Commit Graph

89 Commits

Author SHA1 Message Date
Dimitris Athanasiou 894fb97ad7
[ML][TEST] Use java 11 valid time format in DataDescriptionTests (#31817)
It seems that java 11 tightened some validations with regard to
time formats. The random instance creator was setting an odd
time format to the data description which is invalid when run
with java 11. This commit changes it to a valid format.
2018-07-05 13:56:54 +01:00
Alpar Torok cf2295b408
Add JDK11 support and enable in CI (#31644)
* Upgrade bouncycastle

Required to fix
`bcprov-jdk15on-1.55.jar; invalid manifest format `
on jdk 11

* Downgrade bouncycastle to avoid invalid manifest

* Add checksum for new jars

* Update tika permissions for jdk 11

* Mute test failing on jdk 11

* Add JDK11 to CI

* Thread#stop(Throwable) was removed

http://mail.openjdk.java.net/pipermail/core-libs-dev/2018-June/053536.html

* Disable failing tests #31456

* Temprorarily disable doc tests

To see if there are other failures on JDK11

* Only blacklist specific doc tests

* Disable only failing tests in ingest attachment plugin

* Mute failing HDFS tests #31498

* Mute failing lang-painless tests #31500

* Fix backwards compatability builds

Fix JAVA version to 10 for ES 6.3

* Add 6.x to bwx -> java10

* Prefix out and err from buildBwcVersion for readability

```
> Task :distribution:bwc:next-bugfix-snapshot:buildBwcVersion
  [bwc] :buildSrc:compileJava
  [bwc] WARNING: An illegal reflective access operation has occurred
  [bwc] WARNING: Illegal reflective access by org.codehaus.groovy.reflection.CachedClass (file:/home/alpar/.gradle/wrapper/dists/gradle-4.5-all/cg9lyzfg3iwv6fa00os9gcgj4/gradle-4.5/lib/groovy-all-2.4.12.jar) to method java.lang.Object.finalize()
  [bwc] WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.reflection.CachedClass
  [bwc] WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
  [bwc] WARNING: All illegal access operations will be denied in a future release
  [bwc] :buildSrc:compileGroovy
  [bwc] :buildSrc:writeVersionProperties
  [bwc] :buildSrc:processResources
  [bwc] :buildSrc:classes
  [bwc] :buildSrc:jar

```

* Also set RUNTIME_JAVA_HOME for bwcBuild

So that we can make sure it's not too new for the build to understand.

* Align bouncycastle dependency

* fix painles array tets

closes #31500

* Update jar checksums

* Keep 8/10 runtime/compile untill consensus builds on 11

* Only skip failing tests if running on Java 11

* Failures are dependent of compile java version not runtime

* Condition doc test exceptions on compiler java version as well

* Disable hdfs tests based on runtime java

* Set runtime java to minimum supported for bwc

* PR review

* Add comment with ticket for forbidden apis
2018-07-05 03:24:01 +00:00
Simon Willnauer 3f2a241b7f
Detach Transport from TransportService (#31727)
Today TransportService is tightly coupled with Transport since it
requires an instance of TransportService in order to receive responses
and send requests. This is mainly due to the Request and Response handlers
being maintained in TransportService but also because of the lack of a proper 
callback interface.

This change moves request handler registry and response handler registration into
Transport and adds all necessary methods to `TransportConnectionListener` in order
to remove the `TransportService` dependency from `Transport`
Transport now accepts one or more `TransportConnectionListener` instances that are
executed sequentially in a blocking fashion.
2018-07-04 11:32:35 +02:00
Dimitris Athanasiou 896317fe36
[ML] Limit ML filter items to 10K (#31731)
Add hard limit to the number of items
a filter may have. This serves to protect
from excessive overhead due to the filters
taking too much memory or lookups becoming
too expensive.
2018-07-04 10:25:00 +01:00
Hendrik Muhs e9f8442bee
[ML] Return statistics about forecasts as part of the jobsstats and usage API (#31647)
This change adds stats about forecasts, to the jobstats api as well as xpack/_usage. The following 
information is collected:

_xpack/ml/anomaly_detectors/{jobid|_all}/_stats:

 -  total number of forecasts
 -  memory statistics (mean/min/max)
 -  runtime statistics
 -  record statistics
 -  counts by status

