2.6 Changelog¶

On this page

2.6.12 Changelog
2.6.11 – Changes
2.6.10 – Changes
2.6.9 – Changes
2.6.8 – Changes
2.6.7 – Changes
2.6.6 – Changes
2.6.5 – Changes
2.6.4 – Changes
2.6.3 – Changes
2.6.2 – Changes
2.6.1 – Changes

2.6.12 Changelog¶

Security¶

SERVER-19284 Should not be able to create role with same name as builtin role

Sharding¶

SERVER-17886 dbKillCursors op asserts on mongos when at log level 3
SERVER-19266 An error document is returned with result set
SERVER-20191 multi-updates/remove can make successive queries skip shard version checking
SERVER-20839 trace_missing_docs_test.js compares Timestamp instances using < operator in mongo shell

Query¶

SERVER-2454 Queries that are killed during a yield should return error to user instead of partial result set
SERVER-16042 Optimise $all/$and to select smallest subset as initial index bounds
SERVER-19725 NULL pointer crash in QueryPlanner::plan with $near operator
SERVER-20083 Add log statement at default log level for when an index filter is set or cleared successfully
SERVER-20829 RUNNER_DEAD on document delete during update by _id or find by _id
SERVER-21227 MultiPlanStage::invalidate() should not flag and drop invalidated WorkingSetMembers
SERVER-21602 Reduce execution time of cursor_timeout.js
SERVER-22195 queryoptimizer3.js failing on 2.6
SERVER-22535 Some index operations (drop index, abort index build, update TTL config) on collection during active migration can cause migration to skip documents

Write Operations¶

SERVER-21647 $rename changes field ordering

Storage¶

SERVER-21543 Lengthen delay before deleting old journal files

MMAP¶

SERVER-22261 MMAPv1 LSNFile may be updated ahead of what is synced to data files

Operations¶

SERVER-13985 printShardingStatus uses group/JS

Build and Packaging¶

SERVER-18432 alert when passing unused variables to scons
SERVER-18793 Enterprise RPM build issues
SERVER-19509 The nproc ulimits are different across packages
SERVER-20583 migrate all windows-64 vs2010 builders in evergreen to use new version of the distribution
SERVER-20830 set push and docs_tickets tasks as not available for patch testing
SERVER-21864 streamline artifact signing procedure to support coherent release process

Internals¶

SERVER-20121 XorShift PRNG should use unsigned arithmetic
SERVER-20401 Publicly expose net.ssl.disabledProtocols

2.6.11 – Changes¶

Querying¶

SERVER-19553 mongod shouldn’t use sayPiggyBack to send killCursor messages
SERVER-18620 Reduce frequency of “staticYield can't unlock” log message
SERVER-18461 Range predicates comparing against a BinData value should be covered, but are not in 2.6
SERVER-17815 Plan ranking tie breaker is computed incorrectly
SERVER-16265 Add query details to getmore entry in profiler and db.currentOp()
SERVER-15217 v2.6 query plan ranking test “NonCoveredIxisectFetchesLess” relies on order of deleted record list
SERVER-14070 Compound index not providing sort if equality predicate given on sort field

Replication¶

SERVER-18280 ReplicaSetMonitor should use electionId to avoid talking to old primaries
SERVER-18795 db.printSlaveReplicationInfo()/rs.printSlaveReplicationInfo() can not work with ARBITER role

Sharding¶

SERVER-19464 $sort stage in aggregation doesn’t call scoped connections done ()
SERVER-18955 mongos doesn’t set batch size (and keeps the old one, 0) on getMore if performed on first _cursor->more()

Indexing¶

SERVER-19559 Document growth of “key too large” document makes it disappear from the index
SERVER-16348 Assertion failure n >= 0 && n < static_cast<int>(_files.size()) src/mongo/db/storage/extent_manager.cpp 109
SERVER-13875 ensureIndex() of 2dsphere index breaks after upgrading to 2.6 (with the new createIndex command)

