3.5.9

The MongoDB Node.js team is pleased to announce version 3.5.9 of the driver

Release Highlights

Use duration of handshake if no previous roundTripTime exists

The default roundTripTime of a ServerDescription is -1, which means if that value is used we can potentially calculate a negative roundTripTime. Instead, if no previous roundTripTime exists, we use the duration of the initial handshake.

the options [maxIdleTimeMS] is not supported

A number of new options were added when the CMAP compliant connection pool was introduced in 3.5.x. Unfortunately, these options were not documented properly. Now they are mentioned in the MongoClient documentation, with a notice that they are only supported with the unified topology.

TypeError: Reduce of empty array with no initial value

A fix in 3.5.8 which ensured proper filtering of servers during server selection exposed an issue in max staleness calculations when the topology type is ReplicaSetNoPrimary and no servers are currently known. In order to estimate an upper bound of max staleness when there is no primary, the most stale known server is known to compare the others to - if there are no known servers, you can't reduce the array!

Server monitoring is prevented under heavy request load

In certain very high load fail-over scenarios the driver is unable to reschedule a monitoring check in order to update its view of the topology for retryability. This would result in a high number of failed operations, as they were unable to determine a new viable server.

Documentation

Reference: http://mongodb.github.io/node-mongodb-native/3.5/
API: http://mongodb.github.io/node-mongodb-native/3.5/api/
Changelog: https://github.com/mongodb/node-mongodb-native/blob/3.5/HISTORY.md

We invite you to try the driver immediately, and report any issues to the NODE project.

Thanks very much to all the community members who contributed to this release!

Release Notes

Bug

• [NODE-2637] - connection pool options support for MongoClient
• [NODE-2641] - maxStalenessReducer fails on empty set of servers
• [NODE-2643] - Server monitoring is prevented under heavy request load
• [NODE-2652] - Use duration of initial handshake if no roundTripTime value exists for server

Improvement

• [NODE-2651] - Use consistent means of measuring time

3.5.8

The MongoDB Node.js team is pleased to announce version 3.5.8 of the driver

Release Highlights

Fixes for NEAREST latency window calculation

@adityapatadia helped uncover an issue with our server selection logic which
filtered out servers after evaluating whether they were in the latency window.
This meant that non-viable servers were considered during the window calculation
and would render certain viable servers unviable.

BulkWriteError writeErrors property

@vkarpov15 submitted a patch to always include writeErrors on a BulkWriteError.
We have logic to set the message of BulkWriteError to the message of the first
error encountered if there is only one error. Unfortunately, this logic removed
the writeErrors field when doing that, so users could be faced with an error
which conditionally changed shape.

Memory leak in timed out wait queue members

@dead-horse identified a memory leak in the new connection pool where wait queue
members which timed out might be left in the queue indefinitely under sufficient
load. The fix here was to ensure that all wait queue members are flushed during
wait queue processing before evaluating whether there were available sockets to
process new requests.

Implicit sessions cleanup improvements

Once @dead-horse was able to patch the connection pool memory leak, they also
identified a edge case where implicit sessions could be leaked in a very specific
error condition. The logic to release implicit sessions was simplified, preventing
this from happening in the future

Unordered bulk writes continue-on-error

A bug introduced last summer prevented unordered bulk write operations from
continuing after the first write error - one of the most important features of
being an unordered operation. We now properly support this feature again.

journal in connection string is ignored

@nknighter filed a report that the journal option was ignored when provided
via the connection string. The paramater j was supported both through the
connection string and explicit added to MongoClient options, but the official
documentation for connection strings support a journal option.

Documentation

Reference: http://mongodb.github.io/node-mongodb-native/3.5/
API: http://mongodb.github.io/node-mongodb-native/3.5/api/
Changelog: https://github.com/mongodb/node-mongodb-native/blob/3.5/HISTORY.md

We invite you to try the driver immediately, and report any issues to the NODE project.

Thanks very much to all the community members who contributed to this release!

