Hi Lasse,
I know that your have functionality in place for managing memory using
Neo4j configs ( I use it ).
The "ERROR! Neo4j cannot be started using java version . " error occurs
because of the following command:
java -version
which does not use the config settings used in the Neo4J config settings.
On the server over commit memory was set to 2 (do not allow overcommiting
of memory):
sudo sysctl vm.overcommit_memory=2
Swap was disabled.
And disk cache was huge (200 GiB).
So when "java -version" tried to run, is was not allowed because it tried
to claim to much memory by default
(when vm.overcommit_memory=2 is active, if you malloc memory, even if you
don't use it, it should be less than the total amount of free RAM + swap).
I will look at the pull request stuff later.
Thanks,
Gert
The patch above just solves the
Op donderdag 30 oktober 2014 09:28:39 UTC+1 schreef Lasse Westh-Nielsen:
>
> Gert,
>
> We have functionality in place for you to manage memory using Neo4j
> configs. Look for neo4j-wrapper.conf in $NEO4J_HOME/conf. The configuration
> in there is used here:
> https://github.com/neo4j/neo4j/blob/master/packaging/standalone/src/main/distribution/shell-scripts/bin/neo4j#L73
>
> As for using different versions of grep, I remember writing that
> particular bit of code a couple of years ago! Alas, my Linux skills are not
> up to scratch, well spotted.
>
> As for changing it, any chance you might want to submit a pull request
> with the change for us? There is some stuff here about how to go about it:
> http://neo4j.com/docs/stable/community-contributing.html. We always
> welcome help like that, and your name would live forever afterwards:
> http://neo4j.com/docs/stable/contributors.html ;)
>
> Thanks,
>
> Lasse
>
>
>
>
> On Tue, Oct 28, 2014 at 11:44 AM, Gert Hulselmans <[email protected]
> <javascript:>> wrote:
>
>> Hi,
>>
>> I have problems with starting Neo4J on a server with 256GiB of RAM.
>>
>> $ ./neo4j-community-2.1.5/bin/neo4j start
>> ERROR! Neo4j cannot be started using java version .
>> * Please use Oracle(R) Java(TM) 7 or OpenJDK(TM) to run Neo4j Server.
>> * Please see http://docs.neo4j.org/ for Neo4j Server installation
>> instructions.
>>
>>
>>
>> The problem comes from the checkjvmcompatibility function in ./bin/utils,
>> as it tries to run JVM without giving initial and maximum heap size.
>> Due the large amount of RAM in the server, JVM tries to allocate to many
>> GiB
>> which are not always free.
>>
>> # check if running Oracle JDK 7 or OpenJDK 7, warn if not
>> checkjvmcompatibility() {
>> # Shut down if java version < 1.7
>> JAVAVERSION=$("$JAVACMD" ${JAVA_OPTS} -version 2>&1 | awk -F '"'
>> '/version/ {print $2}')
>> if [[ "$JAVAVERSION" < "1.7" ]]; then
>> complain_about_java_version
>> #exit 1
>> fi
>>
>> $JAVACMD ${JAVA_OPTS} -version 2>&1 | egrep -q "(Java
>> HotSpot\\(TM\\)|OpenJDK) (64-Bit Server|Server|Client) VM"
>> if [ $? -eq 1 ]
>> then
>> warn_about_java_runtime
>> fi
>> }
>>
>>
>>
>> After fixing the function to the following, I can start Neo4J correctly.
>>
>>
>> # check if running Oracle JDK 7 or OpenJDK 7, warn if not
>> checkjvmcompatibility() {
>> # Get Java version output
>> JAVAVERSIONOUTPUT=$("$JAVACMD" -Xms10M -Xmx10M -version 2>&1)
>>
>> # Check if JVM was able to start correctly.
>> if [ $? -ne 0 ] ; then
>> echo 'ERROR: Problem with starting JVM.'
>> exit 1
>> fi
>>
>> # Shut down if java version < 1.7
>> JAVAVERSION=$(echo "$JAVAVERSIONOUTPUT" | awk -F '"' '/version/ {print
>> $2}')
>> if [[ "$JAVAVERSION" < "1.7" ]]; then
>> complain_about_java_version
>> exit 1
>> fi
>>
>> echo "$JAVAVERSIONOUTPUT" | egrep -q "(Java HotSpot\\(TM\\)|OpenJDK)
>> (64-Bit Server|Server|Client) VM"
>> if [ $? -eq 1 ]
>> then
>> warn_about_java_runtime
>> fi
>> }
>>
>>
>> According to the manual of grep: egrep is deprecated, so it might be
>> better to use grep -E instead:
>>
>> In addition, three variant programs egrep, fgrep and rgrep are
>> available.
>> egrep is the same as grep -E.
>> fgrep is the same as grep -F.
>> rgrep is the same as grep -r.
>> Direct invocation as either egrep or fgrep is deprecated, but is
>> provided to allow historical applications that rely on them to run
>> unmodified.
>>
>>
>> Kind regards,
>> Gert Hulselmans
>>
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