_xpack/usage

 -  collected by job status as well as overall (_all):
     -  total number of forecasts
     -  number of jobs that have at least 1 forecast
     -  memory, runtime, record statistics
     -  counts by status

Fixes #31395
2018-07-04 08:15:45 +02:00
Ioannis Kakavas 49b977ba7c
resolveHasher defaults to NOOP (#31723)
* Default resolveFromHash to Hasher.NOOP

This changes the default behavior when resolving the hashing
algorithm from unrecognised hash strings, which was introduced in
 #31234

A hash string that doesn't start with an algorithm identifier can
either be a malformed/corrupted hash or a plaintext password when
Hasher.NOOP is used(against warnings).
Do not make assumptions about which of the two is true for such
strings and default to Hasher.NOOP. Hash verification will subsequently
fail for malformed hashes.
Finally, do not log the potentially malformed hash as this can very
well be a plaintext password.

Resolves #31697
Reverts 58cf95a06f
2018-07-03 11:31:48 +03:00
Christoph Büscher 31aabe4bf9
Clean up double semicolon code typos (#31687) 2018-07-02 15:14:44 +02:00
Dimitris Athanasiou 8e838ea12e
[ML] Validate ML filter_id (#31535)
Like job and datafeed ids, the filter id
should be validated with the same rules
to avoid document ids that can be problematic.
2018-07-02 12:48:04 +01:00
Ioannis Kakavas 117e9066db
Support multiple system store types (#31650)
Support multiple system store types

When falling back to using the system keystore and - most usually -
truststore, do not assume that it will be a JKS store, but deduct
its type from {@code KeyStore#getDefaultKeyStoreType}. This allows
the use of any store type the Security Provider supports by setting
the keystore.type java security property.
2018-06-29 14:41:13 +03:00
Ioannis Kakavas db6b33978e
Configurable password hashing algorithm/cost (#31234)
Make password hashing algorithm/cost configurable for the 
stored passwords of users for the realms that this applies
(native, reserved). Replaces predefined choice of bcrypt with
cost factor 10.
This also introduces PBKDF2 with configurable cost
(number of iterations) as an algorithm option for password hashing
both for storing passwords and for the user cache.
Password hash validation algorithm selection takes into
consideration the stored hash prefix and only a specific number
of algorithnm and cost factor options for brypt and pbkdf2 are 
whitelisted and can be selected in the relevant setting.
2018-06-28 19:39:39 +03:00
Alpar Torok 8557bbab28
Upgrade gradle wrapper to 4.8 (#31525)
* Move to Gradle 4.8 RC1

* Use latest version of plugin

The current does not work with Gradle 4.8 RC1

* Switch to Gradle GA

* Add and configure build compare plugin

* add work-around for https://github.com/gradle/gradle/issues/5692

* work around https://github.com/gradle/gradle/issues/5696

* Make use of Gradle build compare with reference project

* Make the manifest more compare friendly

* Clear the manifest in compare friendly mode

* Remove animalsniffer from buildscript classpath

* Fix javadoc errors

* Fix doc issues

* reference Gradle issues in comments

* Conditionally configure build compare

* Fix some more doclint issues

* fix typo in build script

* Add sanity check to make sure the test task was replaced

Relates to #31324. It seems like Gradle has an inconsistent behavior and
the taks is not always replaced.

* Include number of non conforming tasks in the exception.

* No longer replace test task, create implicit instead

Closes #31324. The issue has full context in comments.

With this change the `test` task becomes nothing more than an alias for `utest`.
Some of the stand alone tests that had a `test` task now have `integTest`, and a
few of them that used to have `integTest` to run multiple tests now only
have `check`.
This will also help separarate unit/micro tests from integration tests.

* Revert "No longer replace test task, create implicit instead"

This reverts commit f1ebaf7d93e4a0a19e751109bf620477dc35023c.

* Fix replacement of the test task

Based on information from gradle/gradle#5730 replace the task taking
into account the task providres.
Closes #31324.

* Only apply build comapare plugin if needed

* Make sure test runs before integTest

* Fix doclint aftter merge

* PR review comments

* Switch to Gradle 4.8.1 and remove workaround

* PR review comments

* Consolidate task ordering
2018-06-28 08:13:21 +03:00
Nik Everett 232c71b6bf
QA: Create xpack yaml features (#31403)
This creates a YAML test "features" that indices if the cluster being
tested has xpack installed (`xpack`) or if it does *not* have xpack
installed (`no_xpack`). It uses those features to centralize skipping
a few tests that fail if xpack is installed.

