devel

-----

* increase default collection lock timeout from 30 to 900 seconds

* added function `db._engine()` for retrieval of storage engine information at

server runtime

There is also an HTTP REST handler at GET /_api/engine that returns engine

information.

* require at least cmake 3.2 for building ArangoDB

* make arangod start with less V8 JavaScript contexts

This speeds up the server start (a little bit) and makes it use less memory.

Whenever a V8 context is needed by a Foxx action or some other operation and

there is no usable V8 context, a new one will be created dynamically now.

Up to `--javascript.v8-contexts` V8 contexts will be created, so this option

will change its meaning. Previously as many V8 contexts as specified by this

option were created at server start, and the number of V8 contexts did not

change at runtime. Now up to this number of V8 contexts will be in use at the

same time, but the actual number of V8 contexts is dynamic.

The garbage collector thread will automatically delete unused V8 contexts after

a while. The number of spare contexts will go down to as few as configured in

the new option `--javascript.v8-contexts-minimum`. Actually that many V8 contexts

are also created at server start.

The first few requests in new V8 contexts will take longer than in contexts

that have been there already. Performance may therefore suffer a bit for the

initial requests sent to ArangoDB or when there are only few but performance-

critical situations in which new V8 contexts will be created. If this is a

concern, it can easily be fixed by setting `--javascipt.v8-contexts-minimum`

and `--javascript.v8-contexts` to a relatively high value, which will guarantee

that many number of V8 contexts to be created at startup and kept around even

when unused.

Waiting for an unused V8 context will now also abort if no V8 context can be

acquired/created after 120 seconds.

* improved diagnostic messages written to logfiles by supervisor process

* fixed issue #2367

* added "bindVars" to attributes of currently running and slow queries

* added "jsonl" as input file type for arangoimp

* upgraded version of bundled zlib library from 1.2.8 to 1.2.11

* added input file type `auto` for arangoimp so it can automatically detect the

type of the input file from the filename extension

* fixed variables parsing in GraphQL

* added `--translate` option for arangoimp to translate attribute names from

the input files to attriubte names expected by ArangoDB

The `--translate` option can be specified multiple times (once per translation

to be executed). The following example renames the "id" column from the input

file to "_key", and the "from" column to "_from", and the "to" column to "_to":

arangoimp --type csv --file data.csv --translate "id=_key" --translate "from=_from" --translate "to=_to"

`--translate` works for CSV and TSV inputs only.

* changed default value for `--server.max-packet-size` from 128 MB to 256 MB

* fixed issue #2350

* fixed issue #2349

* fixed issue #2346

* fixed issue #2342

* change default string truncation length from 80 characters to 256 characters for

`print`/`printShell` functions in ArangoShell and arangod. This will emit longer

prefixes of string values before truncating them with `...`, which is helpful

for debugging.

* always validate incoming JSON HTTP requests for duplicate attribute names

Incoming JSON data with duplicate attribute names will now be rejected as

invalid. Previous versions of ArangoDB only validated the uniqueness of

attribute names inside incoming JSON for some API endpoints, but not

consistently for all APIs.

* don't let read-only transactions block the WAL collector

* allow passing own `graphql-sync` module instance to Foxx GraphQL router

* arangoexport can now export to csv format

* arangoimp: fixed issue #2214

v3.2.alpha2 (2017-02-20)

------------------------

* ui: fixed issue #2065

* ui: fixed a dashboard related memory issue

* Internal javascript rest actions will now hide their stack traces to the client

unless maintainer mode is activated. Instead they will always log to the logfile

* Removed undocumented internal HTTP API:

* PUT _api/edges

The documented GET _api/edges and the undocumented POST _api/edges remains unmodified.

* updated V8 version to 5.7.0.0

* change undocumented behaviour in case of invalid revision ids in

If-Match and If-None-Match headers from 400 (BAD) to 412 (PRECONDITION

FAILED).

