Table of Contents

Status

Current state: Under Discussion Accepted(vote)

Discussion thread: here

JIRA:

Jira

server	ASF JIRA
columns	key,summary,type,created,updated,due,assignee,reporter,priority,status,resolution
serverId	5aa69414-a9e9-3523-82ec-879b028fb15b
key	KAFKA-5876

...

Motivation

Currently, IQ throws InvalidStateStoreException for any types of error, that means a user cannot handle different types of error.

Because of that, we should throw different exceptions for each type.

Proposed Changes

The To distinguish different types of error, we need to handle all InvalidStateStoreException better during these public methods invoked. The main change is to introduce new exceptions that extend from InvalidStateStoreException. InvalidStateStoreException is not thrown at all anymore, but only new sub-classes.

Code Block

language	java

# Throw to user exception
public class StateStoreMigratedExceptionStreamsNotStartedException extends InvalidStateStoreException
public class StateStoreRetryableExceptionStreamsRebalancingException extends InvalidStateStoreException
public class StateStoreFailExceptionStateStoreMigratedException extends InvalidStateStoreException

 
# Internal exception
public class StateStoreClosedExceptionStateStoreNotAvailableException extends InvalidStateStoreException
public class StateStoreEmptyExceptionUnknownStateStoreException extends InvalidStateStoreException
public class StreamThreadNotRunningExceptionInvalidStateStorePartitionException extends InvalidStateStoreException

Three categories exception throw to the user:

StreamsNotStartedException: will be thrown when stream thread state is CREATED, the user can retry until to RUNNING.
StreamsRebalancingException: will be thrown when stream thread is not running and stream state is REBALANCINGStateStoreRetryableException: The application instance in the state of rebalancing, the user just need retry and wait until rebalance finished (RUNNING).
StateStoreMigratedException: The store got migrated and not hosted in application instance, the users need to rediscover the store.
StateStoreFailException: Fatal error when access state store, the user cannot retry or rediscover.

Three internal exceptions: StateStoreClosedException, StateStoreEmptyException, StreamThreadNotRunningException

The purpose of the internal exceptions is to distinguish between the different kinds of InvalidStateStoreException. The internal exception will be wrapped as user's category exception finally.

For example, StreamThreadStateStoreProvider#stores() will throw StreamThreadNotRunningException(internal exception). And then the internal exception will be wrapped as StateStoreRetryableException or StateStoreFailException during the KafkaStreams.store() and throw to the user.

will be thrown when state store already closed and stream state is RUNNING. The user need to rediscover the store and cannot blindly retry as the store handle is invalid and a new store handle must be retrived.
StateStoreNotAvailableException: will be thrown when state store closed and stream state is PENDING_SHUTDOWN / NOT_RUNNING / ERROR. The user cannot retry when this exception is thrown.
UnknownStateStoreException: will be thrown when passing an unknown state store. The user cannot retry when this exception is thrown.
InvalidStateStorePartitionException: will be thrown when user requested partition is not available on the stream instance.

...

The following is the public method methods that users will call to get state store instance:

KafkaStreams
- @Deprecated store()
ReadOnlyKeyValueStore(CompositeReadOnlyKeyValueStore)
- get(k)
- range(from, to)
- all()
- approximateNumEntries()
ReadOnlySessionStore(CompositeReadOnlySessionStore)
- fetch(k)
- fetch(from, to)
ReadOnlyWindowStore(CompositeReadOnlyWindowStore)
- fetch(k, rf, tt)
- fetch(from, to, rf, tt)
- all()
- fetchAll()
KeyValueIterator(DelegatingPeekingKeyValueIterator)
- next()
- hasNext()
- peekNextKey()
WindowStoreIterator(MeteredWindowStoreIterator)
- next()
- hasNext()
- peekNextKey()

