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>E.76. Release 8.4.21</A
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><P
><B
>Release date: </B
>2014-03-20</P
></DIV
><P
> This release contains a variety of fixes from 8.4.20.
For information about new features in the 8.4 major release, see
<A
HREF="release-8-4.html"
>Section E.97</A
>.
</P
><P
> The <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> community will stop releasing updates
for the 8.4.X release series in July 2014.
Users are encouraged to update to a newer release branch soon.
</P
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>E.76.1. Migration to Version 8.4.21</A
></H2
><P
> A dump/restore is not required for those running 8.4.X.
</P
><P
> However, if you are upgrading from a version earlier than 8.4.19,
see <A
HREF="release-8-4-19.html"
>Section E.78</A
>.
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><H2
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>E.76.2. Changes</A
></H2
><P
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><UL
><LI
><P
> Restore GIN metapages unconditionally to avoid torn-page risk
(Heikki Linnakangas)
</P
><P
> Although this oversight could theoretically result in a corrupted
index, it is unlikely to have caused any problems in practice, since
the active part of a GIN metapage is smaller than a standard 512-byte
disk sector.
</P
></LI
><LI
><P
> Allow regular-expression operators to be terminated early by query
cancel requests (Tom Lane)
</P
><P
> This prevents scenarios wherein a pathological regular expression
could lock up a server process uninterruptibly for a long time.
</P
></LI
><LI
><P
> Remove incorrect code that tried to allow <TT
CLASS="LITERAL"
>OVERLAPS</TT
> with
single-element row arguments (Joshua Yanovski)
</P
><P
> This code never worked correctly, and since the case is neither
specified by the SQL standard nor documented, it seemed better to
remove it than fix it.
</P
></LI
><LI
><P
> Avoid getting more than <TT
CLASS="LITERAL"
>AccessShareLock</TT
> when de-parsing a
rule or view (Dean Rasheed)
</P
><P
> This oversight resulted in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> unexpectedly
acquiring <TT
CLASS="LITERAL"
>RowExclusiveLock</TT
> locks on tables mentioned as
the targets of <TT
CLASS="LITERAL"
>INSERT</TT
>/<TT
CLASS="LITERAL"
>UPDATE</TT
>/<TT
CLASS="LITERAL"
>DELETE</TT
>
commands in rules. While usually harmless, that could interfere with
concurrent transactions that tried to acquire, for example,
<TT
CLASS="LITERAL"
>ShareLock</TT
> on those tables.
</P
></LI
><LI
><P
> Prevent interrupts while reporting non-<TT
CLASS="LITERAL"
>ERROR</TT
> messages
(Tom Lane)
</P
><P
> This guards against rare server-process freezeups due to recursive
entry to <CODE
CLASS="FUNCTION"
>syslog()</CODE
>, and perhaps other related problems.
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2014a
for DST law changes in Fiji and Turkey, plus historical changes in
Israel and Ukraine.
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