* change undocumented behaviour in case of invalid revision ids in

JavaScript document operations from 1239 ("illegal document revision")

to 1200 ("conflict").

* added data export tool, arangoexport.

arangoexport can be used to export collections to json, jsonl or xml

and export a graph or collections to xgmml.

* fixed a race condition when closing a connection

* raised default hard limit on threads for very small to 64

* fixed negative counting of http connection in UI

v3.2.alpha1 (2017-02-05)

------------------------

* added figure `httpRequests` to AQL query statistics

* removed revisions cache intermediate layer implementation

* obsoleted startup options `--database.revision-cache-chunk-size` and

`--database.revision-cache-target-size`

* fix potential port number over-/underruns

* added startup option `--log.shorten-filenames` for controlling whether filenames

in log message should be shortened to just the filename with the absolute path

* removed IndexThreadFeature, made `--database.index-threads` option obsolete

* changed index filling to make it more parallel, dispatch tasks to boost::asio

* more detailed stacktraces in Foxx apps

* generated Foxx services now use swagger tags

v3.1.17 (2017-XX-XX)

--------------------

* ui - fixed smart graph option not appearing

* fixed issue #2389

* fixed issue #2400

v3.1.16 (2017-03-27)

--------------------

* fixed issue #2392

* try to raise file descriptors to at least 8192, warn otherwise

* ui - aql editor improvements + updated ace editor version (memory leak)

* fixed lost HTTP requests

* ui - fixed some event issues

* avoid name resolution when given connection string is a valid ip address

* helps with issue #1842, bug in COLLECT statement in connection with LIMIT.

* fix locking bug in cluster traversals

* increase lock timeout defaults

* increase various cluster timeouts

* limit default target size for revision cache to 1GB, which is better for

tight RAM situations (used to be 40% of (totalRAM - 1GB), use

--database.revision-cache-target-size <VALUEINBYTES> to get back the

old behaviour

* fixed a bug with restarted servers indicating status as "STARTUP"

rather that "SERVING" in Nodes UI.

v3.1.15 (2017-03-20)

--------------------

* add logrotate configuration as requested in #2355

* fixed issue #2376

* ui - changed document api due a chrome bug

* ui - fixed a submenu bug

* added endpoint /_api/cluster/endpoints in cluster case to get all

coordinator endpoints

* fix documentation of /_api/endpoint, declaring this API obsolete.

* Foxx response objects now have a `type` method for manipulating the content-type header

* Foxx tests now support `xunit` and `tap` reporters

v3.1.14 (2017-03-13)

--------------------

* ui - added feature request (multiple start nodes within graph viewer) #2317

* added missing locks to authentication cache methods

* ui - added feature request (multiple start nodes within graph viewer) #2317

* ui - fixed wrong merge of statistics information from different coordinators

* ui - fixed issue #2316

* ui - fixed wrong protocol usage within encrypted environment

* fixed compile error on Mac Yosemite

* minor UI fixes

v3.1.13 (2017-03-06)

--------------------

* fixed variables parsing in GraphQL

* fixed issue #2214

* fixed issue #2342

* changed thread handling to queue only user requests on coordinator

* use exponential backoff when waiting for collection locks

* repair short name server lookup in cluster in the case of a removed

server

v3.1.12 (2017-02-28)

--------------------

* disable shell color escape sequences on Windows

* fixed issue #2326

* fixed issue #2320

* fixed issue #2315

* fixed a race condition when closing a connection

* raised default hard limit on threads for very small to 64

* fixed negative counting of http connection in UI

* fixed a race when renaming collections

* fixed a race when dropping databases

v3.1.11 (2017-02-17)

--------------------

* fixed a race between connection closing and sending out last chunks of data to clients

when the "Connection: close" HTTP header was set in requests

* ui: optimized smart graph creation usability

* ui: fixed #2308

* fixed a race in async task cancellation via `require("@arangodb/tasks").unregisterTask()`

* fixed spuriously hanging threads in cluster AQL that could sit idle for a few minutes