The plan is to use this in a followup to skip docs tests that require
xpack when xpack is not installed. We *plan* to use the declaration
of required license level on the docs page to generate the required
`skip`.

Closes #30933.
2018-06-26 09:26:48 -04:00
Christoph Büscher 86ab3a2d1a
Reduce number of raw types warnings (#31523)
A first attempt to reduce the number of raw type warnings, 
most of the time by using the unbounded wildcard.
2018-06-25 15:59:03 +02:00
Ryan Ernst 7a150ec06d
Core: Combine doExecute methods in TransportAction (#31517)
TransportAction currently contains 2 doExecute methods, one which takes
a the task, and one that does not. The latter is what some subclasses
implement, while the first one just calls the latter, dropping the given
task. This commit combines these methods, in favor of just always
assuming a task is present.
2018-06-22 15:03:01 -07:00
Dimitris Athanasiou c6cbc99f9c
[ML] Add ML filter update API (#31437)
This adds an api to allow updating a filter:

POST _xpack/ml/filters/{filter_id}/_update

The request body may have:

- description: setting a new description
- add_items: a list of the items to add
- remove_items: a list of the items to remove

This commit also changes the PUT filter api to
error when the filter_id is already used. As
now there is an api for updating filters, the
put api should only be used to create new ones.

Also, updating a filter results into a notification
message auditing the change for every job that is
using that filter.
2018-06-22 15:13:31 +01:00
Yogesh Gaikwad 724438a0b0
[Security] Check auth scheme case insensitively (#31490)
According to RFC 7617, the Basic authentication scheme name
should not be case sensitive.
Case insensitive comparisons are also applicable for the bearer
tokens where Bearer authentication scheme is used as per
RFC 6750 and RFC 7235

Some Http clients may send authentication scheme names in
different case types for eg. Basic, basic, BASIC, BEARER etc.,
so the lack of case-insensitive check is an issue when these
clients try to authenticate with elasticsearch.

This commit adds case-insensitive checks for Basic and Bearer
authentication schemes.

Closes #31486
2018-06-22 10:15:38 +10:00
Ryan Ernst 4f9332ee16
Core: Remove ThreadPool from base TransportAction (#31492)
Most transport actions don't need the node ThreadPool. This commit
removes the ThreadPool as a super constructor parameter for
TransportAction. The actions that do need the thread pool then have a
member added to keep it from their own constructor.
2018-06-21 11:25:26 -07:00
Ryan Ernst 00283a61e1
Remove unused generic type for client execute method (#31444)
This commit removes the request builder generic type for AbstractClient
as it was unused.
2018-06-20 16:26:26 -07:00
Tim Brooks 9ab1325953
Introduce http and tcp server channels (#31446)
Historically in TcpTransport server channels were represented by the
same channel interface as socket channels. This was necessary as
TcpTransport was parameterized by the channel type. This commit
introduces TcpServerChannel and HttpServerChannel classes. Additionally,
it adds the implementations for the various transports. This allows
server channels to have unique functionality and not implement the
methods they do not support (such as send and getRemoteAddress).

Additionally, with the introduction of HttpServerChannel this commit
extracts some of the storing and closing channel work to the abstract
http server transport.
2018-06-20 16:34:56 -06:00
Ryan Ernst 401800d958
Core: Remove index name resolver from base TransportAction (#31002)
Most transport actions don't need to resolve index names. This commit
removes the index name resolver as a super constructor parameter for
TransportAction. The actions that do need the resolver then have a
member added to keep the resolver from their own constructor.
2018-06-19 17:06:09 -07:00
Jay Modi dc57eece75
Security: fix joining cluster with production license (#31341)
The changes made to disable security for trial licenses unless security
is explicitly enabled caused issues when a 6.3 node attempts to join a
cluster that already has a production license installed. The new node
starts off with a trial license and `xpack.security.enabled` is not
set for the node, which causes the security code to skip attaching the
user to the request. The existing cluster has security enabled and the
lack of a user attached to the requests causes the request to be
rejected.

This commit changes the security code to check if the state has been
recovered yet when making the decision on whether or not to attach a
user. If the state has not yet been recovered, the code will attach
the user to the request in case security is enabled on the cluster
being joined.

