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Add HA loop diagram (#352)

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Alejandro Martínez
2016-12-20 16:26:45 +01:00
committed by Alexander Kukushkin
parent 663bbb1048
commit 27dd9b4c6e
2 changed files with 116 additions and 0 deletions
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docs/ha_loop_diagram.dot
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// Graphviz source for ha_loop_diagram.png
// recompile with:
// dot -Tpng ha_loop_diagram.dot -o ha_loop_diagram.png
digraph G {
rankdir=TB;
fontname="sans-serif";
penwidth="0.3";
layout="dot";
newrank=true;
edge [fontname="sans-serif",
fontsize=12,
color=black,
fontcolor=black];
node [fontname=serif,
fontsize=12,
fillcolor=white,
color=black,
fontcolor=black,
style=filled];
"start" [label=Start, shape="rectangle", fillcolor="green"]
"start" -> "load_cluster_from_dcs";
subgraph cluster_run_cycle {
label="run_cycle"
"load_cluster_from_dcs" [label="Load cluster from DCS"];
"touch_member" [label="Persist node in DCS"];
"cluster.has_member" [shape="diamond", label="Is node registered on DCS?"]
"cluster.has_member" -> "touch_member" [label="no" color="red"];
"is_initialized" [shape="oval",
label="Ensure cluster is initialized on DCS"];
"has_lock" [label="Did I win the race to the leader lock?", shape=diamond];
"has_lock" -> "is_initialized" [label="yes" color="green"];
"has_lock" -> "handle_long_action_in_progress" [label="no" color="red"];
"load_cluster_from_dcs" -> "cluster.has_member";
"touch_member" -> "has_lock";
"cluster.has_member" -> "has_lock" [label="yes" color="green"];
"handle_long_action_in_progress" [label="Wait for async operations to finish"];
"is_initialized" -> "handle_long_action_in_progress";
"handle_long_action_in_progress" -> "recovering?";
"recovering?" [label="Was cluster recovering and failed?", shape="diamond"];
"recovering?" -> "post_recover" [label="yes" color="green"];
"recovering?" -> "data_directory_empty" [label="no" color="red"];
"post_recover" [label="Remove leader key"];
"data_directory_empty" [label="Is data folder empty?", shape="diamond"];
"data_directory_empty" -> "bootstrap" [label="yes" color="green"];
"bootstrap" [label="Try to bootstrap node from leader\n(async)"]
"data_directory_empty" -> "data_belongs_to_cluster" [label="no" color="red"];
"data_belongs_to_cluster" [label="Does data dir belong to cluster?", shape="diamond"];
"data_belongs_to_cluster" -> "cluster_initialize" [label="yes" color="green"];
"data_belongs_to_cluster" -> "exit" [label="no" color="red"];
"cluster_initialize" [label="Is cluster initialized on DCS?" shape="diamond"]
"cluster_initialize" -> "dcs.initialize" [label="no" color="red"]
"cluster_initialize" -> "is_healthy" [label="yes" color="green"]
"dcs.initialize" [label="Initialize new cluster"];
"dcs.initialize" -> "is_healthy"
"is_healthy" [label="Is node healthy?\n(running Postgres)", shape="diamond"];
"recover" [label="Restart as read-only\nand set Recover flag"]
"is_healthy" -> "recover" [label="no" color="red"];
"is_healthy" -> "cluster.is_unlocked" [label="yes" color="green"];
"cluster.is_unlocked" [label="Does the cluster have a leader?", shape="diamond"]
}
"cluster.is_unlocked" -> "unhealthy_is_healthiest" [label="no" color="red"]
"cluster.is_unlocked" -> "healthy_has_lock" [label="yes" color="green"]
"bootstrap" -> "start"
"recover" -> "start"
"post_recover" -> "start";
subgraph cluster_process_healthy_cluster {
label = "process_healthy_cluster"
"healthy_has_lock" [label="Did I win the race to the leader lock?", shape=diamond]
"healthy_is_leader" [label="Is Postgres running as master?", shape=diamond]
"healthy_no_lock" [label="Is Postgres running as master?", shape=diamond]
"healthy_no_lock" -> "healthy_demote" [label="yes" color="green"]
"healthy_has_lock" -> "healthy_no_lock" [label="no" color="red"]
"healthy_has_lock" -> "healthy_is_leader" [label="yes" color="green"]
"healthy_failover" [label="Promote Postgres to master"]
"healthy_is_leader" -> "healthy_failover" [label="no" color="red"]
"healthy_is_leader" -> "renew_lock" [label="yes" color="green"]
"healthy_failover" -> "renew_lock"
"renew_lock" [label="Renew leader lock"]
"healthy_demote" [label="Demote Postgres to secondary"]
"healthy_no_lock" -> "healthy_start" [label="no" color="red"]
"healthy_demote" -> "healthy_start"
"renew_lock" -> "healthy_start"
"healthy_start" [label="Go to start", shape=rectangle, fillcolor=green]
}
subgraph cluster_process_unhealthy_cluster {
label = "process_unhealthy_cluster"
"unhealthy_is_healthiest" [label="Am I the healthiest node?", shape="diamond"]
"unhealthy_is_healthiest" -> "unhealthy_acquire_lock" [label="yes, try to get lock"]
"unhealthy_acquire_lock" [label="Was I able to get the lock?", shape="diamond"]
"unhealthy_acquire_lock" -> "unhealthy_failover_key" [label="yes" color="green"]
"unhealthy_failover_key" [label="Is there a failover key set?", shape="diamond"]
"unhealthy_failover_key" -> "unhealthy_clean_failover_key" [label="yes" color="green"]
"unhealthy_failover_key" -> "unhealthy_promote" [label="yes" color="green"]
"unhealthy_clean_failover_key" [label="Clean failover key"]
"unhealthy_clean_failover_key" -> unhealthy_promote
"unhealthy_promote" [label="Promote to master"]
"unhealthy_is_healthiest" -> "unhealthy_need_rewind" [label="no" color="red"]
"unhealthy_need_rewind" [label="Do I need to be rewinded?", shape="diamond"]
"unhealthy_need_rewind" -> "unhealthy_set_rewind_flag" [label="yes" color="green"]
"unhealthy_need_rewind" -> "unhealthy_demote" [label="no" color="red"]
"unhealthy_set_rewind_flag" [label="Set rewind flag"]
unhealthy_set_rewind_flag -> unhealthy_demote
"unhealthy_demote" [label="Demote and follow somebody else"]
"unhealthy_demote" -> "unhealthy_start"
"unhealthy_acquire_lock" -> "unhealthy_start" [label="no" color="red"]
"unhealthy_promote" -> "unhealthy_start"
"unhealthy_start" [label="Go to start", shape=rectangle, fillcolor=green]
}
"exit" [label="Fail and exit", fillcolor=red]
}