[SOLR-9360] Solr script not properly checking SOLR_PID

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 6.1
• Fix Version/s: 6.4, 7.0
• Component/s: scripts and tools
• Assignee: Erick Erickson
• Reporter: Alessandro Benedetti
• Created: 29/Jul/16 15:30
• Updated: 08/Jun/19 15:37
• Resolved: 04/Nov/16 20:03

Description

In the solr script we see in 3-4 areas this check :

SOLR_PID=`ps auxww | grep start\.jar | grep -w $SOLR_PORT | grep -v grep | awk '

{print $2}

' | sort -r`

This can potentially prevent a solr instance to start in the case another process by any chance contains the port int the command itself ( not necessarily actually using the port) .

e.g.
java -server -Djetty.port=10504 -DSTOP.PORT=9504 -DSTOP.KEY=solrrocks -DMASTER_CORE_URL=external-server:10500/solr -jar start.jar --module=http

A solr is running on 10504.
A new Solr will not be able to start on 10500 ( but actually the port is free).
This should be replaced by a real check if the port is used ( like netstat or similar) .