception while handling client http traffic, closing connection Netty4HttpChannel{localAddress=/192.168.x.x:9200, remoteAddress=/10.x.x.x:55882} java.lang.Exception: java.lang.OutOfMemoryError: Java heap space at org.elasticsearch.http.netty4.Netty4HttpRequestHandler.exceptionCaught(Netty4HttpRequestHandler.java:69) [transport-netty4-client-7.8.0.jar:7.8.0] at io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:302) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:281) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.AbstractChannelHandlerContext.fireExceptionCaught(AbstractChannelHandlerContext.java:273) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.exceptionCaught(DefaultChannelPipeline.java:1377) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:302) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeExceptionCaught(AbstractChannelHandlerContext.java:281) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.DefaultChannelPipeline.fireExceptionCaught(DefaultChannelPipeline.java:907) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.handleReadException(AbstractNioByteChannel.java:125) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:174) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:615) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:578) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) [netty-common-4.1.49.Final.jar:4.1.49.Final] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.49.Final.jar:4.1.49.Final] at java.lang.Thread.run(Thread.java:832) [?:?] Caused by: java.lang.OutOfMemoryError: Java heap space at io.netty.util.internal.PlatformDependent.allocateUninitializedArray(PlatformDependent.java:281) ~[?:?] at io.netty.buffer.PoolArena$HeapArena.newByteArray(PoolArena.java:662) ~[?:?] at io.netty.buffer.PoolArena$HeapArena.newChunk(PoolArena.java:672) ~[?:?] at io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:247) ~[?:?] at io.netty.buffer.PoolArena.allocate(PoolArena.java:227) ~[?:?] at io.netty.buffer.PoolArena.allocate(PoolArena.java:147) ~[?:?] at io.netty.buffer.PooledByteBufAllocator.newHeapBuffer(PooledByteBufAllocator.java:339) ~[?:?] at io.netty.buffer.AbstractByteBufAllocator.heapBuffer(AbstractByteBufAllocator.java:168) ~[?:?] at io.netty.buffer.AbstractByteBufAllocator.heapBuffer(AbstractByteBufAllocator.java:159) ~[?:?] at org.elasticsearch.transport.NettyAllocator$NoDirectBuffers.heapBuffer(NettyAllocator.java:137) ~[?:?] at org.elasticsearch.transport.NettyAllocator$NoDirectBuffers.ioBuffer(NettyAllocator.java:122) ~[?:?] at io.netty.channel.DefaultMaxMessagesRecvByteBufAllocator$MaxMessageHandle.allocate(DefaultMaxMessagesRecvByteBufAllocator.java:114) ~[?:?] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:147) ~[?:?] ... 7 more [2020-10-09T21:09:40,288][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [localhost.localdomain] fatal error in thread [Thread-17], exiting java.lang.OutOfMemoryError: Java heap space at io.netty.util.internal.PlatformDependent.allocateUninitializedArray(PlatformDependent.java:281) ~[?:?] at io.netty.buffer.PoolArena$HeapArena.newByteArray(PoolArena.java:662) ~[?:?] at io.netty.buffer.PoolArena$HeapArena.newChunk(PoolArena.java:672) ~[?:?] at io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:247) ~[?:?] at io.netty.buffer.PoolArena.allocate(PoolArena.java:227) ~[?:?] at io.netty.buffer.PoolArena.allocate(PoolArena.java:147) ~[?:?] at io.netty.buffer.PooledByteBufAllocator.newHeapBuffer(PooledByteBufAllocator.java:339) ~[?:?] at io.netty.buffer.AbstractByteBufAllocator.heapBuffer(AbstractByteBufAllocator.java:168) ~[?:?] at io.netty.buffer.AbstractByteBufAllocator.heapBuffer(AbstractByteBufAllocator.java:159) ~[?:?] at org.elasticsearch.transport.NettyAllocator$NoDirectBuffers.heapBuffer(NettyAllocator.java:137) ~[?:?] at org.elasticsearch.transport.NettyAllocator$NoDirectBuffers.ioBuffer(NettyAllocator.java:122) ~[?:?] at io.netty.channel.DefaultMaxMessagesRecvByteBufAllocator$MaxMessageHandle.allocate(DefaultMaxMessagesRecvByteBufAllocator.java:114) ~[?:?] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:147) ~[?:?] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) ~[?:?] at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:615) ~[?:?] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:578) ~[?:?] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[?:?] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[?:?] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[?:?] at java.lang.Thread.run(Thread.java:832) [?:?] [2020-10-09T21:09:40,288][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [localhost.localdomain] fatal error in thread [Thread-18], exiting java.lang.OutOfMemoryError: Java heap space at io.netty.util.internal.PlatformDependent.allocateUninitializedArray(PlatformDependent.java:281) ~[?:?] at io.netty.buffer.PoolArena$HeapArena.newByteArray(PoolArena.java:662) ~[?:?] at io.netty.buffer.PoolArena$HeapArena.newChunk(PoolArena.java:672) ~[?:?] at io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:247) ~[?:?] at io.netty.buffer.PoolArena.allocate(PoolArena.java:227) ~[?:?] at io.netty.buffer.PoolArena.allocate(PoolArena.java:147) ~[?:?] at io.netty.buffer.PooledByteBufAllocator.newHeapBuffer(PooledByteBufAllocator.java:339) ~[?:?] at io.netty.buffer.AbstractByteBufAllocator.heapBuffer(AbstractByteBufAllocator.java:168) ~[?:?] at io.netty.buffer.AbstractByteBufAllocator.heapBuffer(AbstractByteBufAllocator.java:159) ~[?:?] at org.elasticsearch.transport.NettyAllocator$NoDirectBuffers.heapBuffer(NettyAllocator.java:137) ~[?:?] at org.elasticsearch.transport.NettyAllocator$NoDirectBuffers.ioBuffer(NettyAllocator.java:122) ~[?:?] at io.netty.channel.DefaultMaxMessagesRecvByteBufAllocator$MaxMessageHandle.allocate(DefaultMaxMessagesRecvByteBufAllocator.java:114) ~[?:?] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:147) ~[?:?] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) ~[?:?] at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:615) ~[?:?] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:578) ~[?:?] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[?:?] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[?:?] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[?:?] at java.lang.Thread.run(Thread.java:832) [?:?] ---
**Author:** ![avadhut](https://avatars.discourse-cdn.com/v4/letter/a/838e76/32.png) [@avadhut](https://discuss.elastic.co/u/avadhut)\ **Post date:** [October 23, 2020, 6:32am UTC](https://discuss.elastic.co/t/how-to-optimize-memory-and-heap-usage-for-single-node-elastic-search/252492/7 "2020-10-23T06:32:07Z")
Thanks. Anyway, I decided to go with Docker Compose approach > **[Running the Elastic Stack on Docker | Getting Started \[7.9\] | Elastic](https://www.elastic.co/guide/en/elastic-stack-get-started/current/get-started-docker.html)** This link helped me to create a stable and working cluster. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [November 20, 2020, 6:32am UTC](https://discuss.elastic.co/t/how-to-optimize-memory-and-heap-usage-for-single-node-elastic-search/252492/8 "2020-11-20T06:32:13Z")
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