Networking¶

SERVER-19389 Remove wire level endianness check

Build and Testing¶

SERVER-18097 Remove mongosTest_auth and mongosTest_WT tasks from evergreen.yml
SERVER-18068 Coverity analysis defect 72413: Resource leak
SERVER-18371 Add SSL library config detection

2.6.10 – Changes¶

Security¶

SERVER-18312 Upgrade PCRE to latest
SERVER-17812 LockPinger has audit-related GLE failure
SERVER-17647 Compute BinData length in v8
SERVER-17591 Add SSL flag to select supported protocols
SERVER-16849 On mongos we always invalidate the user cache once, even if no user definitions are changing
SERVER-11980 Improve user cache invalidation enforcement on mongos

Querying¶

SERVER-18364 Ensure non-negation predicates get chosen over negation predicates for multikey index bounds construction
SERVER-17815 Plan ranking tie breaker is computed incorrectly
SERVER-16256 $all clause with elemMatch uses wider bounds than needed

Replication¶

SERVER-18211 MongoDB fails to correctly roll back collection creation
SERVER-17771 Reconfiguring a replica set to remove a node causes a segmentation fault on 2.6.8
SERVER-13542 Expose electionId on primary in isMaster

Sharding¶

SERVER-17812 LockPinger has audit-related GLE failure
SERVER-17805 logOp / OperationObserver should always check shardversion
SERVER-17749 collMod usePowerOf2Sizes fails on mongos
SERVER-11980 Improve user cache invalidation enforcement on mongos

Storage¶

SERVER-18211 MongoDB fails to correctly roll back collection creation
SERVER-17653 ERROR: socket XXX is higher than 1023; not supported on 2.6.*

Indexing¶

SERVER-17018 Assertion failure false src/mongo/db/structure/btree/key.cpp Line 433 on remove operation

Write Ops¶

SERVER-18111 mongod allows user inserts into system.profile collection
SERVER-13542 Expose electionId on primary in isMaster

Networking¶

SERVER-18096 Shard primary incorrectly reuses closed sockets after relinquish and re-election
SERVER-17591 Add SSL flag to select supported protocols

Build and Packaging¶

SERVER-18344 logs should be sent to updated logkeeper server
SERVER-18082 Change smoke.py buildlogger command line options to environment variables
SERVER-18312 Upgrade PCRE to latest
SERVER-17780 Init script sets process ulimit to different value compared to documentation
SERVER-16563 Debian repo component mismatch - mongodb/10gen

Shell¶

SERVER-17951 db.currentOp() fails with read preference set

Testing¶

SERVER-18262 setup_multiversion_mongodb should retry links download on timeouts
SERVER-18229 smoke.py with PyMongo 3.0.1 fails to run certain tests
SERVER-18073 Fix smoke.py to work with PyMongo 3.0

2.6.9 – Changes¶

Security¶

SERVER-16073 Create hidden net.ssl.sslCipherConfig flag

Querying¶

SERVER-14723 Crash during query planning for geoNear command with multiple 2dsphere indexes
SERVER-14071 For queries with sort(), bad non-blocking plan can be cached if there are zero results
SERVER-8188 Configurable idle cursor timeout

Replication and Sharding¶

SERVER-17429 the message logged when changing sync target due to stale data should format OpTimes in a consistent way
SERVER-17441 mongos crash right after “not master” error

Storage¶

SERVER-15907 Use ftruncate rather than fallocate when running on tmpfs

Aggregation Framework¶

SERVER-17426 Aggregation framework query by _id returns duplicates in sharded cluster (orphan documents)
SERVER-17224 Aggregation pipeline with 64MB document can terminate server

Build and Platform¶

SERVER-17484 Migrate server MCI config into server repo
SERVER-17252 Upgrade PCRE Version from 8.30 to Latest

Diagnostics and Internal Code¶

SERVER-17226 top command with 64MB result document can terminate server
SERVER-17338 NULL pointer crash when running copydb against stepped-down 2.6 primary
SERVER-14992 Query for Windows 7 File Allocation Fix, and other hotfixes

