[SOLR-6775] Creating backup snapshot null pointer exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.10
• Fix Version/s: 5.1, 6.0
• Component/s: replication (java)
• Labels: snapshot solr

Environment

Linux Server, Java version "1.7.0_21", Solr version 4.10.0

• Assignee: Shalin Shekhar Mangar
• Reporter: Ryan Hesson
• Created: 21/Nov/14 15:00
• Updated: 09/May/16 18:50
• Resolved: 05/Feb/15 10:39

Description

I set up Solr Replication. I have one master on a server, one slave on another server. The replication of data appears functioning correctly. The issue is when the master SOLR tries to create a snapshot backup it gets a null pointer exception.

org.apache.solr.handler.SnapShooter createSnapshot method calls org.apache.solr.handler.SnapPuller.delTree(snapShotDir); at line 162 and the exception happens within org.apache.solr.handler.SnapPuller at line 1026 because snapShotDir is null.
Here is the actual log output:

58319963 [qtp12610551-16] INFO org.apache.solr.core.SolrCore - newest commit generation = 349
58319983 [Thread-19] INFO org.apache.solr.handler.SnapShooter - Creating backup snapshot...
Exception in thread "Thread-19" java.lang.NullPointerException
at org.apache.solr.handler.SnapPuller.delTree(SnapPuller.java:1026)
at org.apache.solr.handler.SnapShooter.createSnapshot(SnapShooter.java:162)
at org.apache.solr.handler.SnapShooter$1.run(SnapShooter.java:91)

I may have missed how to set the directory in the documentation but I've looked around without much luck. I thought the process was to use the same directory as the index data for the snapshots. Is this a known issue with this release or am I missing how to set the value? If someone could tell me how to set snapshotdir or confirm that it is an issue and a different way of backing up the index is needed it would be much appreciated.