• Check the size of the split point before performing a manual split chunk operation SERVER-14431 649 

• Ensure read preferences are re-evaluated by drawing secondary connections from a global pool and releasing back to the pool at the end of a query/command SERVER-9788 650 

• Allow read from secondaries when both audit and authorization are enabled in a sharded cluster SERVER- 14170 651 

• All issues closed in 2.6.4 652 

## 2.6.3 – June 19, 2014 

• Equality queries on _id with projection may return no results on sharded collections SERVER-14302$^{653}$. 

• Equality queries on _id with projection on _id may return orphan documents on sharded collections SERVER- 14304$^{654}$. 

• All issues closed in 2.6.3$^{655}$. 

## 2.6.2 – June 16, 2014 

• Query plans with differing performance can tie during plan ranking SERVER-13675$^{656}$. 

• mongod may terminate if x.509 authentication certificate is invalid SERVER-13753$^{657}$. 

• Temporary map/reduce collections are incorrectly replicated to secondaries SERVER-13981$^{658}$. 

• mongos incorrectly targets multiple shards for nested field shard key predicates SERVER-14138$^{659}$. 

• rs.stepDown() during mapReduce causes fassert when writing to op log SERVER-14186$^{660}$. 

• All issues closed in 2.6.2$^{661}$. 

## 2.6.1 – May 5, 2014 

• Fix to install MongoDB service on Windows with the --install option SERVER-13515$^{662}$. 

• Allow direct upgrade from 2.4.x to 2.6.0 via yum SERVER-13563$^{663}$. 

• Fix issues with background index builds on secondaries: SERVER-13589 664 and SERVER-13620$^{665}$. 

• Redact credential information passed as startup options SERVER-13644$^{666}$. 

