Heap size issue on migrating from Solr 5.0.0 to Solr 5.1.0

Question

I have a Solr 5.0.0 in production with a custom heap size like this

SOLR_JAVA_MEM="-Xms2g -Xmx2g"

When I tried to migrate to Solr 5.1.0 with the same configuration and start the server it returned a OutOfMemoryError. Looking to the Solr API I saw that the heap size was set to 512m. My custom heap configuration is not working in Solr 5.1.0 and the server is starting with the default heap size value.

Answer 1

It's a bug that occurs just in Solr 5.1. There is an issue resolved that fixed this bug in Solr 5.2.

https://issues.apache.org/jira/browse/SOLR-7454

The problem is that Solr 5.1 doesn't use SOLR_JAVA_MEM to set heap size. It uses SOLR_HEAP to set the min and max heap sizes with the same value like this:

SOLR_HEAP="2g"

This way solr will start with -Xms=2g and -Xmx=2g

In Solr 5.2 this bug was fixed and the two SOLR_JAVA_MEM and SOLR_HEAP work fine.

Answer 2

In my case, with the same SOLR version (v.5.0), I changed it in bin\solr.in.sh file.

There are other files that has "-Xms512m -Xmx512m", just be aware that those won't update the JVM Memory such as:

1. bin\solr
2. bin\solr.in.cmd
3. bin\solr.cmd