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https://issues.apache.org/jira/browse/KAFKA-5841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismael Juma resolved KAFKA-5841.
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Resolution: Not A Problem
We have a constructor parameter for this, so I don't think we need this method.
> Open old index files with read-only permission
> ----------------------------------------------
>
> Key: KAFKA-5841
> URL: https://issues.apache.org/jira/browse/KAFKA-5841
> Project: Kafka
> Issue Type: Improvement
> Reporter: Jason Gustafson
> Assignee: huxihx
> Priority: Major
>
> Since old index files do not change, we may as well drop the write permission
> needed when opening them. From the doc comments in {{OffsetIndex}}, it sounds
> like we may have had this implemented at one point:
> {code}
> * Index files can be opened in two ways: either as an empty, mutable index
> that allows appends or
> * an immutable read-only index file that has previously been populated. The
> makeReadOnly method will turn a mutable file into an
> * immutable one and truncate off any extra bytes. This is done when the
> index file is rolled over.
> {code}
> So we should either support this or (if there is good reason not to) update
> the comment.
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