They rely on finalizers (before Java 11), which create
unnecessary GC load. The alternatives are as easy to
use and don't have this issue.
Also use FileChannel directly instead of retrieving
it from RandomAccessFile whenever possible
since the indirection is unnecessary.
Finally, add a few try/finally blocks.
Reviewers: Colin Patrick McCabe <colin@cmccabe.xyz>, Rajini Sivaram <rajinisivaram@googlemail.com>
Enforce window retention times strictly:
* records for windows that are expired get dropped
* queries for timestamps old enough to be expired immediately answered with null
Reviewers: Bill Bejeck <bill@confluent.io>, Damian Guy <damian@confluent.io>, Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <wangguoz@gmail.com>
Significant refactor of Segments to use stream-time as the basis of segment expiration.
Previously Segments assumed that the current record time was representative of stream time.
In the event of a "future" event (one whose record time is greater than the stream time), this
would inappropriately drop live segments. Now, Segments will provision the new segment
to house the future event and drop old segments only after they expire.
Reviewers: Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <wangguoz@gmail.com>
- Removed Scala consumers (`SimpleConsumer` and `ZooKeeperConsumerConnector`)
and their tests.
- Removed Scala request/response/message classes.
- Removed any mention of new consumer or new producer in the code
with the exception of MirrorMaker where the new.consumer option was
never deprecated so we have to keep it for now. The non-code
documentation has not been updated either, that will be done
separately.
- Removed a number of tools that only made sense in the context
of the Scala consumers (see upgrade notes).
- Updated some tools that worked with both Scala and Java consumers
so that they only support the latter (see upgrade notes).
- Removed `BaseConsumer` and related classes apart from `BaseRecord`
which is used in `MirrorMakerMessageHandler`. The latter is a pluggable
interface so effectively public API.
- Removed `ZkUtils` methods that were only used by the old consumers.
- Removed `ZkUtils.registerBroker` and `ZKCheckedEphemeral` since
the broker now uses the methods in `KafkaZkClient` and no-one else
should be using that method.
- Updated system tests so that they don't use the Scala consumers except
for multi-version tests.
- Updated LogDirFailureTest so that the consumer offsets topic would
continue to be available after all the failures. This was necessary for it
to work with the Java consumer.
- Some multi-version system tests had not been updated to include
recently released Kafka versions, fixed it.
- Updated findBugs and checkstyle configs not to refer to deleted
classes and packages.
Reviewers: Dong Lin <lindong28@gmail.com>, Manikumar Reddy <manikumar.reddy@gmail.com>
This version is a WIP and intentionally leaves out some additional required changes to keep the reviewing effort more manageable. This version of the process includes
1. Cleaning up the graph objects to reduce the number of parameters and make the naming conventions more clear.
2. Intercepting all calls to the InternalToplogyBuilder and capturing all details required for possible optimizations and building the final topology.
This PR does not include writing out the current physical plan, so no tests included. The next PR will include additional changes to building the graph and writing the topology out without optimizations, using the current streams tests.
Reviewers: John Roesler <john@confluent.io>, Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <wangguoz@gmail.com>
The old timeout configs no longer take effect, as of
53ca52f855e903907378188d29224b3f9cefa6cb. They are replaced
by the new one.
Reviewers: Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <wangguoz@gmail.com>
Reviewers: Matthias J. Sax <matthias@confluent.io>, Bill Bejeck <bill@confluent.io>, Guozhang Wang <guozhang@confluent.io>, Ted Yu <yuzhihong@gmail.com>
* KAFKA-6474: Rewrite tests to use new public TopologyTestDriver [part 2]
* Refactor:
-KTableFilterTest.java
-KTableImplTest.java
-KTableMapValuesTest.java
-KTableSourceTest.java
* Add access to task, processorTopology, and globalTopology in TopologyTestDriver via TopologyTestDriverWrapper
* Remove unnecessary constructor in TopologyTestDriver
* Change how TopologyTestDriverWrapper#getProcessorContext sets the current node
Reviewers: John Roesler <john@confluent.io>, Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <wangguoz@gmail.com>
Add a unit test that validates after restoreStart, the options are set with bulk loading configs; and after restoreEnd, it resumes to the customized configs
Reviewers: Matthias J. Sax <matthias@confluent.io>
This PR actually contains two changes:
1. leverage on the TOPOLOGY_OPTIMIZATION config to "adjust" the topology internally to reuse the source topic.