2.6.8 – Changes¶

Security and Networking¶

SERVER-17278 BSON BinData validation enforcement
SERVER-17022 No SSL Session Caching may not be respected
SERVER-17264 improve bson validation

Query and Aggregation¶

SERVER-16655 Geo predicate is unable to use compound 2dsphere index if it is root of $or clause
SERVER-16527 2dsphere explain reports “works” for nscanned & nscannedObjects
SERVER-15802 Query optimizer should always use equality predicate over unique index when possible
SERVER-14044 Incorrect {$meta: 'text'} reference in aggregation $sort error message

Replication¶

SERVER-16599 copydb and clone commands can crash the server if a primary steps down
SERVER-16315 Replica set nodes should not threaten to veto nodes whose config version is higher than their own
SERVER-16274 secondary fasserts trying to replicate an index
SERVER-15471 Better error message when replica is not found in GhostSync::associateSlave

Sharding¶

SERVER-17191 Spurious warning during upgrade of sharded cluster
SERVER-17163 Fatal error “logOp but not primary” in MigrateStatus::go
SERVER-16984 UpdateLifecycleImpl can return empty collectionMetadata even if ns is sharded
SERVER-10904 Possible for _master and _slaveConn to be pointing to different connections even with primary read pref

Storage¶

SERVER-17087 Add listCollections command functionality to 2.6 shell & client
SERVER-14572 Increase C runtime stdio file limit

Tools¶

SERVER-17216 2.6 mongostat cannot be used with 3.0 mongod
SERVER-14190 mongorestore parseMetadataFile passes non-null terminated string to ‘fromjson’

Build and Packaging¶

SERVER-14803 Support static libstdc++ builds for non-Linux builds
SERVER-15400 Create Windows Enterprise Zip File with vcredist and dependent dlls

Usability¶

SERVER-14756 The YAML storage.quota.enforced option is not found

Testing¶

SERVER-16421 sharding_rs2.js should clean up data on all replicas

2.6.7 – Changes¶

Stability¶

SERVER-16237 Don’t check the shard version if the primary server is down

Querying¶

SERVER-16408 max_time_ms.js should not run in parallel suite.

Replication¶

SERVER-16732 SyncSourceFeedback::replHandshake() may perform an illegal erase from a std::map in some circumstances

Sharding¶

SERVER-16683 Decrease mongos memory footprint when shards have several tags
SERVER-15766 prefix_shard_key.js depends on primary allocation to particular shards
SERVER-14306 mongos can cause shards to hit the in-memory sort limit by requesting more results than needed.

Packaging¶

SERVER-16081 /etc/init.d/mongod startup script fails, with dirname message

2.6.6 – Changes¶

Security¶

SERVER-15673 Disable SSLv3 ciphers
SERVER-15515 New test for mixed version replSet, 2.4 primary, user updates
SERVER-15500 New test for system.user operations

Stability¶

SERVER-12061 Do not silently ignore read errors when syncing a replica set node
SERVER-12058 Primary should abort if encountered problems writing to the oplog

Querying¶

SERVER-16291 Cannot set/list/clear index filters on the secondary
SERVER-15958 The “isMultiKey” value is not correct in the output of aggregation explain plan
SERVER-15899 Querying against path in document containing long array of subdocuments with nested arrays causes stack overflow
SERVER-15696 $regex, $in and $sort with index returns too many results
SERVER-15639 Text queries can return incorrect results and leak memory when multiple predicates given on same text index prefix field
SERVER-15580 Evaluating candidate query plans with concurrent writes on same collection may crash mongod
SERVER-15528 Distinct queries can scan many index keys without yielding read lock
SERVER-15485 CanonicalQuery::canonicalize can leak a LiteParsedQuery
SERVER-15403 $min and $max equal errors in 2.6 but not in 2.4
SERVER-15233 Cannot run planCacheListQueryShapes on a Secondary
SERVER-14799 count with hint doesn’t work when hint is a document

Replication¶

SERVER-16107 2.6 mongod crashes with segfault when added to a 2.8 replica set with >= 12 nodes.
SERVER-15994 listIndexes and listCollections can be run on secondaries without slaveOk bit
SERVER-15849 do not forward replication progress for nodes that are no longer part of a replica set
SERVER-15491 SyncSourceFeedback can crash due to a SocketException in authenticateInternalUser

