# Getting issues with Java heap on Elasticsearch **URL:** \ **Category:** Elasticsearch\ **Created:** [July 2, 2020, 1:53pm UTC](https://discuss.elastic.co/t/getting-issues-with-java-heap-on-elasticsearch/239649 "2020-07-02T13:53:09Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![AshokBachchan](https://avatars.discourse-cdn.com/v4/letter/a/a587f6/32.png) [@AshokBachchan](https://discuss.elastic.co/u/AshokBachchan)\ **Post date:** [July 2, 2020, 1:53pm UTC](https://discuss.elastic.co/t/getting-issues-with-java-heap-on-elasticsearch/239649/1 "2020-07-02T13:53:09Z")
Hello @matw We have facing issue with elasticsearch, suddenly master nodes getting down. Logs were showing Java OutOfMemoryError. Master nodes have r5.xlarge instance type (4 Core CPU, 32 GB RAM), I have configured 15GB Java heap for this node. Please help on this. ![image](https://us1.discourse-cdn.com/elastic/original/3X/a/9/a93a12377065aa7f9d85db0f4920ede5db10d4d9.png) ---
**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:** [July 2, 2020, 1:56pm UTC](https://discuss.elastic.co/t/getting-issues-with-java-heap-on-elasticsearch/239649/2 "2020-07-02T13:56:47Z")
How large is the cluster? How much data do you have in it? How many indices and shards do you have? What load is the cluster under? ---
**Author:** ![AshokBachchan](https://avatars.discourse-cdn.com/v4/letter/a/a587f6/32.png) [@AshokBachchan](https://discuss.elastic.co/u/AshokBachchan)\ **Post date:** [July 2, 2020, 2:18pm UTC](https://discuss.elastic.co/t/getting-issues-with-java-heap-on-elasticsearch/239649/3 "2020-07-02T14:18:42Z")
We have **13 nodes** in cluster, in which **2** Coord's & **3** Masters and **8** Datanodes. ES cluster have **3800 shards.** Coordinator & Master node have 4 Core-CPU and 32 GB RAM Datanodes have 8 Core-CPU & 64 GB RAM. each datanode have 2.7 TB. 80% disk usage on all datanodes. ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [July 2, 2020, 2:29pm UTC](https://discuss.elastic.co/t/getting-issues-with-java-heap-on-elasticsearch/239649/4 "2020-07-02T14:29:41Z")
Please don't post images of text as they are hard to read, may not display correctly for everyone, and are not searchable. Instead, paste the text and format it with `` icon or pairs of triple backticks (```), and check the preview window to make sure it's properly formatted before posting it. This makes it more likely that your question will receive a useful answer. Also please don't ping people who are not yet involved in your question. ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [July 2, 2020, 2:30pm UTC](https://discuss.elastic.co/t/getting-issues-with-java-heap-on-elasticsearch/239649/5 "2020-07-02T14:30:34Z")
Which version? ---
**Author:** ![AshokBachchan](https://avatars.discourse-cdn.com/v4/letter/a/a587f6/32.png) [@AshokBachchan](https://discuss.elastic.co/u/AshokBachchan)\ **Post date:** [July 2, 2020, 2:34pm UTC](https://discuss.elastic.co/t/getting-issues-with-java-heap-on-elasticsearch/239649/6 "2020-07-02T14:34:47Z")
**Hello david,** We are using 5.6.4 version below errors we are getting ```auto at org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:74) [transport-netty4-5.6.4.jar:5.6.4] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310) [netty-codec-4.1.13.Final.jar:4.1.13.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:297) [netty-codec-4.1.13.Final.jar:4.1.13.Final] at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:413) [netty-codec-4.1.13.Final.jar:4.1.13.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265) [netty-codec-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:241) [netty-handler-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1334) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:926) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:134) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:544) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:498) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [netty-common-4.1.13.Final.jar:4.1.13.Final] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191] [2020-07-02T05:57:07,493][WARN][i.n.u.c.DefaultPromise] An exception was thrown by org.elasticsearch.transport.netty4.Netty4Transport$$Lambda$1415/1480775775.operationComplete() java.lang.ClassCastException: java.lang.OutOfMemoryError cannot be cast to java.lang.Exception at org.elasticsearch.transport.netty4.Netty4Transport.lambda$sendMessage$4(Netty4Transport.java:406) ~[transport-netty4-5.6.4.jar:5.6.4] at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:507) [netty-common-4.1.13.Final.jar:4.1.13.Final] at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:481) [netty-common-4.1.13.Final.jar:4.1.13.Final] at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:420) [netty-common-4.1.13.Final.jar:4.1.13.Final] at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:163) [netty-common-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:93) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:28) [netty-transport-4.1.13.Final.jar:4.1.13.Final] at org.elasticsearch.transport.netty4.Netty4Transport.sendMessage(Netty4Transport.java:397) [transport-netty4-5.6.4.jar:5.6.4] at org.elasticsearch.transport.netty4.Netty4Transport.sendMessage(Netty4Transport.java:95) [transport-netty4-5.6.4.jar:5.6.4] at org.elasticsearch.transport.TcpTransport.internalSendMessage(TcpTransport.java:1135) [elasticsearch-5.6.4.jar:5.6.4] at org.elasticsearch.transport.TcpTransport.sendResponse(TcpTransport.java:1205) [elasticsearch-5.6.4.jar:5.6.4] at org.elasticsearch.transport.TcpTransport.sendResponse(TcpTransport.java:1178) [elasticsearch-5.6.4.jar:5.6.4] at org.elasticsearch.transport.TcpTransportChannel.sendResponse(TcpTransportChannel.java:67) [elasticsearch-5.6.4.jar:5.6.4] ``` ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [July 2, 2020, 4:14pm UTC](https://discuss.elastic.co/t/getting-issues-with-java-heap-on-elasticsearch/239649/7 "2020-07-02T16:14:42Z")
This is a way too old. At the very update to latest 5.x version. But you should really upgrade to 6.8 or better 7.8 and upgrade also you java version. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 30, 2020, 4:14pm UTC](https://discuss.elastic.co/t/getting-issues-with-java-heap-on-elasticsearch/239649/8 "2020-07-30T16:14:53Z")
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