Code Block

language	java

public class KafkaStreams {
    public <T> T store(final String storeName, final QueryableStoreType<T> queryableStoreType);
}
 
public class CompositeReadOnlyKeyValueStore<K, V> implements ReadOnlyKeyValueStore<K, V> {
    public V get(final K key);
    public KeyValueIterator<K, V> range(final K from, final K to);
    public KeyValueIterator<K, V> all();
    public long approximateNumEntries();
}
 
public class CompositeReadOnlySessionStore<K, V> implements ReadOnlySessionStore<K, V> {
    public KeyValueIterator<Windowed<K>, V> fetch(final K key);
    public KeyValueIterator<Windowed<K>, V> fetch(final K from, final K to);
}
 
public class CompositeReadOnlyWindowStore<K, V> implements ReadOnlyWindowStore<K, V> {
    public WindowStoreIterator<V> fetch(final K key, final long timeFrom, final long timeTo);
    public KeyValueIterator<Windowed<K>, V> fetch(final K from, final K to, final long timeFrom, final long timeTo);
    public KeyValueIterator<Windowed<K>, V> all();
    public KeyValueIterator<Windowed<K>, V> fetchAll(final long timeFrom, final long timeTo);
}
 
class DelegatingPeekingKeyValueIterator<K, V> implements KeyValueIterator<K, V>, PeekingKeyValueIterator<K, V> {
    public synchronized boolean hasNext();
    public synchronized KeyValue<K, V> next();
    public KeyValue<K, V> peekNext();
}

class MeteredWindowStoreIterator<V> implements WindowStoreIterator<V> {
    public boolean hasNext();
    public KeyValue<Long, V> next();
    public Long peekNextKey()
}

During user call one of above methods, we should check KafkaStreams state by the following rule when InvalidStateStoreException is thrown:

If state is RUNNING or REBALANCING:
- StateStoreClosedException: should be wrapped to StateStoreRetryableException
- StreamThreadNotRunningException: should be wrapped to StateStoreRetryableException
- StateStoreEmptyException: should be wrapped to StateStoreMigratedException
if state is PENDING_SHUTDOWN or ERROR or NOT_RUNNING:
- wrap InvalidStateStoreException(include sub classes) to StateStoreFailException

Call Trace

Expand

title	Call trace 1: KafkaStreams#store()

KafkaStreams#store() (v)
- QueryableStoreProvider#getStore() (v)
  - GlobalStateStoreProvider#stores() (v)
  - StreamThreadStateStroeProvider#stores() (v)

Expand

title	Call trace 2: ReadOnlyKeyValueStore#get()

CompositeReadOnlyKeyValueStore#get() (v)
- WrappingStoreProvider#stores() (v)
  - StreamThreadStateStoreProvider#stores() (v)
- MeteredKeyValueBytesStore#get()
  - InnerMeteredKeyValueStore#get()
    - CachingKeyValueStore#get()
      - AbstractStateStore#validateStoreOpen() (v)
        RocksDBStore#isOpen()
    - CachingKeyValueStore#getInternal()
      - ChangeLoggingKeyValueBytesStore#get()
        RocksDBStore#get()
        RocksDBStore#validateStoreOpen() (v)
        RocksDBStore#getInternal()

Expand

title	Call trace 3: ReadOnlyKeyValueStore#range()

CompositeReadOnlyKeyValueStore#range() (v)
- WrappingStoreProvider#stores() (v)
  - StreamThreadStateStoreProvider#stores() (v)
- return new DelegatingPeekingKeyValueIterator
DelegatingPeekingKeyValueIterator#hasNext() (v)
- CompositKeyValueIterator#hasNext()
  - NextIteratorFunction#apply() (v)
    - MeteredKeyValueBytesStore#range()
      - InnerMeteredKeyValueStore#range()
        CachingKeyValueStore#range()
        AbstractStateStore#validateStoreOpen() (v)
        ChangeLoggingKeyValueBytesStore#range()
        RocksDBStore#range()
        RocksDBStore#validateStoreOpen() (v)
        return new RocksDBRangeIterator()
        return new MergedSortedCacheKeyValueBytesStoreIterator()
        return new MeteredKeyValueIterator()
      - return
    - return
  - return
- CompositKeyValueIterator#next()
  - MeteredKeyValueIterator#next()
    - MergedSortedCacheKeyValueBytesStoreIterator#next()
      AbstractMergedSortedCacheStoreIterator#next()