* fixed potential numeric overflow for big index ids in index deletion API

* fixed sort issue in cluster, occurring when one of the local sort buffers of a

GatherNode was empty

* reduce number of HTTP requests made for certain kinds of join queries in cluster,

leading to speedup of some join queries

* supervision deals with demised coordinators correctly again

* implement a timeout in TraverserEngineRegistry

* agent communication reduced in large batches of append entries RPCs

* inception no longer estimates RAFT timings

* compaction in agents has been moved to a separate thread

* replicated logs hold local timestamps

* supervision jobs failed leader and failed follower revisited for

function in precarious stability situations

* fixed bug in random number generator for 64bit int

v3.1.10 (2017-02-02)

--------------------

* updated versions of bundled node modules:

- joi: from 8.4.2 to 9.2.0

- joi-to-json-schema: from 2.2.0 to 2.3.0

- sinon: from 1.17.4 to 1.17.6

- lodash: from 4.13.1 to 4.16.6

* added shortcut for AQL ternary operator

instead of `condition ? true-part : false-part` it is now possible to also use a

shortcut variant `condition ? : false-part`, e.g.

FOR doc IN docs RETURN doc.value ?: 'not present'

instead of

FOR doc IN docs RETURN doc.value ? doc.value : 'not present'

* fixed wrong sorting order in cluster, if an index was used to sort with many

shards.

* added --replication-factor, --number-of-shards and --wait-for-sync to arangobench

* turn on UTF-8 string validation for VelocyPack values received via VST connections

* fixed issue #2257

* upgraded Boost version to 1.62.0

* added optional detail flag for db.<collection>.count()

setting the flag to `true` will make the count operation returned the per-shard

counts for the collection:

db._create("test", { numberOfShards: 10 });

for (i = 0; i < 1000; ++i) {

db.test.insert({value: i});

}

db.test.count(true);

{

"s100058" : 99,

"s100057" : 103,

"s100056" : 100,

"s100050" : 94,

"s100055" : 90,

"s100054" : 122,

"s100051" : 109,

"s100059" : 99,

"s100053" : 95,

"s100052" : 89

}

* added optional memory limit for AQL queries:

db._query("FOR i IN 1..100000 SORT i RETURN i", {}, { options: { memoryLimit: 100000 } });

This option limits the default maximum amount of memory (in bytes) that a single

AQL query can use.

When a single AQL query reaches the specified limit value, the query will be

aborted with a *resource limit exceeded* exception. In a cluster, the memory

accounting is done per shard, so the limit value is effectively a memory limit per

query per shard.

The global limit value can be overriden per query by setting the *memoryLimit*

option value for individual queries when running an AQL query.

* added server startup option `--query.memory-limit`

* added convenience function to create vertex-centric indexes.

Usage: `db.collection.ensureVertexCentricIndex("label", {type: "hash", direction: "outbound"})`

That will create an index that can be used on OUTBOUND with filtering on the

edge attribute `label`.

* change default log output for tools to stdout (instead of stderr)

* added option -D to define a configuration file environment key=value

* changed encoding behavior for URLs encoded in the C++ code of ArangoDB:

previously the special characters `-`, `_`, `~` and `.` were returned as-is

after URL-encoding, now `.` will be encoded to be `%2e`.

This also changes the behavior of how incoming URIs are processed: previously

occurrences of `..` in incoming request URIs were collapsed (e.g. `a/../b/` was

collapsed to a plain `b/`). Now `..` in incoming request URIs are not collapsed.

* Foxx request URL suffix is no longer unescaped

* @arangodb/request option json now defaults to `true` if the response body is not empty and encoding is not explicitly set to `null` (binary).

The option can still be set to `false` to avoid unnecessary attempts at parsing the response as JSON.