2. fixed a long dangling bug that whenever source topic is reused as changelog topic, write the checkpoint file for the consumed offset, this is done by union the ackedOffset from the producer, plus the consumed offset from the consumer, note we will priori ackedOffset since the same topic may show up in both (think about repartition topic), by doing this the consumed offset from source topics can be treated as checkpointed offset when reuse happens.
3. added a few unit and integration tests with / wo the reusing, and make sure the restoration, standby task, and internal topic creation behaviors are all correct.
Reviewers: John Roesler <john@confluent.io>, Bill Bejeck <bill@confluent.io>, Matthias J. Sax <matthias@confluent.io>
*Summary
options.prepareForBulkLoad() and then use the configs from the customized customized RocksDBConfigSetter. This may overwrite the configs set in prepareBulkLoad call. The fix is to move prepareBulkLoad call after applying configs customized RocksDBConfigSetter.
Reviewers: Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <guozhang@confluent.io>, Bill Bejeck <bill@confluent.io>
Make use of the new Consumer#poll(Duration) to avoid getting stuck in poll when the broker is unavailable.
Reviewers: Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <guozhang@confluent.io>, Bill Bejeck <bill@confluent.io>
Adding configuration to StreamsConfig allowing for making topology optimization optional.
Added unit tests are verifying default values, setting correct value and failure on invalid values.
Reviewers: John Roesler <john@confluent.io>, Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <wangguoz@gmail.com>
* KAFKA-6993: Fix defective documentations for KStream/KTable methods
1. Fix the documentation of following methods, e.g., making more detailed description for the overloaded methods:
- KStream#join
- KStream#leftJoin
- KStream#outerJoin
- KTable#filter
- KTable#filterNot
- KTable#mapValues
- KTable#transformValues
- KTable#join
- KTable#leftJoin
- KTable#outerJoin
2. (trivial) with possible new type -> with possibly new type.
Reviewers: Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <guozhang@confluent.io>, Bill Bejeck <bill@confluent.io>
While using an iterator from IQ, it's possible to get an InvalidStateStoreException if the StreamThread closes the store during a range query.
Added a unit test to SegmentIteratorTest for this condition.
Reviewers: John Roesler <john@confluent.io>, Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <wangguoz@gmail.com>
#4919 unintentionally changed the topology naming scheme. This change returns to the prior scheme.
Reviewers: Bill Bejeck <bill@confluent.io>, Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <wangguoz@gmail.com>
Changes to keep the operation name as is and make the sensor name unique.
Reviewers: John Roesler <john@confluent.io>, Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <wangguoz@gmail.com>
In #4919 we propagate the SerDes for each of these aggregation operators.
As @guozhangwang mentioned in that PR:
```
reduce: inherit the key and value serdes from the parent XXImpl class.
count: inherit the key serdes, enforce setting the Serdes.Long() for value serdes.
aggregate: inherit the key serdes, do not set for value serdes internally.
```
Although it's all good for reduce and count, it is quiet unsafe to have aggregate without Materialized given. In fact I don't see why we would not give a Materialized for the aggregate since the result type will always be different (otherwise use reduce) and also the value Serde is simply not propagated.
This has been discussed previously in a broader PR before but I believe for aggregate we could pass implicitly a Materialized the same way we pass a Joined, just to avoid the stupid case. Then if the user wants to specialize, he can give his own Materialized.
Reviewers: Debasish Ghosh <dghosh@acm.org>, Guozhang Wang <guozhang@confluent.io>
Currently, the AbstractStream class defines a copy-constructor that allow to extend KStream and KTable APIs with new methods without impacting the public interface.
However adding new processor or/and store to the topology is made throught the internalTopologyBuilder that is not accessible from AbstractStream subclasses defined outside of the package (package visibility).
Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <guozhang@confluent.io>
Add the new stricter-timeout version of `poll` proposed in KIP-266.
The pre-existing variant `poll(long timeout)` would block indefinitely for metadata
updates if they were needed, then it would issue a fetch and poll for `timeout` ms
for new records. The initial indefinite metadata block caused applications to become
stuck when the brokers became unavailable. The existence of the timeout parameter
made the indefinite block especially unintuitive.
