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https://issues.apache.org/jira/browse/BOOKKEEPER-564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13648261#comment-13648261
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Ivan Kelly commented on BOOKKEEPER-564:
---------------------------------------
when a FileInfo is created fc is null. it only gets set when checkOpen(true) is
called. So if a FileInfo has been created but no operation has been called on
it that would call checkOpen(true), then fc is null and a call to
moveToNewLocation will give a NPE.
> Better checkpoint mechanism
> ---------------------------
>
> Key: BOOKKEEPER-564
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-564
> Project: Bookkeeper
> Issue Type: Improvement
> Components: bookkeeper-server
> Reporter: Sijie Guo
> Assignee: Sijie Guo
> Fix For: 4.3.0
>
> Attachments: 0001-BOOKKEEPER-564-Better-checkpoint-mechanism.patch,
> 0001-BOOKKEEPER-564-Better-checkpoint-mechanism.patch,
> 0001-BOOKKEEPER-564-CheckpointSource.patch,
> 0001-BOOKKEEPER-564-CheckpointSource.patch,
> 0001-BOOKKEEPER-564-CheckpointSource.patch,
> 0001-BOOKKEEPER-584-CheckpointSource.patch,
> 0002-BOOKKEEPER-564-Better-checkpoint-mechanism.patch, BOOKKEEPER-564.patch,
> BOOKKEEPER-564.patch, BOOKKEEPER-564.patch
>
>
> Currently, SyncThread made a checkpoint too frequently, which affects
> performance. data is writing to entry logger file might be blocked by syncing
> same entry logger file, which affect bookie to achieve higher throughput. We
> could schedule checkpoint only when rotating an entry log file. so new
> incoming entries would be written to newer entry log file and old entry log
> file could be synced.
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