8000 Release notes for 9.3.4, 9.2.8, 9.1.13, 9.0.17, 8.4.21. · Deepakkothandan/postgres@cc80df2 · GitHub
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Release notes for 9.3.4, 9.2.8, 9.1.13, 9.0.17, 8.4.21.
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‎doc/src/sgml/release-8.4.sgml

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<!-- doc/src/sgml/release-8.4.sgml -->
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<!-- See header comment in release.sgml about typical markup -->
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<sect1 id="release-8-4-21">
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<title>Release 8.4.21</title>
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<note>
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<title>Release Date</title>
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<simpara>2014-03-20</simpara>
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</note>
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<para>
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This release contains a variety of fixes from 8.4.20.
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For information about new features in the 8.4 major release, see
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<xref linkend="release-8-4">.
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</para>
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<para>
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The <productname>PostgreSQL</> community will stop releasing updates
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for the 8.4.X release series in July 2014.
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Users are encouraged to update to a newer release branch soon.
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</para>
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<sect2>
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<title>Migration to Version 8.4.21</title>
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<para>
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A dump/restore is not required for those running 8.4.X.
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</para>
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<para>
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However, if you are upgrading from a version earlier than 8.4.19,
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see <xref linkend="release-8-4-19">.
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</para>
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</sect2>
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<sect2>
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<title>Changes</title>
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<itemizedlist>
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<listitem>
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<para>
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Restore GIN metapages unconditionally to avoid torn-page risk
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(Heikki Linnakangas)
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</para>
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<para>
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Although this oversight could theoretically result in a corrupted
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index, it is unlikely to have caused any problems in practice, since
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the active part of a GIN metapage is smaller than a standard 512-byte
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disk sector.
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</para>
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</listitem>
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<listitem>
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<para>
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Allow regular-expression operators to be terminated early by query
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cancel requests (Tom Lane)
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</para>
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<para>
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This prevents scenarios wherein a pathological regular expression
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could lock up a server process uninterruptably for a long time.
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</para>
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</listitem>
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<listitem>
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<para>
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Remove incorrect code that tried to allow <literal>OVERLAPS</> with
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single-element row arguments (Joshua Yanovski)
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</para>
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<para>
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This code never worked correctly, and since the case is neither
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specified by the SQL standard nor documented, it seemed better to
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remove it than fix it.
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</para>
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</listitem>
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<listitem>
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<para>
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Avoid getting more than <literal>AccessShareLock</> when de-parsing a
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rule or view (Dean Rasheed)
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</para>
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<para>
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This oversight resulted in <application>pg_dump</> unexpectedly
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acquiring <literal>RowExclusiveLock</> locks on tables mentioned as
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the targets of <literal>INSERT</>/<literal>UPDATE</>/<literal>DELETE</>
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commands in rules. While usually harmless, that could interfere with
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concurrent transactions that tried to acquire, for example,
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<literal>ShareLock</> on those tables.
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</para>
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</listitem>
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<listitem>
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<para>
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Prevent interrupts while reporting non-<literal>ERROR</> messages
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(Tom Lane)
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</para>
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<para>
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This guards against rare server-process freezeups due to recursive
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entry to <function>syslog()</>, and perhaps other related problems.
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</para>
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</listitem>
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<listitem>
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<para>
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Update time zone data files to <application>tzdata</> release 2014a
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for DST law changes in Fiji and Turkey, plus historical changes in
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Israel and Ukraine.
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</para>
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<para>
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</para>
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</listitem>
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</itemizedlist>
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</sect2>
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</sect1>
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<sect1 id="release-8-4-20">
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<title>Release 8.4.20</title>
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