Release Notes

Bug

• [NODE-2407] - UnifiedTopology + near read makes application crash with timeout error when one of replica server is down
• [NODE-2413] - The node process enters an infinite loop at the pool and causes OOM
• [NODE-2442] - journal=true is ignored in connection string
• [NODE-2548] - Change streams do not resume from errors
• [NODE-2565] - Change stream should not check for NonResumableChangeStreamError label
• [NODE-2619] - Unordered bulk write aborts on first encountered error
• [NODE-2625] - BulkWriteError should always have a writeErrors field

Task

• [NODE-2478] - Use white list for change stream resumability
• [NODE-2598] - Change stream close refactor
• [NODE-2605] - Refactor shared test helpers to improve usability

Improvement

• [NODE-2522] - Remove ElectionInProgress (216) from ResumableChangeStreamError
• [NODE-2571] - Don't use admin database for FLE tests
• [NODE-2630] - Simplify code path for ending implicit sessions in cursors

3.5.7

The MongoDB Node.js team is pleased to announce version 3.5.7 of the driver

Release Highlights

Warning: Accessing non-existent property 'count' of module exports inside circular dependency

Work earlier this year left some dead code in our operations code, resulting in this warning message reported by multiple users. While we still have a few cycles in our codebase yet, this will quiet Node.js 14's circular dependency warnings.

Sessions are only acquired when operations are executed

Drivers use an implicit session for all operations where an explicit session is not provided. A subtle bug was introduced when session support was implemented where implicit sessions were created and assigned to operations even if they were about to sit in a queue waiting for execution. This results in the driver creating many sessions rather than reusing pooled ones. The fix is to ensure a session is only checked out of the pool when the operation is about to be written to a server.

Thanks very much to all the community members who contributed to this release!

Release Notes

Bug

• [NODE-2536] - Circular dependency in Node.js 14 nightly
• [NODE-2552] - Server session creation grows unbounded with every operation call

Improvement

• [NODE-2534] - Document options supported by the unified topology
• [NODE-2560] - Make 'reIndex' a standalone-only command

3.5.6

The MongoDB Node.js team is pleased to announce version 3.5.6 of the driver

Release Highlights

Regression in map when cursor used as a stream

@dobesv helped identify a regression where a map function would be applied twice
if defined on a cursor, and that cursor was used to stream data.

TypeError: Cannot read property 'code' of undefined

User @linus-hologram originally reported an issue with a TypeError when the lambda
passed to the withTransaction helper rejected with a null value. @vkarpov15
submitted the fix.

readPreferenceTags interpreted as an array

A bug was fixed where readPreferenceTags with a single value in the connection
string was not properly interpreted as an array of tags. This prevented the
Use Analytics Nodes to Isolate Workload guidance from working
correctly.

Cannot set property 'isDirty' of null

User @sean-daley reported seeing this in an AWS Lambda environment, but has proven to
be somewhat of a heisenbug. We are rolling out a fix here that ensures sessions
(implicit or not) are not used after they have been explicitly ended.

Thanks very much to all the community members who contributed to this release!

Release Notes

Bug

• [NODE-2503] - Cursor ReadStream applies map function twice
• [NODE-2515] - TypeError when transaction is rejected with empty reason
• [NODE-2541] - readPreferenceTags are not interpreted as an array
• [NODE-2545] - Cannot set property 'isDirty' of null
• [NODE-2549] - Unknown topology should return empty array for server selection with read preference

3.5.5

The MongoDB Node.js team is pleased to announce version 3.5.5 of the driver

Release Highlights

Regression in hasNext when using a cursor with a limit

@peterbroadhurst helped point out a regression introduced in v3.5.4 where using hasNext
on a cusor with a limit would not return the full set of results.

Ignored topology updates cause servers to fall out of latency window

A change introduced across all MongoDB drivers, and in particular v3.5.0 of the Node.js
driver, attempted to prevent needless duplicate topologyDescriptionChanged topology events
by introducing a ServerDescription equality operator. Since equality does not take the
lastUpdateTime and lastWriteDate fields of an ismaster into account, the driver could
eventually consider servers non-suitable for server selection, since they would fall out
of the latency window.
All updates are considered viable for topology updates now, and only event emission is
gated by ServerDescription equality.

Memory leaks with Node.js v12+

The legacy topology types (in particular if you were connected to a replic set) used a
custom Timeout class to wrap a timer. Unfortunately, the class depended on an undocumented,
private variable _called, which was removed in Node.js v12. This would lead to the driver
thinking the timeout never occurred, and therefore never releasing the object for garbage
collection. We recommend users of the legacy topology types immediately update to this
version of the driver, or use the Unified Topology which is unaffected by this bug.

