Obsolete:Session failure

Session failure grouped by the memcached server which contains the session

[2345][tstarling@zwinger:/home/wikipedia/common/php-1.5/maintenance]
$ perl -ne 'if (/mc get\((.*?)\)/) { print "server $1\n";}' \
 /home/wikipedia/logs/session_debug/session.log | sort | uniq | php mcc.php \
 | sort | uniq -c | sort -n
     38 10.0.2.22:11003
     40 10.0.2.21:11000
     40 10.0.2.24:11002
     41 10.0.2.23:11000
     41 10.0.2.25:11001
     42 10.0.2.27:11002
     43 10.0.2.24:11001
     45 10.0.2.23:11003
     45 10.0.2.25:11000
     45 10.0.2.25:11002
     45 10.0.2.27:11001
     46 10.0.2.23:11002
     48 10.0.2.21:11002
     48 10.0.2.21:11003
     50 10.0.2.24:11003
     51 10.0.2.22:11000
     52 10.0.2.27:11003
     53 10.0.2.23:11001
     54 10.0.2.24:11000
     55 10.0.2.25:11003
     56 10.0.2.21:11001
     56 10.0.2.22:11002
     64 10.0.2.27:11000
    208 10.0.2.22:11001
    366 10.0.0.19:11003
    374 10.0.0.19:11002
    377 10.0.0.19:11001
    388 10.0.0.19:11000

Grouped by apache server (no problems here):

[2359][tstarling@zwinger:/home/wikipedia/common/php-1.5/maintenance]
$ perl -ne 'if (/^apache server=(.*)$/) { print "$1\n";}' \
 /home/wikipedia/logs/session_debug/session.log | sort | uniq -c | sort -n
      4 rose
      6 srv27
     43 srv37
    124 srv35
    156 srv25
    157 harris
    158 srv22
    164 alrazi
    164 srv21
    166 srv0
    167 kluge
    171 hypatia
    177 diderot
    177 srv20
    178 srv15
    181 srv23
    182 srv12
    183 goeje
    183 srv18
    184 friedrich
    185 srv11
    185 srv19
    185 srv28
    187 srv3
    197 rabanus
    197 srv45
    197 srv47
    202 srv40
    203 srv36
    204 srv46
    206 srv14
    206 srv17
    208 srv30
    211 srv41
    213 srv38
    217 srv4
    221 srv43
    222 srv44
    224 srv33
    225 srv13
    230 srv50
    231 srv29
    233 srv32
    234 srv16
    240 srv48
    254 srv34
    265 srv49
    266 srv39