Sharding¶

SERVER-15318 copydb should not use exhaust flag when used against mongos
SERVER-14728 Shard depends on string comparison of replica set connection string
SERVER-14506 special top chunk logic can move max chunk to a shard with incompatible tag
SERVER-14299 For sharded limit=N queries with sort, mongos can request >N results from shard
SERVER-14080 Have migration result reported in the changelog correctly
SERVER-12472 Fail MoveChunk if an index is needed on TO shard and data exists

Storage¶

SERVER-16283 Can’t start new wiredtiger node with log file or config file in data directory - false detection of old mmapv1 files
SERVER-15986 Starting with different storage engines in the same dbpath should error/warn
SERVER-14057 Changing TTL expiration time with collMod does not correctly update index definition

Indexing and write Operations¶

SERVER-14287 ensureIndex can abort reIndex and lose indexes
SERVER-14886 Updates against paths composed with array index notation and positional operator fail with error

Data Aggregation¶

SERVER-15552 Errors writing to temporary collections during mapReduce command execution should be operation-fatal

Build and Packaging¶

SERVER-14184 Unused preprocessor macros from s2 conflict on OS X Yosemite
SERVER-14015 S2 Compilation on GCC 4.9/Solaris fails
SERVER-16017 Suse11 enterprise packages fail due to unmet dependencies
SERVER-15598 Ubuntu 14.04 Enterprise packages depend on unavailable libsnmp15 package
SERVER-13595 Red Hat init.d script error: YAML config file parsing

Logging and Diagnostics¶

SERVER-13471 Increase log level of “did reduceInMemory” message in map/reduce
SERVER-16324 Command execution log line displays “query not recording (too large)” instead of abbreviated command object
SERVER-10069 Improve errorcodes.py so it captures multiline messages

Testing and Internals¶

SERVER-15632 MultiHostQueryOp::PendingQueryContext::doBlockingQuery can leak a cursor object
SERVER-15629 GeoParser::parseMulti{Line|Polygon} does not clear objects owned by out parameter
SERVER-16316 Remove unsupported behavior in shard3.js
SERVER-14763 Update jstests/sharding/split_large_key.js
SERVER-14249 Add tests for querying oplog via mongodump using –dbpath
SERVER-13726 indexbg_drop.js

2.6.5 – Changes¶

Security¶

SERVER-15465 OpenSSL crashes on stepdown
SERVER-15360 User document changes made on a 2.4 primary and replicated to a 2.6 secondary don’t make the 2.6 secondary invalidate its user cache
SERVER-14887 Allow user document changes made on a 2.4 primary to replicate to a 2.6 secondary
SERVER-14727 Details of SASL failures aren’t logged
SERVER-12551 Audit DML/CRUD operations

Stability¶

SERVER-9032 mongod fails when launched with misconfigured locale

Querying¶

SERVER-15287 Query planner sort analysis incorrectly allows index key pattern plugin fields to provide sort
SERVER-15286 Assertion in date indexes when opposite-direction-sorted and double “or” filtered
SERVER-15279 Disable hash-based index intersection (AND_HASH) by default
SERVER-15152 When evaluating plans, some index candidates cause complete index scan
SERVER-15015 Assertion failure when combining $max and $min and reverse index scan
SERVER-15012 Server crashes on indexed rooted $or queries using a 2d index
SERVER-14969 Dropping index during active aggregation operation can crash server
SERVER-14961 Plan ranker favors intersection plans if predicate generates empty range index scan
SERVER-14892 Invalid {$elemMatch: {$where}} query causes memory leak
SERVER-14706 Queries that use negated $type predicate over a field may return incomplete results when an index is present on that field
SERVER-13104 Plan enumerator doesn’t enumerate all possibilities for a nested $or
SERVER-14984 Server aborts when running $centerSphere query with NaN radius
SERVER-14981 Server aborts when querying against 2dsphere index with coarsestIndexedLevel:0
SERVER-14831 Text search trips assertion when default language only supported in textIndexVersion=1 used

