Add note to upgrade section on DLR
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be sure to follow the recommendations therein.
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</para>
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</section>
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<section xml:id="dlr"><title>Distributed Log Replay</title>
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<para>
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<xref linkend="distributed.log.replay" /> is off by default in hbase-1.0.
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Enabling it can make a big difference improving HBase MTTR. Enable this
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feature if you are doing a clean stop/start when you are upgrading.
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You cannot rolling upgrade on to this feature (caveat if you are running
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on a version of hbase in excess of hbase-0.98.4 -- see
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<link xlink:href="https://issues.apache.org/jira/browse/HBASE-12577">HBASE-12577 Disable distributed log replay by default</link> for more).
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</para>
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</section>
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</section>
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<section xml:id="upgrade1.0.rolling.upgrade">
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<title>Rolling upgrade from 0.98.x to HBase 1.0.0</title>
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