* Foxx configuration values for unknown options will be discarded when saving the configuration in production mode using the web interface

* module.context.dependencies is now immutable

* process.stdout.isTTY now returns `true` in arangosh and when running arangod with the `--console` flag

* add support for Swagger tags in Foxx

v3.1.9 (XXXX-XX-XX)

-------------------

* macos CLI package: store databases and apps in the users home directory

* ui: fixed re-login issue within a non system db, when tab was closed

* fixed a race in the VelocyStream Commtask implementation

* fixed issue #2256

v3.1.8 (2017-01-09)

-------------------

* add Windows silent installer

* add handling of debug symbols during Linux & windows release builds.

* fixed issue #2181

* fixed issue #2248: reduce V8 max old space size from 3 GB to 1 GB on 32 bit systems

* upgraded Boost version to 1.62.0

* fixed issue #2238

* fixed issue #2234

* agents announce new endpoints in inception phase to leader

* agency leadership accepts updatet endpoints to given uuid

* unified endpoints replace localhost with 127.0.0.1

* fix several problems within an authenticated cluster

v3.1.7 (2016-12-29)

-------------------

* fixed one too many elections in RAFT

* new agency comm backported from devel

v3.1.6 (2016-12-20)

-------------------

* fixed issue #2227

* fixed issue #2220

* agency constituent/agent bug fixes in race conditions picking up

leadership

* supervision does not need waking up anymore as it is running

regardless

* agents challenge their leadership more rigorously

v3.1.5 (2016-12-16)

-------------------

* lowered default value of `--database.revision-cache-target-size` from 75% of

RAM to less than 40% of RAM

* fixed issue #2218

* fixed issue #2217

* Foxx router.get/post/etc handler argument can no longer accidentally omitted

* fixed issue #2223

v3.1.4 (2016-12-08)

-------------------

* fixed issue #2211

* fixed issue #2204

* at cluster start, coordinators wait until at least one DBserver is there,

and either at least two DBservers are there or 15s have passed, before they

initiate the bootstrap of system collections.

* more robust agency startup from devel

* supervision's AddFollower adds many followers at once

* supervision has new FailedFollower job

* agency's Node has new method getArray

* agency RAFT timing estimates more conservative in waitForSync

scenario

* agency RAFT timing estimates capped at maximum 2.0/10.0 for low/high

v3.1.3 (2016-12-02)

-------------------

* fix a traversal bug when using skiplist indexes:

if we have a skiplist of ["a", "unused", "_from"] and a traversal like:

FOR v,e,p IN OUTBOUND @start @@edges

FILTER p.edges[0].a == 'foo'

RETURN v

And the above index applied on "a" is considered better than EdgeIndex, than

the executor got into undefined behaviour.

* fix endless loop when trying to create a collection with replicationFactor: -1

v3.1.2 (2016-11-24)

-------------------

* added support for descriptions field in Foxx dependencies

* (Enterprise only) fixed a bug in the statistic report for SmartGraph traversals.

Now they state correctly how many documents were fetched from the index and how many

have been filtered.

* Prevent uniform shard distribution when replicationFactor == numServers

v3.1.1 (2016-11-15)

-------------------

* fixed issue #2176

* fixed issue #2168

* display index usage of traversals in AQL explainer output (previously missing)

* fixed isuse #2163

* preserve last-used HLC value across server starts

* allow more control over handling of pre-3.1 _rev values

this changes the server startup option `--database.check-30-revisions` from a boolean (true/false)

parameter to a string parameter with the following possible values:

- "fail":

will validate _rev values of 3.0 collections on collection loading and throw an exception when invalid _rev values are found.

in this case collections with invalid _rev values are marked as corrupted and cannot be used in the ArangoDB 3.1 instance.

the fix procedure for such collections is to export the collections from 3.0 database with arangodump and restore them in 3.1 with arangorestore.

collections that do not contain invalid _rev values are marked as ok and will not be re-checked on following loads.

collections that contain invalid _rev values will be re-checked on following loads.