Replication¶

SERVER-15038 Multiple background index builds may not interrupt cleanly for commands, on secondaries
SERVER-14887 Allow user document changes made on a 2.4 primary to replicate to a 2.6 secondary
SERVER-14805 Use multithreaded oplog replay during initial sync

Sharding¶

SERVER-15056 Sharded connection cleanup on setup error can crash mongos
SERVER-13702 Commands without optional query may target to wrong shards on mongos
SERVER-15156 MongoDB upgrade 2.4 to 2.6 check returns error in config.changelog collection

Storage¶

SERVER-15369 explicitly zero .ns files on creation
SERVER-15319 Verify 2.8 freelist is upgrade-downgrade safe with 2.6
SERVER-15111 partially written journal last section causes recovery to fail

Indexing¶

SERVER-14848 Port index_id_desc.js to v2.6 and master branches
SERVER-14205 ensureIndex failure reports ok: 1 on some failures

Write Operations¶

SERVER-15106 Incorrect nscanned and nscannedObjects for idhack updates in 2.6.4 profiler or slow query log
SERVER-15029 The $rename modifier uses incorrect dotted source path
SERVER-14829 UpdateIndexData::clear() should reset all member variables

Data Aggregation¶

SERVER-15087 Server crashes when running concurrent mapReduce and dropDatabase commands
SERVER-14969 Dropping index during active aggregation operation can crash server
SERVER-14168 Warning logged when incremental MR collections are unsuccessfully dropped on secondaries

Packaging¶

SERVER-14679 (CentOS 7/RHEL 7) init.d script should create directory for pid file if it is missing
SERVER-14023 Support for RHEL 7 Enterprise .rpm packages
SERVER-13243 Support for Ubuntu 14 “Trusty” Enterprise .deb packages
SERVER-11077 Support for Debian 7 Enterprise .deb packages
SERVER-10642 Generate Community and Enterprise packages for SUSE 11

Logging and Diagnostics¶

SERVER-14964 nscanned not written to the logs at logLevel 1 unless slowms exceeded or profiling enabled
SERVER-12551 Audit DML/CRUD operations
SERVER-14904 Adjust dates in tool/exportimport_date.js to account for different timezones

Internal Code and Testing¶

SERVER-13770 Helpers::removeRange should check all runner states
SERVER-14284 jstests should not leave profiler enabled at test run end
SERVER-14076 remove test replset_remove_node.js
SERVER-14778 Hide function and data pointers for natively-injected v8 functions

2.6.4 – Changes¶

Security¶

SERVER-14701 The “backup” auth role should allow running the “collstats” command for all resources
SERVER-14518 Allow disabling hostname validation for SSL
SERVER-14268 Potential information leak
SERVER-14170 Cannot read from secondary if both audit and auth are enabled in a sharded cluster
SERVER-13833 userAdminAnyDatabase role should be able to create indexes on admin.system.users and admin.system.roles
SERVER-12512 Add role-based, selective audit logging.
SERVER-9482 Add build flag for sslFIPSMode

Querying¶

SERVER-14625 Query planner can construct incorrect bounds for negations inside $elemMatch
SERVER-14607 hash intersection of fetched and non-fetched data can discard data from a result
SERVER-14532 Improve logging in the case of plan ranker ties
SERVER-14350 Server crash when $centerSphere has non-positive radius
SERVER-14317 Dead code in IDHackRunner::applyProjection
SERVER-14311 skipping of index keys is not accounted for in plan ranking by the index scan stage
SERVER-14123 some operations can create BSON object larger than the 16MB limit
SERVER-14034 Sorted $in query with large number of elements can’t use merge sort
SERVER-13994 do not aggressively pre-fetch data for parallelCollectionScan

Replication¶

SERVER-14665 Build failure for v2.6 in closeall.js caused by access violation reading _me
SERVER-14505 cannot dropAllIndexes when index builds in progress assertion failure
SERVER-14494 Dropping collection during active background index build on secondary triggers segfault
SERVER-13822 Running resync before replset config is loaded can crash mongod
SERVER-11776 Replication ‘isself’ check should allow mapped ports

