# High CPU on Elasticsearch for single node **URL:** \ **Category:** Elasticsearch\ **Created:** [August 7, 2020, 6:47am UTC](https://discuss.elastic.co/t/high-cpu-on-elasticsearch-for-single-node/244126 "2020-08-07T06:47:55Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![karthik8890](https://avatars.discourse-cdn.com/v4/letter/k/ce7236/32.png) [@karthik8890](https://discuss.elastic.co/u/karthik8890)\ **Post date:** [August 7, 2020, 6:47am UTC](https://discuss.elastic.co/t/high-cpu-on-elasticsearch-for-single-node/244126/1 "2020-08-07T06:47:55Z")
Elasticsearch version : 6.8.9 JDK : 8 RAM : 8GB JVM arguments: -Xms4g -Xmx4g and the remaining are default configurations provided by package. CPU utilization is going more than 90% and also high response time taking for simple search queries also. Captured the below logs during the search load, unable to understand how to resolve the issue. 37.2% (186.1ms out of 500ms) cpu usage by thread 'elasticsearch[uyHufGe][http\_server\_worker][T#3]' 2/10 snapshots sharing following 36 elements java.math.BigInteger.oddModPow(BigInteger.java:2941) java.math.BigInteger.modPow(BigInteger.java:2603) sun.security.rsa.RSACore.crtCrypt(RSACore.java:185) sun.security.rsa.RSACore.rsa(RSACore.java:122) sun.security.rsa.RSASignature.engineSign(RSASignature.java:192) java.security.Signature$Delegate.engineSign(Signature.java:1382) java.security.Signature.sign(Signature.java:698) sun.security.ssl.HandshakeMessage$ECDH\_ServerKeyExchange.(HandshakeMessage.java:1041) sun.security.ssl.ServerHandshaker.clientHello(ServerHandshaker.java:1053) sun.security.ssl.ServerHandshaker.processMessage(ServerHandshaker.java:222) sun.security.ssl.Handshaker.processLoop(Handshaker.java:1082) sun.security.ssl.Handshaker$1.run(Handshaker.java:1015) sun.security.ssl.Handshaker$1.run(Handshaker.java:1012) java.security.AccessController.doPrivileged(Native Method) sun.security.ssl.Handshaker$DelegatedTask.run(Handshaker.java:1520) io.netty.handler.ssl.SslHandler.runDelegatedTasks(SslHandler.java:1464) io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1369) io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1203) io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1247) io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:502) io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:441) io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:278) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:656) io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:556) io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:510) io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:470) io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909) java.lang.Thread.run(Thread.java:748) 2/10 snapshots sharing following 34 elements sun.security.ec.ECDHKeyAgreement.deriveKeyImpl(ECDHKeyAgreement.java:239) sun.security.ec.ECDHKeyAgreement.engineGenerateSecret(ECDHKeyAgreement.java:169) sun.security.ec.ECDHKeyAgreement.engineGenerateSecret(ECDHKeyAgreement.java:202) javax.crypto.KeyAgreement.generateSecret(KeyAgreement.java:648) sun.security.ssl.ECDHCrypt.getAgreedSecret(ECDHCrypt.java:102) sun.security.ssl.ECDHCrypt.getAgreedSecret(ECDHCrypt.java:120) sun.security.ssl.ServerHandshaker.clientKeyExchange(ServerHandshaker.java:1771) sun.security.ssl.ServerHandshaker.processMessage(ServerHandshaker.java:287) sun.security.ssl.Handshaker.processLoop(Handshaker.java:1082) sun.security.ssl.Handshaker$1.run(Handshaker.java:1015) sun.security.ssl.Handshaker$1.run(Handshaker.java:1012) java.security.AccessController.doPrivileged(Native Method) sun.security.ssl.Handshaker$DelegatedTask.run(Handshaker.java:1520) io.netty.handler.ssl.SslHandler.runDelegatedTasks(SslHandler.java:1464) io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1369) io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1203) io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1247) io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:502) io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:441) io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:278) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:656) io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:556) io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:510) io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:470) io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909) java.lang.Thread.run(Thread.java:748) 2/10 snapshots sharing following 23 elements java.security.AccessController.doPrivileged(Native Method) sun.security.ssl.Handshaker$DelegatedTask.run(Handshaker.java:1520) io.netty.handler.ssl.SslHandler.runDelegatedTasks(SslHandler.java:1464) io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1369) io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1203) io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1247) io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:502) io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:441) io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:278) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:656) io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:556) io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:510) io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:470) io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909) java.lang.Thread.run(Thread.java:748) ---
**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\ **Post date:** [August 7, 2020, 2:08pm UTC](https://discuss.elastic.co/t/high-cpu-on-elasticsearch-for-single-node/244126/2 "2020-08-07T14:08:24Z")
Seems related to SSL. What does your node config look like? How have you configured security? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [September 4, 2020, 2:08pm UTC](https://discuss.elastic.co/t/high-cpu-on-elasticsearch-for-single-node/244126/3 "2020-09-04T14:08:37Z")
Closed on September 4, 2020, 2:08pm UTC This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.