docs: capture the SQL the other node actually runs, and correct the replication claim
PostgreSQL statement logging shows keycloak-1 reading and updating the session created on keycloak-0. The same transaction reveals optimistic locking via VERSION, SKIP LOCKED, and synchronous_commit turned off. Fixes the earlier concept note that credited Infinispan with cross-node propagation. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
DongHyeonka
co-authored by
Claude Opus 5
Claude Opus 5
parent
e5ebaeb623
commit
22d873eb4f
+108
@@ -0,0 +1,108 @@
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#!/usr/bin/env bash
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# Experiment 0d — capture the actual SQL that the OTHER node runs.
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#
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# Experiments 0b/0c showed that session entries never appear in keycloak-1's
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# memory, yet keycloak-1 can use a session keycloak-0 created. The conclusion
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# "keycloak-1 reads it from PostgreSQL" was an inference, not an observation.
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#
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# This script turns on statement logging in PostgreSQL for a few seconds, sends
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# ONE refresh request to keycloak-1 for a session born on keycloak-0, and greps
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# the database log for that session id. If the inference is right, the SQL is
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# there, issued from keycloak-1's pod IP.
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#
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# It also checks whether serving that request makes keycloak-1 cache the session
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# — which sharpens "each node caches what it handled" from "what it logged in"
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# to "what it touched".
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set -uo pipefail
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NS="${NS:-keycloak-lab}"
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PSQL="kubectl -n $NS exec deploy/postgres -- psql -U keycloak -d keycloak -tAc"
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K0_IP=$(kubectl -n "$NS" get pod keycloak-0 -o jsonpath='{.status.podIP}')
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K1_IP=$(kubectl -n "$NS" get pod keycloak-1 -o jsonpath='{.status.podIP}')
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ADMIN_PW=$(kubectl -n "$NS" get secret keycloak-lab-secrets \
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-o jsonpath='{.data.KC_BOOTSTRAP_ADMIN_PASSWORD}' | base64 -d)
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echo "수집 시각: $(date '+%Y-%m-%d %H:%M:%S %Z')"
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echo " keycloak-0 = $K0_IP (세션을 만드는 노드)"
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echo " keycloak-1 = $K1_IP (읽기만 하는 노드)"
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echo
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# %h 를 넣어야 어느 파드가 보낸 질의인지 로그에서 구분된다.
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echo "=== PostgreSQL 문장 로깅을 켠다 ==="
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$PSQL "alter system set log_statement='all'" >/dev/null 2>&1
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$PSQL "alter system set log_line_prefix='%m [%p] %h '" >/dev/null 2>&1
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$PSQL "select pg_reload_conf()" >/dev/null 2>&1
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echo " log_statement = $($PSQL 'show log_statement' 2>/dev/null)"
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echo " log_line_prefix = $($PSQL 'show log_line_prefix' 2>/dev/null)"
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echo
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# 로그 커서를 잡아둔다. 이 줄 수 이후만 본다.
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LOG_BEFORE=$(kubectl -n "$NS" logs deploy/postgres --tail=-1 2>/dev/null | wc -l)
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RESULT=$(kubectl -n "$NS" run kc-readpath --rm -i --restart=Never \
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--image=curlimages/curl:8.11.1 --quiet --command -- sh -c "
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O=/tmp/o; : > \$O
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TOKEN_EP='/realms/master/protocol/openid-connect/token'
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jget() { sed -n \"s/.*\\\"\$1\\\":\\\"\\([^\\\"]*\\)\\\".*/\\1/p\"; }
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ent() {
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curl -s --retry 3 --max-time 20 http://\$1:9000/metrics \
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| grep -E '^vendor_statistics_approximate_entries_unique.cache=.sessions' | awk '{print \$NF}'
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}
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# keycloak-0 에서 로그인한다
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L=\$(curl -s -X POST \"http://$K0_IP:8080\$TOKEN_EP\" -d grant_type=password \
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-d client_id=admin-cli -d username=admin -d 'password=$ADMIN_PW')
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SID=\$(echo \"\$L\" | jget access_token | cut -d. -f2 | sed 's/\$/==/' | base64 -d 2>/dev/null | jget sid)
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RT=\$(echo \"\$L\" | jget refresh_token)
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echo \"SID=\$SID\" >> \$O
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echo \"K1_ENTRIES_BEFORE=\$(ent $K1_IP)\" >> \$O
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sleep 2
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# 반대편 노드에 refresh 를 딱 한 번 보낸다
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# 인용을 한 겹 더 쌓으면 curl 이 URL 을 통째로 못 읽는다. 실제로 000 이 나왔다.
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CODE=\$(curl -s -o /dev/null -w '%{http_code}' -X POST \
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\"http://$K1_IP:8080\$TOKEN_EP\" \
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-d grant_type=refresh_token -d client_id=admin-cli -d \"refresh_token=\$RT\")
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echo \"REFRESH_ON_K1=\$CODE\" >> \$O
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sleep 3
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echo \"K1_ENTRIES_AFTER=\$(ent $K1_IP)\" >> \$O
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cat \$O
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" 2>&1 | grep -v '^pod .* deleted$')
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echo "=== 요청 ==="
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echo "$RESULT" | sed 's/^/ /'
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SID=$(echo "$RESULT" | sed -n 's/^SID=//p')
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echo
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echo "=== PostgreSQL 문장 로깅을 끈다 ==="
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$PSQL "alter system reset log_statement" >/dev/null 2>&1
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$PSQL "alter system reset log_line_prefix" >/dev/null 2>&1
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$PSQL "select pg_reload_conf()" >/dev/null 2>&1
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echo " log_statement = $($PSQL 'show log_statement' 2>/dev/null)"
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echo
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echo "=== keycloak-1 이 실제로 보낸 SQL 문장 ==="
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echo " (파라미터가 \$1 로 묶여 있어, sid 는 바로 아래 DETAIL 줄에 있다)"
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echo
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kubectl -n "$NS" logs deploy/postgres --tail=-1 2>/dev/null \
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| tail -n +$((LOG_BEFORE + 1)) \
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| grep -F "$K1_IP" | grep -E "LOG: execute" \
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| sed 's/.*execute [^:]*: //' | sed 's/^/ /' | head -12
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echo
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echo "=== 그 sid 를 언급한 SQL — 누가 보냈는가 ==="
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echo " 찾는 sid: $SID"
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echo
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kubectl -n "$NS" logs deploy/postgres --tail=-1 2>/dev/null \
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| tail -n +$((LOG_BEFORE + 1)) \
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| grep -F "$SID" \
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| sed -e "s/$K0_IP/[keycloak-0]/g" -e "s/$K1_IP/[keycloak-1]/g" \
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| cut -c1-220 \
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| head -20
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echo
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echo "=== 요약: 파드별 질의 건수 ==="
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kubectl -n "$NS" logs deploy/postgres --tail=-1 2>/dev/null \
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| tail -n +$((LOG_BEFORE + 1)) \
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| grep -F "$SID" \
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| grep -oE "^[0-9-]+ [0-9:.]+ [A-Z]+ \[[0-9]+\] [0-9.]+" \
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| awk '{print $NF}' | sort | uniq -c \
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| sed -e "s/$K0_IP/[keycloak-0]/" -e "s/$K1_IP/[keycloak-1]/" -e 's/^/ /'
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