Sharding¶

SERVER-14551 Runner yield during migration cleanup (removeRange) results in fassert
SERVER-14431 Invalid chunk data after splitting on a key that’s too large
SERVER-14261 stepdown during migration range delete can abort mongod
SERVER-14032 v2.6 mongos doesn’t verify _id is present for config server upserts
SERVER-13648 better stats from migration cleanup
SERVER-12750 mongos shouldn’t accept initial query with “exhaust” flag set
SERVER-9788 mongos does not re-evaluate read preference once a valid replica set member is chosen
SERVER-9526 Log messages regarding chunks not very informative when the shard key is of type BinData

Storage¶

SERVER-14198 Std::set<pointer> and Windows Heap Allocation Reuse produces non-deterministic results
SERVER-13975 Creating index on collection named “system” can cause server to abort
SERVER-13729 Reads & Writes are blocked during data file allocation on Windows
SERVER-13681 mongod B stalls during background flush on Windows

Indexing¶

SERVER-14494 Dropping collection during active background index build on secondary triggers segfault

Write Ops¶

SERVER-14257 “remove” command can cause process termination by throwing unhandled exception if profiling is enabled
SERVER-14024 Update fails when query contains part of a DBRef and results in an insert (upsert:true)
SERVER-13764 debug mechanisms report incorrect nscanned / nscannedObjects for updates

Networking¶

SERVER-13734 Remove catch (…) from handleIncomingMsg

Geo¶

SERVER-14039 $nearSphere query with 2d index, skip, and limit returns incomplete results
SERVER-13701 Query using 2d index throws exception when using explain()

Text Search¶

SERVER-14738 Updates to documents with text-indexed fields may lead to incorrect entries
SERVER-14027 Renaming collection within same database fails if wildcard text index present

Tools¶

SERVER-14212 mongorestore may drop system users and roles
SERVER-14048 mongodump against mongos can’t send dump to standard output

Admin¶

SERVER-14556 Default dbpath for mongod --configsvr changes in 2.6
SERVER-14355 Allow dbAdmin role to manually create system.profile collections

Packaging¶

SERVER-14283 Parameters in installed config file are out of date

JavaScript¶

SERVER-14254 Do not store native function pointer as a property in function prototype
SERVER-13798 v8 garbage collection can cause crash due to independent lifetime of DBClient and Cursor objects
SERVER-13707 mongo shell may crash when converting invalid regular expression

Shell¶

SERVER-14341 negative opcounter values in serverStatus
SERVER-14107 Querying for a document containing a value of either type Javascript or JavascriptWithScope crashes the shell

Usability¶

SERVER-13833 userAdminAnyDatabase role should be able to create indexes on admin.system.users and admin.system.roles

Logging and Diagnostics¶

SERVER-12512 Add role-based, selective audit logging.
SERVER-14341 negative opcounter values in serverStatus

Testing¶

SERVER-14731 plan_cache_ties.js sometimes fails
SERVER-14147 make index_multi.js retry on connection failure
SERVER-13615 sharding_rs2.js intermittent failure due to reliance on opcounters

2.6.3 – Changes¶

SERVER-14302 Fixed: “Equality queries on _id with projection may return no results on sharded collections”
SERVER-14304 Fixed: “Equality queries on _id with projection on _id may return orphan documents on sharded collections”

2.6.2 – Changes¶

Security¶

SERVER-13727 The backup authorization role now includes privileges to run the collStats command.
SERVER-13804 The built-in role restore now has privileges on system.roles collection.
SERVER-13612 Fixed: “SSL-enabled server appears not to be sending the list of supported certificate issuers to the client”
SERVER-13753 Fixed: “mongod may terminate if x.509 authentication certificate is invalid”
SERVER-13945 For replica set/sharded cluster member authentication, now matches x.509 cluster certificates by attributes instead of by substring comparison.
SERVER-13868 Now marks V1 users as probed on databases that do not have surrogate user documents.
SERVER-13850 Now ensures that the user cache entry is up to date before using it to determine a user’s roles in user management commands on mongos.
SERVER-13588 Fixed: “Shell prints startup warning when auth enabled”