Closes #31332
2018-06-19 11:58:34 -06:00
Tim Brooks 529e704b11
Unify http channels and exception handling (#31379)
This is a general cleanup of channels and exception handling in http.
This commit introduces a CloseableChannel that is a superclass of
TcpChannel and HttpChannel. This allows us to unify the closing logic
between tcp and http transports. Additionally, the normal http channels
are extracted to the abstract server transport.

Finally, this commit (mostly) unifies the exception handling between nio
and netty4 http server transports.
2018-06-19 11:50:03 -06:00
Ryan Ernst e67aa96c81
Core: Combine Action and GenericAction (#31405)
Since #30966, Action no longer has anything but a call to the
GenericAction super constructor. This commit renames GenericAction
into Action, thus eliminating the Action class. Additionally, this
commit removes the Request generic parameter of the class, since
it was unused.
2018-06-18 23:53:04 +02:00
Yannick Welsch 02a4ef38a7
Use system context for cluster state update tasks (#31241)
This commit makes it so that cluster state update tasks always run under the system context, only
restoring the original context when the listener that was provided with the task is called. A notable
exception is the clusterStatePublished(...) callback which will still run under system context,
because it's defined on the executor-level, and not the task level, and only called once for the
combined batch of tasks and can therefore not be uniquely identified with a task / thread context.

Relates #30603
2018-06-18 16:46:04 +02:00
Dimitris Athanasiou c6a5a6d924
[ML] Put ML filter API response should contain the filter (#31362) 2018-06-15 21:15:35 +01:00
Tim Brooks a705e1a9e3
Add byte array pooling to nio http transport (#31349)
This is related to #28898. This PR implements pooling of bytes arrays
when reading from the wire in the http server transport. In order to do
this, we must integrate with netty reference counting. That manner in
which this PR implements this is making Pages in InboundChannelBuffer
reference counted. When we accessing the underlying page to pass to
netty, we retain the page. When netty releases its bytebuf, it releases
the underlying pages we have passed to it.
2018-06-15 14:01:03 -06:00
Dimitris Athanasiou da5bfda5f3
[ML] Hold ML filter items in sorted set (#31338)
Filter items should be unique. They should also
be sorted to make them easier to read plus save
sorting in the autodetect process.
2018-06-15 16:29:09 +01:00
Tanguy Leroux 992c7889ee
Uncouple persistent task state and status (#31031)
This pull request removes the relationship between the state 
of persistent task (as stored in the cluster state) and the status 
of the task (as reported by the Task APIs and used in various 
places) that have been confusing for some time (#29608).

In order to do that, a new PersistentTaskState interface is added. 
This interface represents the persisted state of a persistent task. 
The methods used to update the state of persistent tasks are 
renamed: updatePersistentStatus() becomes updatePersistentTaskState() 
and now takes a PersistentTaskState as a parameter. The 
Task.Status type as been changed to PersistentTaskState in all 
places were it make sense (in persistent task customs in cluster 
state and all other methods that deal with the state of an allocated 
persistent task).
2018-06-15 09:26:47 +02:00
Tim Brooks fcf1e41e42
Extract common http logic to server (#31311)
This is related to #28898. With the addition of the http nio transport,
we now have two different modules that provide http transports.
Currently most of the http logic lives at the module level. However,
some of this logic can live in server. In particular, some of the
setting of headers, cors, and pipelining. This commit begins this moving
in that direction by introducing lower level abstraction (HttpChannel,
HttpRequest, and HttpResonse) that is implemented by the modules. The
higher level rest request and rest channel work can live entirely in
server.
2018-06-14 15:10:02 -06:00
Dimitris Athanasiou 9b293275af
[ML] Add description to ML filters (#31330)
This adds a `description` to ML filters in order
to allow users to describe their filters in a human
readable form which is also editable (filter updates
to be added shortly).
2018-06-14 16:52:32 +01:00
Tanguy Leroux 2d4c9ce08c Remove remaining unused imports before merging #31270 2018-06-14 09:52:03 +02:00
Tal Levy bbb7889236
move security ingest processors to a sub ingest directory (#31306)
It makes sense to introduce new Security ingest
processors (example: #31087), and this change would
give them a good place to be written.
2018-06-13 13:35:41 -07:00
Zachary Tong a486177a19
[Rollup] Metric config parser must use builder so validation runs (#31159)
The parser for the Metric config was directly instantiating
the config object, rather than using the builder.  That means it was
bypassing the validation logic built into the builder, and would allow
users to create invalid metric configs (like using unsupported metrics).

