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https://issues.apache.org/jira/browse/KAFKA-12571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kowshik Prakasam updated KAFKA-12571:
-------------------------------------
Description:
*This is a precursor to KAFKA-12553.*
Before refactoring the recovery logic (KAFKA-12553), we would like to move the
logic to [initialize
LeaderEpochFileCache|https://github.com/apache/kafka/blob/d9bb2ef596343da9402bff4903b129cff1f7c22b/core/src/main/scala/kafka/log/Log.scala#L579]
outside the Log class. Once we suitably initialize LeaderEpochFileCache
outside Log, we will be able pass it as a dependency into both the Log class
constructor and the recovery module. However, the LeaderEpochFileCache
constructor takes a
[dependency|https://github.com/apache/kafka/blob/d9bb2ef596343da9402bff4903b129cff1f7c22b/core/src/main/scala/kafka/server/epoch/LeaderEpochFileCache.scala#L42]
on logEndOffset (via a callback). This dependency prevents the instantiation
of LeaderEpochFileCache outside Log class.
This situation blocks the recovery logic (KAFKA-12553) refactor. So this
constructor dependency on logEndOffset needs to be eliminated.
It turns out the logEndOffset dependency is used only in 1 of the
LeaderEpochFileCache methods: LeaderEpochFileCache.endOffsetFor, and just for 1
particular [case|#L201]. Therefore, it should be possible to modify this so
that we only pass the logEndOffset as a parameter into endOffsetFor whenever
the method is called.
was:
*This is a precursor to KAFKA-12553.*
Before refactoring the recovery logic (KAFKA-12553), we would like to move the
logic to [initialize
LeaderEpochFileCache|https://github.com/apache/kafka/blob/d9bb2ef596343da9402bff4903b129cff1f7c22b/core/src/main/scala/kafka/log/Log.scala#L579]
outside the Log class. Once we suitably initialize LeaderEpochFileCache
outside Log, we will be able pass it as a dependency into both the Log class
constructor and the recovery module.
However, the LeaderEpochFileCache constructor takes a
[dependency|https://github.com/apache/kafka/blob/d9bb2ef596343da9402bff4903b129cff1f7c22b/core/src/main/scala/kafka/server/epoch/LeaderEpochFileCache.scala#L42]
on logEndOffset (via a callback). This dependency blocks the recovery logic
(KAFKA-12553) refactor since it prevents the instantiation of
LeaderEpochFileCache outside Log class. So this dependency needs to be
eliminated.
It turns out the logEndOffset dependency is used only in 1 of the
LeaderEpochFileCache methods: LeaderEpochFileCache.endOffsetFor, and just for 1
particular [case|#L201]. Therefore, it should be possible to modify this so
that we only pass the logEndOffset as a parameter into endOffsetFor whenever
the method is called.
> Eliminate LogEndOffset dependency on LeaderEpochFileCache c'tor
> ---------------------------------------------------------------
>
> Key: KAFKA-12571
> URL: https://issues.apache.org/jira/browse/KAFKA-12571
> Project: Kafka
> Issue Type: Sub-task
> Components: core
> Reporter: Kowshik Prakasam
> Assignee: Kowshik Prakasam
> Priority: Major
>
> *This is a precursor to KAFKA-12553.*
> Before refactoring the recovery logic (KAFKA-12553), we would like to move
> the logic to [initialize
> LeaderEpochFileCache|https://github.com/apache/kafka/blob/d9bb2ef596343da9402bff4903b129cff1f7c22b/core/src/main/scala/kafka/log/Log.scala#L579]
> outside the Log class. Once we suitably initialize LeaderEpochFileCache
> outside Log, we will be able pass it as a dependency into both the Log class
> constructor and the recovery module. However, the LeaderEpochFileCache
> constructor takes a
> [dependency|https://github.com/apache/kafka/blob/d9bb2ef596343da9402bff4903b129cff1f7c22b/core/src/main/scala/kafka/server/epoch/LeaderEpochFileCache.scala#L42]
> on logEndOffset (via a callback). This dependency prevents the instantiation
> of LeaderEpochFileCache outside Log class.
> This situation blocks the recovery logic (KAFKA-12553) refactor. So this
> constructor dependency on logEndOffset needs to be eliminated.
> It turns out the logEndOffset dependency is used only in 1 of the
> LeaderEpochFileCache methods: LeaderEpochFileCache.endOffsetFor, and just for
> 1 particular [case|#L201]. Therefore, it should be possible to modify this so
> that we only pass the logEndOffset as a parameter into endOffsetFor
> whenever the method is called.
>
>
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