- - - - RocksDBRangeIterator#hasNext()
        RocksDBIterator#hasNext() (v)
        RocksIterator#isValid()
      - AbstractMergedStortedCacheStoreIterator#nextSrtoreValue()
        RocksDBRangeIterator#next()
        RocksDBIterator#next()
        RocksDbIterator#hasNext() (v)
        RocksDbIterator#getKeyValue()
        RocksIterator#next()
        return keyvalue entry
        return
      - return
    - return outerkeyvalue
  - return
- return
DelegatingPeekingKeyValueIterator#next()
- return keyvalue

Expand

title	Call trace 4: ReadOnlyKeyValueStore#all()

CompositeReadOnlyKeyValueStore#all() (v)
- WrappingStoreProvider#stores() (v)
  - StreamThreadStateStoreProvider#stores() (v)
- return new DelegatingPeekingKeyValueIterator
DelegatingPeekingKeyValueIterator#hasNext() (v)
- CompositKeyValueIterator#hasNext()
  - NextIteratorFunction#apply() (v)
    - MeteredKeyValueBytesStore#all()
      - InnerMeteredKeyValueStore#all()
        CachingKeyValueStore#all()
        AbstractStateStore#validateStoreOpen() (v)
        ChangeLoggingKeyValueBytesStore#all()
        RocksDBStore#all()
        RocksDBStore#validateStoreOpen() (v)
        return new RocksDBIterator()
        return
        return new MergedSortedCacheKeyValueBytesStoreIterator()
        return new MeteredKeyValueIterator()
      - return
    - return
  - return
- CompositKeyValueIterator#next()
  - MeteredKeyValueIterator#next()
    - MergedSortedCacheKeyValueBytesStoreIterator#next()
      AbstractMergedSortedCacheStoreIterator#next()
      - MemoryLRUCacheBytesIterator.hasNext()
      - DelegatingPeekingKeyValueIterator.hasNext() (v)
      - AbstractMergedSortedCacheStoreIterator#nextStoreValue()
        DelegatingPeekingKeyValueIterator#next()
        DelegatingPeekingKeyValueIterator#hasNext() (v)
        return
      - return
    - return outerkeyvalue
  - return
- return
DelegatingPeekingKeyValueIterator#next()
- return keyvalue

Expand

title	Call trace 5: ReadOnlyKeyValueStore#approximateNumEntries()

CompositeReadOnlyKeyValueStore#approximateNumEntries() (v)
- WrappingStoreProvider#stores() (v)
  - StreamThreadStateStoreProvider#stores() (v)
- MeteredKeyValueBytesStore#approximateNumEntries()
  - InnerMeteredKeyValueStore#approximateNumEntries()
    - CachingKeyValueStore#approximateNumEntries()
      - AbstractStateStore#validateStoreOpen() (v)
        RocksDBStore#isOpen()
      - RocksDBStore#approximateNumEntries()
        RocksDBStore#validateStoreOpen() (v)
        return value
      - return
    - return
  - return
- return total

...

title	Call trace 6: ReadOnlySessionStore#fetch(key)

- storeName, queryableStoreType)
- store(storeQureyParams)

Info

All the above methods could be throw exceptions:

StreamsNotStartedException, StreamsRebalancingException, StateStoreMigratedException, StateStoreNotAvailableException, UnknownStateStoreException, InvalidStateStorePartitionException

The following is the public methods that users will call to get store values:

interface ReadOnlyKeyValueStore(class CompositeReadOnlyKeyValueStore)
- get(key)
- range(from, to)
- all()
- approximateNumEntries()
interface ReadOnlySessionStore(class CompositeReadOnlySessionStore)
- fetch(key)
- fetch(from, to)
interface ReadOnlyWindowStore(class CompositeReadOnlyWindowStore)
- fetch(key, time)
- fetch(key, from, to)
- fetch(from, to, fromTime, toTime)
- all()
- fetchAll(from, to)
- @Deprecated fetch(key, timeFrom, timeTo)
- @Deprecated fetch(from, to, timeFrom, timeTo)
- @Deprecated fetchAll(timeFrom, timeTo)
interface KeyValueIterator(class DelegatingPeekingKeyValueIterator)
- next()
- hasNext()
- peekNextKey()

