# \[SOLVED\] Unable to start elasticsearch - could not reserve enough space for object heap

**URL:** <https://discuss.elastic.co/t/solved-unable-to-start-elasticsearch-could-not-reserve-enough-space-for-object-heap/76704>\
**Category:** Elasticsearch\
**Created:** [February 27, 2017, 11:35pm UTC](https://discuss.elastic.co/t/solved-unable-to-start-elasticsearch-could-not-reserve-enough-space-for-object-heap/76704 "2017-02-27T23:35:35Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![AtTheControls](https://avatars.discourse-cdn.com/v4/letter/a/8c91f0/32.png) [@AtTheControls](https://discuss.elastic.co/u/AtTheControls)\
**Post date:** [February 27, 2017, 11:35pm UTC](https://discuss.elastic.co/t/solved-unable-to-start-elasticsearch-could-not-reserve-enough-space-for-object-heap/76704/1 "2017-02-27T23:35:36Z")

</div>

This is driving me insane. I cannot work out why a fresh install of Java 1.8.0\_121 and elasticsearch 5.2.1 is unable to start. I used elasticsearch 2.4 previously without issues, but have since removed it and tidied up my Java versions. Wanted to test out elasticsearch again, installed latest version and latest Java and just can't get it to start.

> java -version  
> java version "1.8.0\_121"  
> Java(TM) SE Runtime Environment (build 1.8.0\_121-b13)  
> Java HotSpot(TM) Client VM (build 25.121-b13, mixed mode)

> javac -version  
> javac 1.8.0\_121

> echo %JAVA\_HOME%  
> C:\Program Files (x86)\Java\jdk1.8.0\_121

Given I am using the 32-bit JVM client I have removed -server from jvm.options and set the thread stack size to 320k.

**From the elasticsearch service manager:**  
Java use default:

> True

Java virtual machine:

> c:\Program FIles (x86)\Java\jre.1.8.0\_121\bin\client\jvm.dll

Java classpath:

> c:\Workspace\ELK\elasticsearch-5.2.1/lib/elasticsearch-5.2.1.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/\*

Java options:

> -Xms2g  
> -Xmx2g  
> -XX:+UseConcMarkSweepGC  
> -XX:CMSInitiatingOccupancyFraction=75  
> -XX:+UseCMSInitiatingOccupancyOnly  
> -XX:+DisableExplicitGC  
> -XX:+AlwaysPreTouch  
> -Xss320k  
> -Djava.awt.headless=true  
> -Dfile.encoding=UTF-8  
> -Djna.nosys=true  
> -Djdk.io.permissionsUseCanonicalPath=true  
> -Dio.netty.noUnsafe=true  
> -Dio.netty.noKeySetOptimization=true  
> -Dio.netty.recycler.maxCapacityPerThread=0  
> -Dlog4j.shutdownHookEnabled=false  
> -Dlog4j2.disable.jmx=true  
> -Dlog4j.skipJansi=true  
> -XX:+HeapDumpOnOutOfMemoryError  
> -Delasticsearch  
> -Des.path.home=c:\Workspace\ELK\elasticsearch-5.2.1  
> -Des.default.path.logs=c:\Workspace\ELK\elasticsearch-5.2.1\logs  
> -Des.default.path.data=c:\Workspace\ELK\elasticsearch-5.2.1\data  
> -Des.default.path.conf=c:\Workspace\ELK\elasticsearch-5.2.1\config

Initial memory pool:

> 2048 MB

Maximum memory pool:

> 2048 MB

Thread stack size:

> 320 KB

What am I doing wrong/missing?

Cheers,

ATC

---

<div class="post-metadata">

**Author:** ![AtTheControls](https://avatars.discourse-cdn.com/v4/letter/a/8c91f0/32.png) [@AtTheControls](https://discuss.elastic.co/u/AtTheControls)\
**Post date:** [February 27, 2017, 11:36pm UTC](https://discuss.elastic.co/t/solved-unable-to-start-elasticsearch-could-not-reserve-enough-space-for-object-heap/76704/2 "2017-02-27T23:36:55Z")