- "true":

will validate _rev values of 3.0 collections on collection loading and print a warning when invalid _rev values are found.

in this case collections with invalid _rev values can be used in the ArangoDB 3.1 instance.

however, subsequent operations on documents with invalid _rev values may silently fail or fail with explicit errors.

the fix procedure for such collections is to export the collections from 3.0 database with arangodump and restore them in 3.1 with arangorestore.

collections that do not contain invalid _rev values are marked as ok and will not be re-checked on following loads.

collections that contain invalid _rev values will be re-checked on following loads.

- "false":

will not validate _rev values on collection loading and not print warnings.

no hint is given when invalid _rev values are found.

subsequent operations on documents with invalid _rev values may silently fail or fail with explicit errors.

this setting does not affect whether collections are re-checked later.

collections will be re-checked on following loads if `--database.check-30-revisions` is later set to either `true` or `fail`.

The change also suppresses warnings that were printed when collections were restored using arangorestore, and the restore

data contained invalid _rev values. Now these warnings are suppressed, and new HLC _rev values are generated for these documents

as before.

* added missing functions to AQL syntax highlighter in web interface

* fixed display of `ANY` direction in traversal explainer output (direction `ANY` was shown as either

`INBOUND` or `OUTBOUND`)

* changed behavior of toJSON() function when serializing an object before saving it in the database

if an object provides a toJSON() function, this function is still called for serializing it.

the change is that the result of toJSON() is not stringified anymore, but saved as is. previous

versions of ArangoDB called toJSON() and after that additionally stringified its result.

This change will affect the saving of JS Buffer objects, which will now be saved as arrays of

bytes instead of a comma-separated string of the Buffer's byte contents.

* allow creating unique indexes on more attributes than present in shardKeys

The following combinations of shardKeys and indexKeys are allowed/not allowed:

shardKeys indexKeys

a a ok

a b not ok

a a b ok

a b a not ok

a b b not ok

a b a b ok

a b a b c ok

a b c a b not ok

a b c a b c ok

* fixed wrong version in web interface login screen (EE only)

* make web interface not display an exclamation mark next to ArangoDB version number 3.1

* fixed search for arbitrary document attributes in web interface in case multiple

search values were used on different attribute names. in this case, the search always

produced an empty result

* disallow updating `_from` and `_to` values of edges in Smart Graphs. Updating these

attributes would lead to potential redistribution of edges to other shards, which must be

avoided.

* fixed issue #2148

* updated graphql-sync dependency to 0.6.2

* fixed issue #2156

* fixed CRC4 assembly linkage

v3.1.0 (2016-10-29)

-------------------

* added AQL function `DISTANCE` to calculate the distance between two arbitrary

coordinates (haversine formula)

* fixed issue #2110

* added Auto-aptation of RAFT timings as calculations only

v3.1.rc2 (2016-10-10)

---------------------

* second release candidate

v3.1.rc1 (2016-09-30)

---------------------

* first release candidate

v3.1.alpha2 (2016-09-01)

------------------------

* added module.context.createDocumentationRouter to replace module.context.apiDocumentation

* bug in RAFT implementation of reads. dethroned leader still answered requests in isolation

* ui: added new graph viewer

* ui: aql-editor added tabular & graph display

* ui: aql-editor improved usability

* ui: aql-editor: query profiling support

* fixed issue #2109

* fixed issue #2111

* fixed issue #2075

* added AQL function `DISTANCE` to calculate the distance between two arbitrary

coordinates (haversine formula)

* rewrote scheduler and dispatcher based on boost::asio

parameters changed:

`--scheduler.threads` and `--server.threads` are now merged into a single one: `--server.threads`

hidden `--server.extra-threads` has been removed

hidden `--server.aql-threads` has been removed

hidden `--server.backend` has been removed

hidden `--server.show-backends` has been removed

hidden `--server.thread-affinity` has been removed

* fixed issue #2086

* fixed issue #2079

* fixed issue #2071

make the AQL query optimizer inject filter condition expressions referred to

by variables during filter condition aggregation.