Info

All the above methods could be throw following exceptions:

StreamsRebalancingException, StateStoreMigratedException, StateStoreNotAvailableException, InvalidStateStorePartitionException

CompositeReadOnlySessionStore#fetch(key) (v)
- WrappingStoreProvider#stores() (v)
  - StreamThreadStateStoreProvider#stores() (v)
- MeteredSessionStore#fetch(key)
  - MeteredSessionStore#findSessions()
    - CachingSessionStore#findSessions()
      - AbstractStateStore#validateStoreOpen() (v)
      - ChangeLoggingSessionBytesStore#findSessions()
        RocksDBSessionStore.findSessions(k)
        RocksDBSessionStore.findSessions(from, to)
        RocksDBSegmentedBytesStore#fetch()
        SessionKeySchema#segmentsToSearch()
        Segments#segments() (v)
        Segments#getSegment()
        ConcurrentHashMap#get()
        Segments#isSegment()
        return segment
        retiurn segments
        return
        return new SegmentIterator()
        return new WrappedSessionStoreIterator()
        return
        return
      - return new MergedSortedCacheSessionStoreIterator()
    - return new MeteredWindowedKeyValueIterator()
  - return
- MeteredWindowedKeyValueIterator#hasNext()
  - MergedSortedCacheSessionStoreIterator#hasNext()
    AbstraceMergedSortedCacheStoreIterator#hasNext()
    - FilteredCacheIterator#hasNext()
    - WrappedSessionStoreIterator#hasNext()
      - SegmentIterator#hasNext()
        Segment.range(from, to)
        RocksDBStore.range(from, to)
        RocksDBStore.validateStoreOpen() (v)
        return new RocksDBRangeIterator()
        return
      - return
    - return
  - return iterator(MeteredWindowedKeyValueIterator)
MeteredWindowedKeyValueIterator#next()
- MergedSortedCacheSessionStoreIterator#next()
  AbstractMergedSortedCacheStoreIterator#next()
  - AbstractMergedSortedCacheStoreIterator#hasNext()
  - FilteredCacheIterator#hasNext()
  - WrappedSessionStoreIterator#hasNext()
    - SegmentIterator#hasNext()
      - Segment.range(from, to)
        RocksDBStore.range(from, to)
        RocksDBStore.validateStoreOpen() (v)
        return new RocksDBRangeIterator()
      - return
    - return
  - MergedSortedCacheSessionStoreIterator#nextStoreValue()
    AbstractMergedSortedCacheStoreIterator#nextStoreValue()
    - WrappedSessionStoreIterator#next()
      - SegmentIterator#next()
        RocksDBRangeIterator#next()
        RocksDbIterator#next()
        RocksDbIterator#getKeyValue()
        RocksIterator#next()
        return entry
        return
      - return
    - return
  - return
- return

...

Expand

title	Call trace 7: ReadOnlySessionStore#fetch(from, to)

