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ID | IEP-59 | ||||||||
Author | |||||||||
Sponsor | Nikolay IzhikovAnton Vinogradov | ||||||||
Created | 14.10.2020 | ||||||||
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Table of Contents |
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Many use-cases build on observation and processing changed records.
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draw.io Diagram | ||||||||||||||||||||
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IgniteCDC Ignite CDC is a new utility that should be run on the server node host. CDC utility watches by the appearance of the WAL archive segments.
On the segment archiving, the utility iterates it using the existing WALIterator and notificates CDCConsumer of each record from the segment.WAL Iterator and notifications CDC Consumer of each record from the segment.
Public APICDCConsumer public API interface:
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/** Consumer of data change events. */ @IgniteExperimental public interface DataChangeListener<K, V> { /** * @return Consumer ID. */ String id(); ChangeDataCaptureConsumer { /** * Starts the consumer. */ * @param configuration Ignite configuration. */ public void start(IgniteConfiguration configuration, IgniteLogger log); /** * @return {@code True} if entry key and value should be keeped in binary format. */ boolean keepBinary(); /** * Handles entry changes events. * If this method return {@code true} then current offset will be stored * and ongoing notifications after CDC application fail/restart * will be started from it. * * @param events Entry change events. * @return {@code True} if current offset should be commitedsaved on the disk * to continue from it in case any failures or restart. */ public boolean onChange(Iterable<EntryEvent<K, V>>onEvents(Iterator<ChangeDataCaptureEvent> events); /** * Stops the consumer. * This methods can be invoked only after {@link #start(IgniteConfiguration, IgniteLogger)}. */ public void stop(); } /** * Event forof single entry change. * * @param <K> Key type. Instance presents new value of modified entry. * * @param <V> Value type.@see IgniteCDC * @see CaptureDataChangeConsumer */ @IgniteExperimental public interface EntryEvent<K, V>ChangeDataCaptureEvent extends Serializable { /** * @return Key for the changed entry. */ public KObject key(); /** * @return Value for the changed entry or {@code null} in case of entry removal. */ @Nullable public VObject value(); /** * @return {@code True} if event fired on primary node for partition containing this entry. * @see <a href=" * https://ignite.apache.org/docs/latest/configuring-caches/configuring-backups#configuring-partition-backups">Configuring> * Configuring partition backups.</a> */ public boolean primary(); /** * Ignite split dataset into smaller chunks to distribute them across the cluster. * {@link ChangeDataCaptureConsumer} implementations can use {@link #partition()} to split changes processing * in the same way as it done for the cache. * * @return Operation type Partition number. * @see Affinity#partition(Object) * @see Affinity#partitions() * @see <a href="https://ignite.apache.org/docs/latest/data-modeling/data-partitioning">Data partitioning</a> * @see <a href="https://ignite.apache.org/docs/latest/data-modeling/affinity-collocation">Affinity collocation</a> */ public int partition(); /** * @return Version of the entry. */ public EntryEventTypeCacheEntryVersion operationversion(); /** * @return Cache ID. * @see org.apache.ignite.internal.util.typedef.internal.CU#cacheId(String) * @see CacheView#cacheId() */ public int cacheId(); } /** * Entry event order. * Two concurrent updates of the same entry can be ordered based on {@link ChangeEventOrder} comparsion. * Greater value means that event occurs later. */ @IgniteExperimental public interface CacheEntryVersion extends Comparable<CacheEntryVersion>, Serializable { /** * Order of the update. Value is an incremental counter value. Scope of counter is node. * @return Version order. */ public long cacheId order(); /** @return Node order on which this version was assigned. */ public int nodeOrder(); /** * Cluster id is a value to distinguish updates in case user wants to aggregate and sort updates from several * Ignite clusters. {@code clusterId} id can be set for the node using * {@link GridCacheVersionManager#dataCenterId(byte)}. * * @return Cluster id. */ public byte clusterId(); /** @return Expire time. Topology version plus number of seconds from the start time of the first grid node. */ public int topologyVersion(); /** * If source of the update is "local" cluster then {@code null} will be returned. * If updated comes from the other cluster using {@link IgniteInternalCache#putAllConflict(Map)} * then entry version for other cluster. * @return Replication version. * @see IgniteInternalCache#putAllConflict(Map) * @see IgniteInternalCache#removeAllConflict(Map) */ longpublic CacheEntryVersion expireTimeotherClusterVersion(); } |
Risks and Assumptions
https://dev.mysql.com/doc/refman/8.0/en/mysqlbinlog.html
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