The job would later blow up and abort due to bad configs, but this isn't
immediately obvious to the user since the PutJob API succeeded.
2018-06-13 11:31:04 -04:00
David Kyle 88f44a9f66
[ML] Check licence when datafeeds use cross cluster search (#31247)
This change prevents a datafeed using cross cluster search from starting if the remote cluster
does not have x-pack installed and a sufficient license. The check is made only when starting a 
datafeed.
2018-06-13 15:42:18 +01:00
Dimitris Athanasiou 5c77ebe89d
[ML] Implement new rules design (#31110)
Rules allow users to supply a detector with domain
knowledge that can improve the quality of the results.
The model detects statistically anomalous results but it
has no knowledge of the meaning of the values being modelled.

For example, a detector that performs a population analysis
over IP addresses could benefit from a list of IP addresses
that the user knows to be safe. Then anomalous results for
those IP addresses will not be created and will not affect
the quantiles either.

Another example would be a detector looking for anomalies
in the median value of CPU utilization. A user might want
to inform the detector that any results where the actual
value is less than 5 is not interesting.

This commit introduces a `custom_rules` field to the `Detector`.
A detector may have multiple rules which are combined with `or`.

A rule has 3 fields: `actions`, `scope` and `conditions`.

Actions is a list of what should happen when the rule applies.
The current options include `skip_result` and `skip_model_update`.
The default value for `actions` is the `skip_result` action.

Scope is optional and allows for applying filters on any of the
partition/over/by field. When not defined the rule applies to
all series. The `filter_id` needs to be specified to match the id
of the filter to be used. Optionally, the `filter_type` can be specified
as either `include` (default) or `exclude`. When set to `include`
the rule applies to entities that are in the filter. When set to
`exclude` the rule only applies to entities not in the filter.

There may be zero or more conditions. A condition requires `applies_to`,
`operator` and `value` to be specified. The `applies_to` value can be
either `actual`, `typical` or `diff_from_typical` and it specifies
the numerical value to which the condition applies. The `operator`
(`lt`, `lte`, `gt`, `gte`) and `value` complete the definition.
Conditions are combined with `and` and allow to specify numerical
conditions for when a rule applies.

A rule must either have a scope or one or more conditions. Finally,
a rule with scope and conditions applies when all of them apply.
2018-06-13 11:20:38 +01:00
Jason Tedor 0bfd18cc8b
Revert upgrade to Netty 4.1.25.Final (#31282)
This reverts upgrading to Netty 4.1.25.Final until we have a cleaner
solution to dealing with the object cleaner thread.
2018-06-12 19:26:18 -04:00
Jason Tedor 666997830e
Fix naming conventions check for XPackTestCase
This class needs to be abstract or it fails the naming convention check.
2018-06-12 11:34:40 -04:00
Jason Tedor f738b7d9f8
Fix security Netty 4 transport tests
This test suite needs to filter out the object cleaner thread too so
this commit does that.
2018-06-12 11:31:43 -04:00
Ioannis Kakavas b2e48c9fa7
Support RequestedAuthnContext (#31238)
* Support RequestedAuthnContext

This implements limited support for RequestedAuthnContext by :
- Allowing SP administrators to define a list of authnContextClassRef
to be included in the RequestedAuthnContext of a SAML Authn Request
- Veirifying that the authnContext in the incoming SAML Asertion's
AuthnStatement contains one of the requested authnContextClassRef
- Only EXACT comparison is supported as the semantics of validating
the incoming authnContextClassRef are deployment dependant and
require pre-established rules for MINIMUM, MAXIMUM and BETTER

Also adds necessary AuthnStatement validation as indicated by [1] and
[2]

[1] https://docs.oasis-open.org/security/saml/v2.0/saml-core-2.0-os.pdf
    3.4.1.4, line 2250-2253
[2] https://kantarainitiative.github.io/SAMLprofiles/saml2int.html
    [SDP-IDP10]
2018-06-12 12:23:40 +03:00
Aditya Dhulipala 72f8199279 Validate xContentType in PutWatchRequest. (#31088)
Trying to post a new watch without any body currently results in a 
NullPointerException. This change fixes that by validating that 
Post and Put requests always have a body.