CompositeReadOnlySessionStore#fetch(from, to) (v)
- WrappingStoreProvider#stores() (v)
  - StreamThreadStateStoreProvider#stores() (v)
- return new DelegatingPeekingKeyValueIterator<>()
DelegatingPeekingKeyValueIterator#hasNext() (v)
- CompositKeyValueIterator#hasNext()
  - NextIteratorFunction#apply(store)
    - MeteredSessionStore#fetch(from, to)
      - MeteredSessionStore#findSession(from, to, 0, t)
        CachingSessionStore#findSession(from, to, 0, t)
        CachingSessionStore#validStoreOpen()
        AbstractStateStore#validStoreOpen() (v)
        ChangeLoggingSessionBytesStore#isOpen()
        RocksDBSessionStore#isOpen()
        AbstractStateStore#isOpen()
        RocksDBSegmentedBytesStore#isOpen()
        return
        return
        return
        ChangeLoggingSessionBytesStore#findSesisons()
        RocksDBSessionStore#findSessions()
        RocksDBSegmentedBytesStore#fetch()
        SessionKeySchema#segmentsToSearch()
        Segments#segments() (v)
        RocksDBStore#isOpen()
        return new SegmentIterator()
        return new WrappedSessionStoreIterator()
        return
        return
        return new MergedSortedCacheSessionStoreIterator()
        return MeteredWindowedKeyValueIterator()
      - return
    - return
  - MeteredWindowedKeyValueIterator#hasNext()
    - MergedSortedCacheSessionStoreIterator#hasNext()
      AbstractMergedSortedCacheStoreIterator#hasNext()
      - FilteredCacheIterator#hasNext()
      - WrappedSessionStoreIterator#hasNext()
        SegmentIterator#hasNext()
        Segment.range(from, to)
        RocksDBStore.range(from, to)

- - - - RocksDBStore.validateStoreOpen() (v)
        return new RocksDBRangeIterator()
        return
        return
      - return
    - return
  - return
- CompositeKeyValueIterator#next()
- return
DelegatingPeekingKeyValueIterator#next()
- return keyvalue

Expand

title	Call trace 8: ReadOnlyWindowStore#fetch(key)

CompositeReadOnlySessionStore#fetch(key) (v)
- WrappingStoreProvider#stores() (v)
  - StreamThreadStateStoreProvider#stores() (v)
- MeteredWindowStore#fetch()
  - CachingWindowStore#fetch(k, tf, tt)
    - AbstractStateStore#validateStoreOpen()
      - ChangeLoggingWindowBytesStore#isOpen()
        AbstractStateStore#isOpen()
        RocksDBWindowBytesStore#isOpen()
        RocksDBSegmentedBytesStore#isOpen()
        return
        return
        return
      - return
    - ChangeLoggingWindowBytesStore#fetch()
      - RocksDBWindowStoreBytesStore#fetch()
        RocksDBSegmentedBytesStore#fetch()
        WindowKeySchema#segmentsToSearch()
        Segments#segments()
        RocksDBStore#isOpen()
        return segments
        return
        return new SegmentIterator()
        WindowStoreIteratorWrapper.bytesIterator()
        return new WrappedWindowStoreBytesIterator()
        return
      - return
    - ThreadCache#range()
      - return new MemoryLRUCacheBytesIterator
    - return new MergedSortedCacheWindowStoreIterator
  - return new MeteredWindowStoreIterator
- MeteredWindowStoreIterator#hasNext()
  AbstractMergedSortedCacheStoreIterator#hasNext()
  - WrappedWindowStoreIterator#hasNext()
    - SegmentIterator#hasNext()
      - Segment#range()
        RocksDBStore#range()
        RocksDBStore#validateStoreOpen()
        return RocksDBRangeIterator
      - return
    - return
  - return
- return
MeteredWindowStoreIterator#hasNext()
- MeteredSortedCacheWindowStoreIterator#hasNext()
  AbstractMergedSortedCacheStoreIterator#hasNext()
  - WrappedWindowStoreIterator#hasNext()
    - SegmentIterator#hasNext()
      - Segment#range()
        RocksDBStore#range()
        RocksDBStore#validateStoreOpen() (v)
        return RocksDBRangeIterator
      - return
    - return
  - return
- return
MeteredWindowStoreIterator#next()
- MergedSortedCacheWindowStoreIterator#next()
  AbstractMergedSortedCacheStoreIterator#next()
  - WrappedWindowStoreBytesIterator#hasNext()
    - SegmentIterator#hasNext()
      - return
    - return
  - AbstractMergedSortedCacheStoreIterator#nextStoreValue()
    - WrappedWindowStoreBytesIterator#next()
      - SegmentIterator#next()
        SegmentIterator#hasNext()
        return
        RocksDBRangeIterator#next()
        RocksDBRangeIterator#hasNext()
        RocksDBIterator#hasNext() (v)
        return
        RocksIterator#next()
        return entry
        return
      - return keyvalue
    - return
  - return
- return keyvalue

