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https://issues.apache.org/jira/browse/IGNITE-18209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ilya Shishkov updated IGNITE-18209:
-----------------------------------
Description:
Currently, there is a bottleneck in synchronized method
{{KafkaToIgniteMetadataUpdater#updateMetadata}}:
# {{KafkaToIgniteCdcStreamer}} contains multiple
{{KafkaToIgniteCdcStreamerApplier}} which shares _single_
{{KafkaToIgniteMetadataUpdater}}.
# All appliers handle corrsponding partitions consequently.
# {{META_UPDATE_MARKER}} is sent twice to each partition of event topic:
firstly, in case of type mappings updates, secondly, in case of binary types
update.
# When first {{KafkaToIgniteCdcStreamerApplier}} meets {{META_UPDATE_MARKER}}
it calls {{KafkaToIgniteMetadataUpdater#updateMetadata}} which in turn calls
{{KafkaConsumer#poll}}.
# {{KafkaConsumer#poll}} returns immediately [1] when there are data in
metadata topic. If there are few binary types and mappings to update, some
{{KafkaToIgniteCdcStreamerApplier}} thread will consume all entries from
metadata topic.
# All other threads of all {{KafkaToIgniteCdcStreamerApplier}} will call
{{KafkaConsumer#poll}} from empty metadata topic, which will remain blocked
until new data becomes available or request timeout occurs [1].
# Because of {{synchronized}} access to
{{KafkaToIgniteMetadataUpdater#updateMetadata}} all threads of all
{{KafkaToIgniteCdcStreamerApplier}} will form a sequence of calls. Each call
will block remaining appliers threads for {{kafkaReqTimeout}} period (if
metadata topic remains empty).
# The last call, i.e. last partition polling in this chain will happen after
{{(partitionsCount x 2 - 1) x kafkaReqTimeout}}. For example for default
timeout and 16 partitions _last partition will be consumed after approximately
1.5 minutes_.
# Amount of threads in {{KafkaToIgniteCdcStreamer}} does not make sence.
was:
Currently, there is a bottleneck in synchronized method
{{KafkaToIgniteMetadataUpdater#updateMetadata}}:
# {{KafkaToIgniteCdcStreamer}} contains multiple
{{KafkaToIgniteCdcStreamerApplier}} which shares _single_
{{KafkaToIgniteMetadataUpdater}}.
# All appliers handle corrsponding partitions consequently.
# {{META_UPDATE_MARKER}} is sent twice to each partition of event topic:
firstly, in case of type mappings updates, secondly, in case of binary types
update.
# When first {{KafkaToIgniteCdcStreamerApplier}} meets {{META_UPDATE_MARKER}}
it calls {{KafkaToIgniteMetadataUpdater#updateMetadata}} which in turn calls
{{KafkaConsumer#poll}}.
# {{KafkaConsumer#poll}} returns immediately [1] when there are data in
metadata topic. If there are few binary types and mappings to update, some
{{KafkaToIgniteCdcStreamerApplier}} thread will consume all entries from
metadata topic.
# All other threads of all {{KafkaToIgniteCdcStreamerApplier}} will call
{{KafkaConsumer#poll}} from empty metadata topic, which will remain blocked
until new data becomes available or request timeout occurs [1].
# Because of {{synchronized}} access to
{{KafkaToIgniteMetadataUpdater#updateMetadata}} all threads of all
{{KafkaToIgniteCdcStreamerApplier}} will form a sequence of calls. Each call
will block remaining appliers threads for {{kafkaReqTimeout}} period (if
metadata topic remains empty).
# The last call, i.e. last partition polling in this chain will happen after
{{(partitionsCount x 2 - 1) x kafkaReqTimeout}}. For example for default
timeout and 16 partitions _last partition will be consumed after approximately
1.5 minutes_. Amount of thread does not make sence.
> Reduce binary metadata synchronization time for CDC through Kafka
> -----------------------------------------------------------------
>
> Key: IGNITE-18209
> URL: https://issues.apache.org/jira/browse/IGNITE-18209
> Project: Ignite
> Issue Type: Improvement
> Components: extensions
> Reporter: Ilya Shishkov
> Priority: Minor
> Labels: IEP-59, ise
>
> Currently, there is a bottleneck in synchronized method
> {{KafkaToIgniteMetadataUpdater#updateMetadata}}:
> # {{KafkaToIgniteCdcStreamer}} contains multiple
> {{KafkaToIgniteCdcStreamerApplier}} which shares _single_
> {{KafkaToIgniteMetadataUpdater}}.
> # All appliers handle corrsponding partitions consequently.
> # {{META_UPDATE_MARKER}} is sent twice to each partition of event topic:
> firstly, in case of type mappings updates, secondly, in case of binary types
> update.
> # When first {{KafkaToIgniteCdcStreamerApplier}} meets {{META_UPDATE_MARKER}}
> it calls {{KafkaToIgniteMetadataUpdater#updateMetadata}} which in turn calls
> {{KafkaConsumer#poll}}.
> # {{KafkaConsumer#poll}} returns immediately [1] when there are data in
> metadata topic. If there are few binary types and mappings to update, some
> {{KafkaToIgniteCdcStreamerApplier}} thread will consume all entries from
> metadata topic.
> # All other threads of all {{KafkaToIgniteCdcStreamerApplier}} will call
> {{KafkaConsumer#poll}} from empty metadata topic, which will remain blocked
> until new data becomes available or request timeout occurs [1].
> # Because of {{synchronized}} access to
> {{KafkaToIgniteMetadataUpdater#updateMetadata}} all threads of all
> {{KafkaToIgniteCdcStreamerApplier}} will form a sequence of calls. Each call
> will block remaining appliers threads for {{kafkaReqTimeout}} period (if
> metadata topic remains empty).
> # The last call, i.e. last partition polling in this chain will happen after
> {{(partitionsCount x 2 - 1) x kafkaReqTimeout}}. For example for default
> timeout and 16 partitions _last partition will be consumed after
> approximately 1.5 minutes_.
> # Amount of threads in {{KafkaToIgniteCdcStreamer}} does not make sence.
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