Minor - P4 ISSUE SUMMARY
The limit for the recursive tree depth of query documents currently is only 10 levels deep. While most queries should not be affected by this issue, certain auto-generated queries, for example from ORM mappers, can construct complex nested query documents and hit the limit.
USER IMPACT
In 2.4 the limit was not strictly enforced, so users may find some of their queries to be rejected after upgrading to 2.6.
WORKAROUNDS
Manual queries with a high tree depth often can be reduced to a flatter version, for example by removing nested $and predicates and instead adding the conditions to a single $and statement.
RESOLUTION
This patch increases the tree depth from 10 to 100 and brings it in line with the value documented on the MongoDB Limits and Thresholds page.
AFFECTED VERSIONS
MongoDB 2.6.0 is affected by this bug.
PATCHES
The patch is included in the 2.6.1 production release.
Original description
Right now the number of recursive calls is limited to 20 in parsing (which corresponds to a maximum allowed tree depth of 10):
Some autogenerated queries may hit this limit, so let's make it higher.
- related to
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SERVER-15559 Fatal Exception: Deeply nested $cond drops mongod process
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- Closed
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