Expand

title	Call trace 9: ReadOnlyWindowStore#fetch(from, to)

CompositeReadOnlyWindowStore#fetch(from, to)
- WrappingStoreProvider#stores() (v)
  - StreamThreadStateStoreProvider#stores() (v)
  - return
- return new DelegatingPeekingKeyValueIterator()
DelegatingPeekingKeyValueIterator#hasNext() (v)
- CompositeKeyValueIterator#hasNext()
  - NextIteratorFunciton#apply()
    - MeteredWindowStore#fetch()
      - CachingWindowStore#fetch()
        AbstractStateStore#validateStoreOpen() (v)
        ChangeLoggingWindowBytesStore#fetch()
        RocksDBWindowBytesStore#fetch()
        RocksDBSegmentedBytesStore#fetch()
        WindowKeySchema#segmentsToSearch()
        Segments#segments() (v)
        return
        return
        return SegmentIterator
        return keyvalueIterator
        return
        ThreadCache.range()
        return new MemoryLRUCacheBytesIterator
        WindowKeySchema#hasNextCondition()
        return new MergedSortedCacheWindowStoreKeyValueIterator()
      - return MeteredWindowKeyValueIterator()
    - return
  - MeteredWindowedKeyValueIterator#hasNext()
    - MergedSortedCacheWindowStoreKeyValueIterator#hasNext()
      AbstractMergedSortedCacheStoreIterator
      - WrappedWindowStoreBytesIterator#hasNext()
        WrappedKeyValueIterator#hasNext()
        SegementIterator#hasNext()
        Segment#range()
        RocksDBStore#range()
        RocksDBStore#validateStoreOpen() (v)
        return RocksDBRangeIterator
        return
      - return
    - return
  - return
- CompositeKeyValueIterator#next()
  - MeteredWindowedKeyValueIterator#next()
    - MergedSortedCacheWindowStoreKeyValueIterator#next()
      AbstractMergedSortedCacheStoreIterator#next()
      - AbstractMergedSortedCacheStoreIterator#hasNext()
      - AbstractMergedSortedCacheStoreIterator#nextStoreValue()
        WrappedWindowStoreBytesIterator#next()
        SegmentIteator#hasNext()
        SegmentIterator#next()
        SegmentIterator#hasNext() (v)
        RocksDBRangeIterator#next()
        RocksDbIterator#next()
        RocksDbIterator#hasNext()
        RocksIterator#next()
        return entry
        return
        return keyvalue
        return
      - return keyvalue
    - return
  - return
- return
DelegatingPeekingKeyValueIterator#next()
- DelegatingPeekingKeyValueIterator#hasNext()
- return

Expand

title	Call trace 10: ReadOnlyWindowStore#all()

