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Frequently Asked Questions (FAQs)

I get a warning “Traversed 1000 nodes …”, what does that mean?

You might be missing an index. See Query engine.

I get a warning “Attempt to perform … while another thread is concurrently …”, what is wrong?

You are accessing a Session instance concurrently from multiple threads. Session instances are not thread safe. Enabling DEBUG logging for SessionDelegate provides stack traces for both sessions involved. Note: this should be used for debugging only as it has a major impact on system performance.

My repository size on disk is growing beyond control (SegmentNodeStore)

You need to setup a regular job for compacting the segments.

How do I debug merge conflict errors

Debugging merge conflict errors is now possible by enabling DEBUG logs on org.apache.jackrabbit.oak.plugins.commit.MergingNodeStateDiff and org.apache.jackrabbit.oak.plugins.commit.ConflictValidator. This option is available via OAK-3057 since Oak 1.0.17, 1.2.3, 1.3.3.

My question is not listed here

Search the Oak dev list and the Oak issue tracker. If you still can't find an answer ask on the list.