</div>

**Log:**

> [2017-02-27 23:16:12] [debug] ( prunsrv.c:1679) [648] Commons Daemon procrun log initialized  
> [2017-02-27 23:16:12] [info] ( prunsrv.c:1683) [648] Commons Daemon procrun (1.0.15.0 32-bit) started  
> [2017-02-27 23:16:12] [info] ( prunsrv.c:725 ) [648] Starting service 'elasticsearch-service-x86' ...  
> [2017-02-27 23:16:12] [debug] ( prunsrv.c:1679) [11756] Commons Daemon procrun log initialized  
> [2017-02-27 23:16:12] [info] ( prunsrv.c:1683) [11756] Commons Daemon procrun (1.0.15.0 32-bit) started  
> [2017-02-27 23:16:12] [info] ( prunsrv.c:1596) [11756] Running 'elasticsearch-service-x86' Service...  
> [2017-02-27 23:16:12] [debug] ( prunsrv.c:1374) [88] Inside ServiceMain...  
> [2017-02-27 23:16:12] [debug] ( prunsrv.c:844 ) [88] reportServiceStatusE: 2, 0, 3000, 0  
> [2017-02-27 23:16:12] [info] ( prunsrv.c:1127) [88] Starting service...  
> [2017-02-27 23:16:12] [debug] ( javajni.c:233 ) [88] loading jvm 'C:\Program Files (x86)\Java\jre1.8.0\_121\bin\client\jvm.dll'  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[0] -Xms2g  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[1] -Xmx2g  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[2] -XX:+UseConcMarkSweepGC  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[3] -XX:CMSInitiatingOccupancyFraction=75  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[4] -XX:+UseCMSInitiatingOccupancyOnly  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[5] -XX:+DisableExplicitGC  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[6] -XX:+AlwaysPreTouch  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[7] -Xss320k  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[8] -Djava.awt.headless=true  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[9] -Dfile.encoding=UTF-8  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[10] -Djna.nosys=true  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[11] -Djdk.io.permissionsUseCanonicalPath=true  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[12] -Dio.netty.noUnsafe=true  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[13] -Dio.netty.noKeySetOptimization=true  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[14] -Dio.netty.recycler.maxCapacityPerThread=0  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[15] -Dlog4j.shutdownHookEnabled=false  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[16] -Dlog4j2.disable.jmx=true  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[17] -Dlog4j.skipJansi=true  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[18] -XX:+HeapDumpOnOutOfMemoryError  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[19] -Delasticsearch  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[20] -Des.path.home=c:\Workspace\ELK\elasticsearch-5.2.1  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[21] -Des.default.path.logs=c:\Workspace\ELK\elasticsearch-5.2.1\logs  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[22] -Des.default.path.data=c:\Workspace\ELK\elasticsearch-5.2.1\data  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[23] -Des.default.path.conf=c:\Workspace\ELK\elasticsearch-5.2.1\config  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[24] -Djava.class.path=c:\Workspace\ELK\elasticsearch-5.2.1/lib/elasticsearch-5.2.1.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/elasticsearch-5.2.1.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/HdrHistogram-2.1.6.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/hppc-0.7.1.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/jackson-core-2.8.6.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/jackson-dataformat-cbor-2.8.6.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/jackson-dataformat-smile-2.8.6.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/jackson-dataformat-yaml-2.8.6.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/jna-4.2.2.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/joda-time-2.9.5.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/jopt-simple-5.0.2.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/jts-1.13.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/log4j-1.2-api-2.7.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/log4j-api-2.7.jar;c:\Workspace\ELK\elasticsearch-5.2.1/lib/log4j-core-2.7.jar;c:\Workspace\ELK\elasticsearch-5.2.1  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[25] exit  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[26] -Xms2048m  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[27] -Xmx2048m  
> [2017-02-27 23:16:12] [debug] ( javajni.c:704 ) [9520] Jvm Option[28] -Xss320k  
> [2017-02-27 23:16:12] [debug] ( prunsrv.c:919 ) [9520] Start exit hook called ...  
> [2017-02-27 23:16:12] [debug] ( prunsrv.c:920 ) [9520] VM exit code: 0  
> [2017-02-27 23:16:12] [debug] ( prunsrv.c:844 ) [9520] reportServiceStatusE: 1, 0, 0, 0  
> [2017-02-27 23:16:13] [error] ( prunsrv.c:746 ) [648] Failed to start 'elasticsearch-service-x86' service  
> [2017-02-27 23:16:13] [error] ( prunsrv.c:746 ) [648] The specified program requires a newer version of Windows.  
> [2017-02-27 23:16:13] [info] ( prunsrv.c:754 ) [648] Start service finished.  
> [2017-02-27 23:16:14] [error] ( prunsrv.c:1755) [648] Commons Daemon procrun failed with exit value: 5 (Failed to start service)  
> [2017-02-27 23:16:14] [error] ( prunsrv.c:1755) [648] The specified program requires a newer version of Windows.

**stderr**

> 2017-02-27 23:16:12 Commons Daemon procrun stderr initialized  
> The specified program requires a newer version of Windows.

> Failed to start service

**stdout:**

> 2017-02-27 23:16:12 Commons Daemon procrun stdout initialized  
> Error occurred during initialization of VM  
> Could not reserve enough space for 2097152KB object heap

---

<div class="post-metadata">

**Author:** ![AtTheControls](https://avatars.discourse-cdn.com/v4/letter/a/8c91f0/32.png) [@AtTheControls](https://discuss.elastic.co/u/AtTheControls)\
**Post date:** [February 27, 2017, 11:51pm UTC](https://discuss.elastic.co/t/solved-unable-to-start-elasticsearch-could-not-reserve-enough-space-for-object-heap/76704/3 "2017-02-27T23:51:39Z")

</div>

Nevermind - looks like a limitation with Java 32-bit client running on a 64-bit machine. Have reduced heap size to 256M and it now starts

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 27, 2017, 11:52pm UTC](https://discuss.elastic.co/t/solved-unable-to-start-elasticsearch-could-not-reserve-enough-space-for-object-heap/76704/4 "2017-03-27T23:52:21Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.