TypeError: Cannot read property 'Symbol(cancelled)' of undefined

@erfanium and @Paic helped us identify an issue in rare failover events where multiple
requests to process the server selection queue would result in an attempted property
access of an undefined variable.

promiseLibrary not respected by newly introduced maybePromise helper

@TobyEalden pointed out that an internal refactor to use a helper to optionally
return a Promise for top level API methods was not, in fact, using a custom
promise library if one was provided!

Thanks very much to all the community members who contributed to this release!

Release Notes

Bug

• [NODE-2460] - Memory Leak with ReplSet and NodeJS v12
• [NODE-2472] - TypeError on server available with useUnifiedTopology: true
• [NODE-2474] - Server_Description update with lastUpdateTime / lastWriteDate fields is ignored in topology
• [NODE-2480] - TypeError after reconnecting
• [NODE-2483] - Regression using hasNext on cursor with limit
• [NODE-2490] - promiseLibrary option is not honoured

Does any of this look wrong? Please let us know.

See the full diff on Github. The new version differs by 61 commits:

• chore(release): 3.5.9
• test: two uncaught change stream test methods which leak sessions
• fix: use duration of handshake if no previous roundTripTime exists
• refactor: use common methods for duration calculations
• doc: document options supported by the new CMAP connection pool
• fix: use async interruptable interval for server monitoring
• feat: introduce an interruptable async interval timer
• test: fix a number of our most notorious flakey tests
• test: move wtfnode invocation to signal handlers on main test runner
• fix: don't try to calculate sMax if there are no viable servers
• chore(release): 3.5.8
• fix: ensure implicit sessions are ended consistently
• fix: always clear cancelled wait queue members during processing
• fix: always include `writeErrors` on a `BulkWriteError` instance
• fix: unordered bulk write should attempt to execute all batches
• fix: filter servers before applying reducers
• fix(ChangeStream): should resume from errors when iterating
• test: improve shared helpers
• fix: honor journal=true in connection string (#2359)
• refactor(ChangeStream): use maybePromise for close, improve tests
• test: ignore error for missing `killAllSessions` on legacy versions
• refactor: don't use `admin` database in CSFLE tests
• fix(ChangeStream): whitelist resumable errors (#2337)
• test: use a different conflicting option for index error validation
• chore(release): 3.5.7
• refactor(ChangeStream): use maybePromise for next/hasNext
• docs: fix event names in gridFS tutorial
• chore: update snappy version to fix issue with node v4
• doc: document options supported by the unified topology
• test: reduce flakiness of socket timeout test
• fix: limit growth of server sessions through lazy acquisition
• fix: remove circular dependency warnings on node 14
• test: temporarily skip sharded transactions tests
• chore: update package lock to depend on latest bson version
• test: remove replicaset topology from reIndex tests
• test: lint the driver in a single evergreen task
• chore(release): 3.5.6
• chore: require bson 1.1.4 or higher
• test: wait for mock server creation before using it
• fix: only mark server session dirty if the client session is alive
• docs: Fix typo in Collection#find param
• fix: always return empty array for selection on unknown topology
• Revert "fix: createCollection only uses listCollections in strict mode"
• fix: single `readPreferenceTags` should be parsed as an array
• fix: createCollection only uses listCollections in strict mode
• fix: don't throw if `withTransaction()` callback rejects with a null reason
• chore: remove superfluous build variants
• chore: remove exotic build configurations
• fix: polyfill for util.promisify
• fix(cursor): transforms should only be applied once to documents
• chore(release): 3.5.5
• fix: multiple concurrent attempts to process the queue may fail
• fix: pass optional promise lib to maybePromise
• NODE-2474: update equal server description (#2260)
• test: ensure mock server is setup before continuing with tests
• fix: correctly use template string for connection string error message
• test: use a reduced `minHeartbeatFrequencyMS` for spec test runner
• fix(cursor): hasNext consumes documents on cursor with limit
• docs: update community links to use MongoDB Community forums
• docs: fix typo and formatting of bulletted lists
• fix: don't depend on private node api for `Timeout` wrapper

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