Closes #30057
2018-06-12 09:53:36 +02:00
Jason Tedor 563141c6c9
Upgrade to Netty 4.1.25.Final (#31232)
This commit upgrades us to Netty 4.1.25. This upgrade is more
challenging than past upgrades, all because of a new object cleaner
thread that they have added. This thread requires an additional security
permission (set context class loader, needed to avoid leaks in certain
scenarios). Additionally, there is not a clean way to shutdown this
thread which means that the thread can fail thread leak control during
tests. As such, we have to filter this thread from thread leak control.
2018-06-11 16:55:07 -04:00
Tanguy Leroux bf58660482
Remove all unused imports and fix CRLF (#31207)
The X-Pack opening and the recent other refactorings left a lot of 
unused imports in the codebase. This commit removes them all.
2018-06-11 15:12:12 +02:00
Julie Tibshirani 00b0e10063
Remove DocumentFieldMappers#simpleMatchToFullName. (#31041)
* Remove DocumentFieldMappers#simpleMatchToFullName, as it is duplicative of MapperService#simpleMatchToIndexNames.
* Rename MapperService#simpleMatchToIndexNames -> simpleMatchToFullName for consistency.
* Simplify EsIntegTestCase#assertConcreteMappingsOnAll to accept concrete fields instead of wildcard patterns.
2018-06-08 13:53:35 -07:00
Jay Modi 8aa58887e2
Security: make native realm usage stats accurate (#30824)
The native realm's usage stats were previously pulled from the cache,
which only contains the number of users that had authenticated in the
past 20 minutes. This commit changes this so that we pull the current
value from the security index by executing a search request. In order
to support this, the usage stats for realms is now asynchronous so that
we do not block while waiting on the search to complete.
2018-06-06 08:18:56 -06:00
Zachary Tong a1c9def64e
[Rollup] Disallow index patterns that match the rollup index (#30491)
We should not allow the user to configure index patterns that also match
the index which stores the rollup index.

For example, it is quite natural for a user to specify `metricbeat-*`
as the index pattern, and then store the rollups in `metricbeat-rolled`.
This will start throwing errors as soon as the rollup index is created
because the indexer will try to search it.

Note: this does not prevent the user from matching against existing
rollup indices.  That should be prevented by the field-level validation
during job creation.
2018-06-05 15:00:34 -04:00
Yannick Welsch 3b98c26d03
Only auto-update license signature if all nodes ready (#30859)
Allows rolling restart from 6.3 to 6.4.

Relates to #30731 and #30251
2018-06-05 13:43:04 +02:00
Christoph Büscher 3f87c79500
Change ObjectParser exception (#31030)
ObjectParser should throw XContentParseExceptions, not IAE. A dedicated parsing
exception can includes the place where the error occurred.

Closes #30605
2018-06-04 20:20:37 +02:00
Zachary Tong b422978c0c
[Rollup] Specialize validation exception for easier management (#30339)
Extends ActionRequestValidationException with a rollup-specific version
to make it easier to handle mapping validation issues on the client
side.

The type will now be `rollup_action_request_validation_exception`
instead of `action_request_validation_exception`
2018-06-04 10:28:36 -04:00
Christoph Büscher 11b11f6f4c
Share common readFrom/writeTo code in AcknowledgeResponse (#30983)
The majority of Responses inheriting from AcknowledgeResponse implement
the readFrom and writeTo serialization method in the same way. Moving this
as a default into AcknowledgeResponse and letting the few exceptions that
need a slightly different implementation handle this themselves saves a lot
of duplication.
2018-06-04 15:10:02 +02:00
Boaz Leskes a7ceefe93f
Make Persistent Tasks implementations version and feature aware (#31045)
With #31020 we introduced the ability for transport clients to indicate what features they support
in order to make sure we don't serialize object to them they don't support. This PR adapts the
serialization logic of persistent tasks to be aware of those features and not serialize tasks that
aren't supported. 

Also, a version check is added for the future where we may add new tasks implementations and
need to be able to indicate they shouldn't be serialized both to nodes and clients.

As the implementation relies on the interface of `PersistentTaskParams`, these are no longer
optional. That's acceptable as all current implementation have them and we plan to make
`PersistentTaskParams` more central in the future.

Relates to #30731
2018-06-03 21:51:08 +02:00