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diff --git a/qa/835 b/qa/835
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+#!/bin/sh
+# PCP QA Test No. 835
+# Exercise the memcache PMDA - install, remove and values.
+#
+# Copyright (c) 2014 Red Hat.
+# Copyright (c) 2014 Ken McDonell.  All Rights Reserved.
+# Copyright (c) 2008 Aconex.  All Rights Reserved. (based on qa/348)
+#
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+# get standard environment, filters and checks
+. ./common.product
+. ./common.filter
+. ./common.check
+
+port=11211
+echo stats | $PCP_BINADM_DIR/telnet-probe localhost $port || \
+    _notrun "Noones home on the default memcached port $port"
+
+status=1	# failure is the default!
+$sudo rm -rf $tmp.* $seq.full
+
+pmdamemcache_remove()
+{
+    echo
+    echo "=== remove memcache agent ==="
+    $sudo ./Remove >$tmp.out 2>&1
+    _filter_pmda_remove <$tmp.out
+}
+
+pmdamemcache_install()
+{
+    # start from known starting points
+    cd $PCP_PMDAS_DIR/memcache
+    $sudo ./Remove >/dev/null 2>&1
+    $sudo $PCP_RC_DIR/pmcd stop
+
+    cat <<EOF >$tmp.config
+$memcache_delay = 1;
+@memcache_instances = ( 0 => '127.0.0.1:11211' );
+EOF
+    echo "pmdamemcache config:" >> $here/$seq.full
+    cat $tmp.config >> $here/$seq.full
+
+    [ -f $PCP_PMDAS_DIR/memcache/memcache.conf ] && \
+    $sudo cp $PCP_PMDAS_DIR/memcache/memcache.conf $tmp.backup
+    $sudo cp $tmp.config $PCP_PMDAS_DIR/memcache/memcache.conf
+
+    echo
+    echo "=== memcache agent installation ==="
+    $sudo ./Install </dev/null >$tmp.out 2>&1
+    # Check metrics have appeared ... X metrics and Y values
+    _filter_pmda_install <$tmp.out \
+    | sed \
+        -e '/^Waiting for pmcd/s/\.\.\.[. ]*$/DOTS/' \
+    | $PCP_AWK_PROG '
+/Check memcache metrics have appeared/  { if ($7 >= 16 && $7 <= 50) $7 = "X"
+                                          if ($10 >= 16 && $10 <= 50) $10 = "Y"
+                                        }
+                                        { print }'
+}
+
+pmdamemcache_cleanup()
+{
+    if [ -f $tmp.backup ]; then
+	$sudo cp $tmp.backup $PCP_PMDAS_DIR/memcache/memcache.conf
+	$sudo rm $tmp.backup
+    else
+	$sudo rm -f $PCP_PMDAS_DIR/memcache/memcache.conf
+    fi
+    _cleanup_pmda memcache
+}
+
+_prepare_pmda memcache
+trap "cd $here; rm -fr $tmp.*; exit \$status" 0 1 2 3 15
+trap "pmdamemcache_cleanup; exit \$status" 0 1 2 3 15
+
+# make pmprobe output comparable to memcachestats
+rewrite_memcache_metric_names()
+{
+    sed \
+	-e 's/^memcache.//g' \
+	-e 's/^gets /cmd_get /g' \
+	-e 's/^sets /cmd_set /g' \
+	-e 's/^hits /get_hits /g' \
+	-e 's/^misses /get_misses /g' \
+	-e 's/^current_items/curr_items/g' \
+	-e 's/^current_connections/curr_connections/g' \
+    #end#
+}
+
+# real QA test starts here
+pmdamemcache_install
+
+echo
+echo "=== extract metric values ==="
+pmprobe -v memcache \
+| rewrite_memcache_metric_names \
+| LC_COLLATE=POSIX sort >$tmp.probe
+echo "from pmprobe ..." >>$here/$seq.full
+
+$here/src/memcachestats.pl \
+| sed -e 's/ / 1 /' \
+| LC_COLLATE=POSIX sort >$tmp.values
+echo "from src/memcachestats.pl ..." >>$here/$seq.full
+
+cat $tmp.values >>$here/$seq.full
+LC_COLLATE=POSIX join $tmp.probe $tmp.values >$tmp.all
+echo >>$here/$seq.full
+cat $tmp.all >>$here/$seq.full
+
+echo
+echo "=== check values ==="
+cat $tmp.all \
+| while read metric n1 vpcp n2 vmemcache
+do
+    if [ "$n1" = 1 -a "$n2" = 1 ]
+    then
+        case $metric
+        in
+            total_connections)
+                _within_tolerance $metric $vpcp $vmemcache 5 -v
+                ;;
+            *)
+                _within_tolerance $metric $vpcp $vmemcache 10% -v
+                ;;
+        esac
+    else
+        echo "$metric: number of values not 1 as expected: pcp $n1 / memcache $n2"
+    fi
+done | tee -a $here/$seq.full
+
+pmdamemcache_remove
+status=0
+exit