For example, in the following query

FOR doc IN collection

LET cond1 = (doc.value == 1)

LET cond2 = (doc.value == 2)

FILTER cond1 || cond2

RETURN { doc, cond1, cond2 }

the optimizer will now inject the conditions for `cond1` and `cond2` into the filter

condition `cond1 || cond2`, expanding it to `(doc.value == 1) || (doc.value == 2)`

and making these conditions available for index searching.

Note that the optimizer previously already injected some conditions into other

conditions, but only if the variable that defined the condition was not used

elsewhere. For example, the filter condition in the query

FOR doc IN collection

LET cond = (doc.value == 1)

FILTER cond

RETURN { doc }

already got optimized before because `cond` was only used once in the query and

the optimizer decided to inject it into the place where it was used.

This only worked for variables that were referred to once in the query.

When a variable was used multiple times, the condition was not injected as

in the following query:

FOR doc IN collection

LET cond = (doc.value == 1)

FILTER cond

RETURN { doc, cond }

The fix for #2070 now will enable this optimization so that the query can

use an index on `doc.value` if available.

* changed behavior of AQL array comparison operators for empty arrays:

* `ALL` and `ANY` now always return `false` when the left-hand operand is an

empty array. The behavior for non-empty arrays does not change:

* `[] ALL == 1` will return `false`

* `[1] ALL == 1` will return `true`

* `[1, 2] ALL == 1` will return `false`

* `[2, 2] ALL == 1` will return `false`

* `[] ANY == 1` will return `false`

* `[1] ANY == 1` will return `true`

* `[1, 2] ANY == 1` will return `true`

* `[2, 2] ANY == 1` will return `false`

* `NONE` now always returns `true` when the left-hand operand is an empty array.

The behavior for non-empty arrays does not change:

* `[] NONE == 1` will return `true`

* `[1] NONE == 1` will return `false`

* `[1, 2] NONE == 1` will return `false`

* `[2, 2] NONE == 1` will return `true`

* added experimental AQL functions `JSON_STRINGIFY` and `JSON_PARSE`

* added experimental support for incoming gzip-compressed requests

* added HTTP REST APIs for online loglevel adjustments:

- GET `/_admin/log/level` returns the current loglevel settings

- PUT `/_admin/log/level` modifies the current loglevel settings

* PATCH /_api/gharial/{graph-name}/vertex/{collection-name}/{vertex-key}

- changed default value for keepNull to true

* PATCH /_api/gharial/{graph-name}/edge/{collection-name}/{edge-key}

- changed default value for keepNull to true

* renamed `maximalSize` attribute in parameter.json files to `journalSize`

The `maximalSize` attribute will still be picked up from collections that

have not been adjusted. Responses from the replication API will now also use

`journalSize` instead of `maximalSize`.

* added `--cluster.system-replication-factor` in order to adjust the

replication factor for new system collections

* fixed issue #2012

* added a memory expection in case V8 memory gets too low

* added Optimizer Rule for other indexes in Traversals

this allows AQL traversals to use other indexes than the edge index.

So traversals with filters on edges can now make use of more specific

indexes, e.g.

FOR v, e, p IN 2 OUTBOUND @start @@edge FILTER p.edges[0].foo == "bar"

will prefer a Hash Index on [_from, foo] above the EdgeIndex.

* fixed epoch computation in hybrid logical clock

* fixed thread affinity

* replaced require("internal").db by require("@arangodb").db

* added option `--skip-lines` for arangoimp

this allows skipping the first few lines from the import file in case the

CSV or TSV import are used

* fixed periodic jobs: there should be only one instance running - even if it

runs longer than the period

* improved performance of primary index and edge index lookups

* optimizations for AQL `[*]` operator in case no filter, no projection and

no offset/limit are used

* added AQL function `OUTERSECTION` to return the symmetric difference of its

input arguments

* Foxx manifests of installed services are now saved to disk with indentation

* Foxx tests and scripts in development mode should now always respect updated

files instead of loading stale modules

* When disabling Foxx development mode the setup script is now re-run

* Foxx now provides an easy way to directly serve GraphQL requests using the

`@arangodb/foxx/graphql` module and the bundled `graphql-sync` dependency

* Foxx OAuth2 module now correctly passes the `access_token` to the OAuth2 server

* added iconv-lite and timezone modules

* web interface now allows installing GitHub and zip services in legacy mode

* added module.context.createDocumentationRouter to replace module.context.apiDocumentation

* bug in RAFT implementation of reads. dethroned leader still answered

requests in isolation

* all lambdas in ClusterInfo might have been left with dangling references.