This PR adds `poll(Duration timeout)` with the semantics:
1. iff a metadata update is needed:
1. send (asynchronous) metadata requests
2. poll for metadata responses (counts against timeout)
- if no response within timeout, **return an empty collection immediately**
2. if there is fetch data available, **return it immediately**
3. if there is no fetch request in flight, send fetch requests
4. poll for fetch responses (counts against timeout)
- if no response within timeout, **return an empty collection** (leaving async fetch request for the next poll)
- if we get a response, **return the response**
The old method, `poll(long timeout)` is deprecated, but we do not change its semantics, so it remains:
1. iff a metadata update is needed:
1. send (asynchronous) metadata requests
2. poll for metadata responses *indefinitely until we get it*
2. if there is fetch data available, **return it immediately**
3. if there is no fetch request in flight, send fetch requests
4. poll for fetch responses (counts against timeout)
- if no response within timeout, **return an empty collection** (leaving async fetch request for the next poll)
- if we get a response, **return the response**
One notable usage is prohibited by the new `poll`: previously, you could call `poll(0)` to block for metadata updates, for example to initialize the client, supposedly without fetching records. Note, though, that this behavior is not according to any contract, and there is no guarantee that `poll(0)` won't return records the first time it's called. Therefore, it has always been unsafe to ignore the response.
* Removed Scala producers, request classes, kafka.tools.ProducerPerformance, encoders,
tests.
* Updated ConsoleProducer to remove Scala producer support (removed `BaseProducer`
and several options that are not used by the Java producer).
* Updated a few Scala consumer tests to use the new producer (including a minor
refactor of `produceMessages` methods in `TestUtils`).
* Updated `ClientUtils.fetchTopicMetadata` to use `SimpleConsumer` instead of
`SyncProducer`.
* Removed `TestKafkaAppender` as it looks useless and it defined an `Encoder`.
* Minor import clean-ups
No new tests added since behaviour should remain the same after these changes.
Author: Ismael Juma <ismael@juma.me.uk>
Reviewers: Manikumar Reddy O <manikumar.reddy@gmail.com>, Dong Lin <lindong28@gmail.com>
Closes#5045 from ijuma/kafka-6921-remove-old-producer
test_broker_type_bounce_at_start tries to validate that when the controller is down, the streams client will always fail trying to create the topic; with the current behavior of admin client it is actually not always true: the actual behavior depends on the admin client internals as well as when the controller becomes unavailable during the leader assign partitions phase. I'd suggest at least ignore this test for now until the admin client has more stable (personally I'd even suggest removing this test as its coverage benefits is smaller than its introduced issues to me).
Also adding a few more log4j entries as a result of investigating this issue.
Reviewers: Matthias J. Sax <matthias@confluent.io>
The type inference doesn't currently work for the join functions in Scala as it doesn't know yet the types of the given KStream[K, V] or KTable[K, V].
The fix here is to curry the joiner function. I personally prefer this notation but this also means it differs more from the Java API.
I believe the diff with the Java API is worth in this case as it's not only solving the type inference but also fits better the Scala way of coding (ex: fold).
Moreover any Scala dev will bug and spend little time on these functions trying to understand why the type inference is not working and then get frustrated to be obliged to be explicit here where it's not harmful to be inferred.
Reviewers: Debasish Ghosh <dghosh@acm.org>, Guozhang Wang <guozhang@confluent.io>, Ismael Juma <ismael@juma.me.uk>
This is a follow-up to #5022 which added documentation to the Processor
interface. This commit adds similar documentation to Transformer and
ValueTransformer.
Also, s/processor/transformer/ in the close() docs.
Reviewers: Matthias J. Sax <matthias@confluent.io>, Guozhang Wang <wangguoz@gmail.com>
Ismael Juma
xinzhg
John Roesler
Guozhang Wang
Stephane Maarek
Bill Bejeck
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Matthias J. Sax
Jagadesh Adireddi
Filipe Agapito
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Liquan Pei
Lee Dongjin
Rajini Sivaram
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Vahid Hashemian
emmanuel Harel
Joan Goyeau
Florian Hussonnois
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