[OAK-2880] NPE in SegmentWriter.writeMap

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.19, 1.2.4, 1.3.0, 1.4
• Component/s: segmentmk
• Labels: resilience
• Assignee: Michael Dürig
• Reporter: Michael Dürig
• Created: 18/May/15 09:51
• Updated: 02/Mar/16 11:36
• Resolved: 27/May/15 11:16

Description

Under some rare conditions which are not entirely clear yet SegmentWriter.writeMap results in a NPE:

java.lang.NullPointerException
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:192)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeRecordId(SegmentWriter.java:366)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeMapLeaf(SegmentWriter.java:417)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeMapBucket(SegmentWriter.java:475)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeMapBucket(SegmentWriter.java:511)
	at org.apache.jackrabbit.oak.plugins.segment.SegmentWriter.writeMap(SegmentWriter.java:711)

This happens when the base passed to writeMap(MapRecord base, Map<String, RecordId> changes) is not null but doesn't contain some of the keys removed through the updates provided in the passed changes.

Issue Links

• relates to: OAK-2862 CompactionMap#compress() inefficient for large compaction maps