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23 results

xlog.c

  • Tom Lane's avatar
    5c8eb929
    When telling the bgwriter that we need a checkpoint because too much xlog · 5c8eb929
    Tom Lane authored 
    has been consumed, recheck against the latest value of RedoRecPtr before
really sending the signal.  This avoids useless checkpoint activity if
XLogWrite is executed when we have a very stale local copy of RedoRecPtr.
The potential for useless checkpoint is very much worse in 8.3 because of
the walwriter process (which never does XLogInsert), so while this behavior
was intentional, it needs to be changed.  Per report from Itagaki Takahiro.
    5c8eb929
    History
    When telling the bgwriter that we need a checkpoint because too much xlog
    Tom Lane authored 
    has been consumed, recheck against the latest value of RedoRecPtr before
really sending the signal.  This avoids useless checkpoint activity if
XLogWrite is executed when we have a very stale local copy of RedoRecPtr.
The potential for useless checkpoint is very much worse in 8.3 because of
the walwriter process (which never does XLogInsert), so while this behavior
was intentional, it needs to be changed.  Per report from Itagaki Takahiro.