BIND 10 #1416: buffered read of journal

[BIND 10 Development]

#1416: buffered read of journal
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 I believe DatabaseJournalReader should do buffered read so that
 it can minimize the period of holding the database lock.  While it's
 a kind of optimization, I think it's quite crucial for production-like
 environment, and suggest doing so earlier.

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Ticket URL: <http://bind10.isc.org/ticket/1416>
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