[jira] [Created] (KAFKA-5841) Open old index files with read-only permission

[Jason Gustafson (JIRA)]

Jason Gustafson created KAFKA-5841:
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             Summary: 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


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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