* Agency bug fix for handling of empty json objects as values.

* Foxx tests no longer support the Mocha QUnit interface as this resulted in weird

inconsistencies in the BDD and TDD interfaces. This fixes the TDD interface

as well as out-of-sequence problems when using the BDD before/after functions.

* updated bundled JavaScript modules to latest versions; joi has been updated from 8.4 to 9.2

(see [joi 9.0.0 release notes](https://github.com/hapijs/joi/issues/920) for information on

breaking changes and new features)

* fixed issue #2139

* updated graphql-sync dependency to 0.6.2

* fixed issue #2156

v3.0.13 (XXXX-XX-XX)

--------------------

* fixed issue #2315

* fixed issue #2210

v3.0.12 (2016-11-23)

--------------------

* fixed issue #2176

* fixed issue #2168

* fixed issues #2149, #2159

* fixed error reporting for issue #2158

* fixed assembly linkage bug in CRC4 module

* added support for descriptions field in Foxx dependencies

v3.0.11 (2016-11-08)

--------------------

* fixed issue #2140: supervisor dies instead of respawning child

* fixed issue #2131: use shard key value entered by user in web interface

* fixed issue #2129: cannot kill a long-run query

* fixed issue #2110

* fixed issue #2081

* fixed issue #2038

* changes to Foxx service configuration or dependencies should now be

stored correctly when options are cleared or omitted

* Foxx tests no longer support the Mocha QUnit interface as this resulted in weird

inconsistencies in the BDD and TDD interfaces. This fixes the TDD interface

as well as out-of-sequence problems when using the BDD before/after functions.

* fixed issue #2148

v3.0.10 (2016-09-26)

--------------------

* fixed issue #2072

* fixed issue #2070

* fixed slow cluster starup issues. supervision will demonstrate more

patience with db servers

v3.0.9 (2016-09-21)

-------------------

* fixed issue #2064

* fixed issue #2060

* speed up `collection.any()` and skiplist index creation

* fixed multiple issues where ClusterInfo bug hung agency in limbo

timeouting on multiple collection and database callbacks

v3.0.8 (2016-09-14)

-------------------

* fixed issue #2052

* fixed issue #2005

* fixed issue #2039

* fixed multiple issues where ClusterInfo bug hung agency in limbo

timeouting on multiple collection and database callbacks

v3.0.7 (2016-09-05)

-------------------

* new supervision job handles db server failure during collection creation.

v3.0.6 (2016-09-02)

-------------------

* fixed issue #2026

* slightly better error diagnostics for AQL query compilation and replication

* fixed issue #2018

* fixed issue #2015

* fixed issue #2012

* fixed wrong default value for arangoimp's `--on-duplicate` value

* fix execution of AQL traversal expressions when there are multiple

conditions that refer to variables set outside the traversal

* properly return HTTP 503 in JS actions when backend is gone

* supervision creates new key in agency for failed servers

* new shards will not be allocated on failed or cleaned servers

v3.0.5 (2016-08-18)

-------------------

* execute AQL ternary operator via C++ if possible

* fixed issue #1977

* fixed extraction of _id attribute in AQL traversal conditions

* fix SSL agency endpoint

* Minimum RAFT timeout was one order of magnitude to short.

* Optimized RAFT RPCs from leader to followers for efficiency.

* Optimized RAFT RPC handling on followers with respect to compaction.

* Fixed bug in handling of duplicates and overlapping logs