CompositeReadOnlyWindowStore#all()
- WrappingStoreProvider#stores() (v)
  - StreamThreadStateStoreProvider#stores() (v)
  - return
- return new DelegatingPeekingKeyValueIterator()
DelegatingPeekingKeyValueIterator#hasNext() (v)
- CompositeKeyValueIterator#hasNext()
  - NextIteratorFunciton#apply()
    - MeteredWindowStore#all()
      - CachingWindowStore#all()
        AbstractStateStore#validateStoreOpen() (v)
        ChangeLoggingWindowBytesStore#all()
        RocksDBWindowBytesStore#all()
        RocksDBSegmentedBytesStore#all()
        Segments#allSegments() (v)
        return new SegmentIterator()
        return keyValueIterator
        return
        ThreadCache#all()
        return new MemoryLRUCacheBytesIterator
        return new MergedSortedCacheWindowStoreKeyValueIterator
      - return new MeteredWindowedKeyValueIterator()
    - return
  - MeteredWindowedKeyValueIterator#hasNext()
    - MergedSortedCacheWindowStoreKeyValueIterator#hasNext()
      AbstractMergedSortedCacheStoreIterator#hasNext()
      - WrappedKeyValueIterator#hasNext()
        SegmentIterator#hasNext() (v)
        return currentIterator
        return
      - return
    - return
  - return
- CompositeKeyValueIterator#next()
  - MeteredWindowedKeyValueIterator#next()
    - MergedSortedCacheWindowStoreKeyValueIterator#next()
      AbstractMergedSortedCacheStoreIterator#next()
      - WrappedKeyValueIterator#hasNext()
        SegmentIterator#hasNext()
      - AbstractMergedSortedCacheStoreIterator#nextStoreValue()
        WrappedKeyValueIterator#next()
        SegmentIterator#next()
        RocksDbIterator#next()
        RocksDbIterator#hasNext() (v)
        RocksIterator.next()
        return entry
        return
        return keyvalue
        return
      - return
    - return keyvalue
  - return
- return
DelegatingPeekingKeyValueIterator#next()
- DelegatingPeekingKeyValueIterator#hasNext()
- return

Expand

title	Call trace 11: ReadOnlyWindowStore#fetchAll()

CompositeReadOnlyWindowStore#fetchAll()
- WrappingStoreProvider#stores() (v)
  - StreamThreadStateStoreProvider#stores() (v)
  - return
- return new DelegatingPeekingKeyValueIterator()
DelegatingPeekingKeyValueIterator#hasNext() (v)
- CompositeKeyValueIterator#hasNext()
  - NextIteratorFunciton#apply()
    - MeteredWindowStore#fetchAll()
      - CachingWindowStore#fetchAll()
        AbstractStateStore#validateStoreOpen() (v)
        ChangeLoggingWindowBytesStore#fetchAll()
        RocksDBWindowBytesStore#fetchAll()
        RocksDBSegmentedBytesStore#fetchAll()
        Segments#allSegments() (v)
        return new SegmentIterator()
        return keyValueIterator
        return
        ThreadCache#all()
        return new MemoryLRUCacheBytesIterator
        return new MergedSortedCacheWindowStoreKeyValueIterator
      - return new MeteredWindowedKeyValueIterator()
    - return
  - MeteredWindowedKeyValueIterator#hasNext()
    - MergedSortedCacheWindowStoreKeyValueIterator#hasNext()
      AbstractMergedSortedCacheStoreIterator#hasNext()
      - WrappedKeyValueIterator#hasNext()
        SegmentIterator#hasNext() (v)
        return currentIterator
        return
      - return
    - return
  - return
- CompositeKeyValueIterator#next()
  - MeteredWindowedKeyValueIterator#next()
    - MergedSortedCacheWindowStoreKeyValueIterator#next()
      AbstractMergedSortedCacheStoreIterator#next()
      - WrappedKeyValueIterator#hasNext()
        SegmentIterator#hasNext() (v)
        return
      - AbstractMergedSortedCacheStoreIterator#nextStoreValue()
        WrappedKeyValueIterator#next()
        SegmentIterator#next()
        RocksDbIterator#next()
        RocksDbIterator#hasNext() (v)
        RocksIterator.next()
        return entry
        return
        return keyvalue
        return
      - return
    - return keyvalue
  - return
- return
DelegatingPeekingKeyValueIterator#next()
- DelegatingPeekingKeyValueIterator#hasNext()
- return

Compatibility, Deprecation, and Migration Plan

...

Rejected Alternatives

None.

Space shortcuts

Child pages

Versions Compared

Old Version 41

New Version Current

Key

Status

Motivation

Proposed Changes

Call Trace

Compatibility, Deprecation, and Migration Plan

Rejected Alternatives

Space shortcuts

Child pages

Page History

Versions Compared

Old Version 41

New Version Current

Key

Status

Motivation

Proposed Changes

Call Trace

Compatibility, Deprecation, and Migration Plan

Rejected Alternatives