Querying¶

SERVER-13731 Fixed: “Stack overflow when parsing deeply nested $not query”
SERVER-13890 Fixed: “Index bounds builder constructs invalid bounds for multiple negations joined by an $or”
SERVER-13752 Verified assertion on empty $in clause and sort on second field in a compound index.
SERVER-13337 Re-enabled idhack for queries with projection.
SERVER-13715 Fixed: “Aggregation pipeline execution can fail with $or and blocking sorts”
SERVER-13714 Fixed: “non-top-level indexable $not triggers query planning bug”
SERVER-13769 Fixed: “distinct command on indexed field with geo predicate fails to execute”
SERVER-13675 Fixed “Plans with differing performance can tie during plan ranking”
SERVER-13899 Fixed: “‘Whole index scan’ query solutions can use incompatible indexes, return incorrect results”
SERVER-13852 Fixed “IndexBounds::endKeyInclusive not initialized by constructor”
SERVER-14073 planSummary no longer truncated at 255 characters
SERVER-14174 Fixed: “If ntoreturn is a limit (rather than batch size) extra data gets buffered during plan ranking”
SERVER-13789 Some nested queries no longer trigger an assertion error
SERVER-14064 Added planSummary information for count command log message.
SERVER-13960 Queries containing $or no longer miss results if multiple clauses use the same index.
SERVER-14180 Fixed: “Crash with ‘and’ clause, $elemMatch, and nested $mod or regex”
SERVER-14176 Natural order sort specification no longer ignored if query is specified.
SERVER-13754 Bounds no longer combined for $or queries that can use merge sort.

Geospatial¶

SERVER-13687 Results of $near query on compound multi-key 2dsphere index are now sorted by distance.

Write Operations¶

SERVER-13802 Insert field validation no longer stops at first Timestamp() field.

Replication¶

SERVER-13993 Fixed: “log a message when shouldChangeSyncTarget() believes a node should change sync targets”
SERVER-13976 Fixed: “Cloner needs to detect failure to create collection”

Sharding¶

SERVER-13616 Resolved: “‘type 7’ (OID) error when acquiring distributed lock for first time”
SERVER-13812 Now catches exception thrown by getShardsForQuery for geo query.
SERVER-14138 mongos will now correctly target multiple shards for nested field shard key predicates.
SERVER-11332 Fixed: “Authentication requests delayed if first config server is unresponsive”

Map/Reduce¶

SERVER-14186 Resolved: “rs.stepDown during mapReduce causes fassert in logOp”
SERVER-13981 Temporary map/reduce collections are now correctly replicated to secondaries.

Storage¶

SERVER-13750 convertToCapped on empty collection no longer aborts after invariant() failure.
SERVER-14056 Moving large collection across databases with renameCollection no longer triggers fatal assertion.
SERVER-14082 Fixed: “Excessive freelist scanning for MaxBucket”
SERVER-13737 CollectionOptions parser now skips non-numeric for “size”/”max” elements if values non-numeric.

Build and Packaging¶

SERVER-13950 MongoDB Enterprise now includes required dependency list.
SERVER-13862 Support for mongodb-org-server installation 2.6.1-1 on RHEL5 via RPM.
SERVER-13724 Added SCons flag to override treating all warnings as errors.

Diagnostics¶

SERVER-13587 Resolved: “ndeleted in system.profile documents reports 1 too few documents removed”
SERVER-13368 Improved exposure of timing information in currentOp.

Administration¶

SERVER-13954 security.javascriptEnabled option is now available in the YAML configuration file.

Tools¶

SERVER-10464 mongodump can now query oplog.$main and oplog.rs when using --dbpath.
SERVER-13760 mongoexport can now handle large timestamps on Windows.

Shell¶

SERVER-13865 Shell now returns correct WriteResult for compatibility-mode upsert with non-OID equality predicate on _id field.
SERVER-13037 Fixed typo in error message for “compatibility mode”.

Internal Code¶

SERVER-13794 Fixed: “Unused snapshot history consuming significant heap space”
SERVER-13446 Removed Solaris builds dependency on ILLUMOS libc.
SERVER-14092 MongoDB upgrade 2.4 to 2.6 check no longer returns an error in internal collections.
SERVER-14000 Added new lsb file location for Debian 7.1

Testing¶

SERVER-13723 Stabilized tags.js after a change in its timeout when it was ported to use write commands.
SERVER-13494 Fixed: “setup_multiversion_mongodb.py doesn’t download 2.4.10 because of non-numeric version sorting”
SERVER-13603 Fixed: “Test suites with options tests fail when run with --nopreallocj”
SERVER-13948 Fixed: “awaitReplication() failures related to getting a config version from master causing test failures”
SERVER-13839 Fixed sync2.js failure.
SERVER-13972 Fixed connections_opened.js failure.
SERVER-13712 Reduced peak disk usage of test suites.
SERVER-14249 Added tests for querying oplog via mongodump using --dbpath
SERVER-10462 Fixed: “Windows file locking related buildbot failures”

2.6.1 – Changes¶

Stability¶

SERVER-13739 Repair database failure can delete database files

Build and Packaging¶

SERVER-13287 Addition of debug symbols has doubled compile time
SERVER-13563 Upgrading from 2.4.x to 2.6.0 via yum clobbers configuration file
SERVER-13691 yum and apt “stable” repositories contain release candidate 2.6.1-rc0 packages
SERVER-13515 Cannot install MongoDB as a service on Windows

Querying¶

SERVER-13066 Negations over multikey fields do not use index
SERVER-13495 Concurrent GETMORE and KILLCURSORS operations can cause race condition and server crash
SERVER-13503 The $where operator should not be allowed under $elemMatch
SERVER-13537 Large skip and and limit values can cause crash in blocking sort stage
SERVER-13557 Incorrect negation of $elemMatch value in 2.6
SERVER-13562 Queries that use tailable cursors do not stream results if skip() is applied
SERVER-13566 Using the OplogReplay flag with extra predicates can yield incorrect results
SERVER-13611 Missing sort order for compound index leads to unnecessary in-memory sort
SERVER-13618 Optimization for sorted $in queries not applied to reverse sort order
SERVER-13661 Increase the maximum allowed depth of query objects
SERVER-13664 Query with $elemMatch using a compound multikey index can generate incorrect results
SERVER-13677 Query planner should traverse through $all while handling $elemMatch object predicates
SERVER-13766 Dropping index or collection while $or query is yielding triggers fatal assertion

Geospatial¶

SERVER-13666 $near queries with out-of-bounds points in legacy format can lead to crashes
SERVER-13540 The geoNear command no longer returns distance in radians for legacy point
SERVER-13486: The geoNear command can create too large BSON objects for aggregation.

Replication¶

SERVER-13500 Changing replica set configuration can crash running members
SERVER-13589 Background index builds from a 2.6.0 primary fail to complete on 2.4.x secondaries
SERVER-13620 Replicated data definition commands will fail on secondaries during background index build
SERVER-13496 Creating index with same name but different spec in mixed version replicaset can abort replication

Sharding¶

SERVER-12638 Initial sharding with hashed shard key can result in duplicate split points
SERVER-13518 The _id field is no longer automatically generated by mongos when missing
SERVER-13777 Migrated ranges waiting for deletion do not report cursors still open

Security¶

SERVER-9358 Log rotation can overwrite previous log files
SERVER-13644 Sensitive credentials in startup options are not redacted and may be exposed
SERVER-13441 Inconsistent error handling in user management shell helpers

Write Operations¶

SERVER-13466 Error message in collection creation failure contains incorrect namespace
SERVER-13499 Yield policy for batch-inserts should be the same as for batch-updates/deletes
SERVER-13516 Array updates on documents with more than 128 BSON elements may crash mongod

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