8000 Introducing Replicated Logs (#14486) · arangodb/arangodb@c3c390b · GitHub
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Lars Maier
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Introducing Replicated Logs (#14486)
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‎Documentation/Metrics/arangodb_replication2_replicated_log_append_entries_rtt.yaml

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name: arangodb_replication2_replicated_log_append_entries_rtt
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introducedIn: "3.9.0"
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help: |
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Histogram of the RTT of appendEntries requests in microseconds.
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unit: us
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type: histogram
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category: Replication
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complexity: medium
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exposedBy:
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- dbserver
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- single
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description: |
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The leader of a replicated log replicates the log entries by sending
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appendEntries requests to its followers.
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This is a histogram keeping track of the number of such requests this
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server sends (for any log it is a leader of), as well as their respective
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round-trip times in microseconds.

‎Documentation/Metrics/arangodb_replication2_replicated_log_creation_total.yaml

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name: arangodb_replication2_replicated_log_creation_total
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introducedIn: "3.9.0"
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help: |
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Number of replicated log instances created on this server since its start.
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unit: number
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type: counter
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category: Replication
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complexity: simple
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exposedBy:
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- dbserver
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- single
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description: |
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Number of replicated log instances created on this server since its start.

‎Documentation/Metrics/arangodb_replication2_replicated_log_deletion_total.yaml

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name: arangodb_replication2_replicated_log_deletion_total
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introducedIn: "3.9.0"
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help: |
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Number of replicated log instances deleted on this server since its start.
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unit: number
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type: counter
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category: Replication
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complexity: simple
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exposedBy:
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- dbserver
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- single
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description: |
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Number of replicated log instances deleted on this server since its start.

‎Documentation/Metrics/arangodb_replication2_replicated_log_follower_append_entries_rt.yaml

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name: arangodb_replication2_replicated_log_follower_append_entries_rt
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introducedIn: "3.9.0"
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help: |
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Histogram of the duration of appendEntries calls in microseconds.
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unit: us
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type: histogram
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category: Replication
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complexity: advanced
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exposedBy:
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- dbserver
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- single
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description: |
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Followers of a replicated log, including the local followers for persistence
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each leader has, receive appendEntries requests. These contain log entries
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to be replicated. Serving these requests means writing them to persistence.
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This histogram counts the number of such requests server by this server,
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plus their respective runtime in microseconds.

‎Documentation/Metrics/arangodb_replication2_replicated_log_follower_number.yaml

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name: arangodb_replication2_replicated_log_follower_number
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introducedIn: "3.9.0"
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help: |
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Current number of followers of replicated logs.
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unit: number
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type: gauge
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category: Replication
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complexity: simple
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exposedBy:
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- dbserver
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- single
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description: |
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Current number of replicated logs this server is a follower of.

‎Documentation/Metrics/arangodb_replication2_replicated_log_inactive_number.yaml

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name: arangodb_replication2_replicated_log_inactive_number
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introducedIn: "3.9.0"
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help: |
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Current number of inactive replicated logs.
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unit: number
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type: gauge
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category: Replication
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complexity: simple
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exposedBy:
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- dbserver
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- single
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description: |
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Current number of replicated logs this server is a participant of,
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but is not yet configured to be either a leader or a follower. This
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number should usually be zero, except during server startup until
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the configuration from the Agency is fetched and applied, and for
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a short time when a log is newly created.

‎Documentation/Metrics/arangodb_replication2_replicated_log_inserts_bytes.yaml

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name: arangodb_replication2_replicated_log_inserts_bytes
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introducedIn: "3.9.0"
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help: |
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Number of bytes inserted into replicated logs.
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unit: bytes
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type: histogram
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category: Replication
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complexity: medium
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exposedBy:
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- dbserver
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- single
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description: |
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For all replicated logs this server is a leader of, this counts the number
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of bytes of raw payload inserted into it.

‎Documentation/Metrics/arangodb_replication2_replicated_log_inserts_rtt.yaml

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name: arangodb_replication2_replicated_log_inserts_rtt
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introducedIn: "3.9.0"
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help: |
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Round-trip time of inserts into replicated logs in microseconds.
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unit: us
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type: histogram
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category: Replication
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complexity: medium
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exposedBy:
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- dbserver
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- single
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description: |
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Inserts into replicated logs this server is a leader of are counted by this
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histogram, plus their respective round-trip time. This includes the time for
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replication, at least until the writeConcern is satisified.

‎Documentation/Metrics/arangodb_replication2_replicated_log_leader_number.yaml

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name: arangodb_replication2_replicated_log_leader_number
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introducedIn: "3.9.0"
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help: |
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Current number of replicated log leaders.
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unit: number
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type: gauge
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category: Replication
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complexity: simple
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exposedBy:
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- dbserver
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- single
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description: |
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Number of replicated logs this server is currently a leader of.

‎Documentation/Metrics/arangodb_replication2_replicated_log_leader_took_over_total.yaml

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name: arangodb_replication2_replicated_log_leader_took_over_total
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introducedIn: "3.9.0"
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help: |
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Number of leader takeovers.
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unit: number
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type: counter
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category: Replication
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complexity: medium
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exposedBy:
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- dbserver
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- single
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description: |
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Number of times this server took over the leadership of a replicated log
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since server start.

‎Documentation/Metrics/arangodb_replication2_replicated_log_number.yaml

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name: arangodb_replication2_replicated_log_number
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introducedIn: "3.9.0"
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help: |
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Number of replicated logs.
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unit: number
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type: counter
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category: Replication
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complexity: simple
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exposedBy:
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- dbserver
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- single
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description: |
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Number of replicated logs this server is a participant of.

‎Documentation/Metrics/arangodb_replication2_replicated_log_started_following_total.yaml

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name: arangodb_replication2_replicated_log_started_following_total
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introducedIn: "3.9.0"
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help: |
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Number of times started following a replicated log.
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unit: number
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type: counter
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ca FFD5 tegory: Replication
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complexity: medium
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exposedBy:
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- dbserver
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- single
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description: |
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Number of times this server started following a replicated log
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since server start.

‎arangod/Agency/AgencyPaths.cpp

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////////////////////////////////////////////////////////////////////////////////
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#include "AgencyPaths.h"
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#include <Replication2/ReplicatedLog/LogCommon.h>
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using namespace arangodb;
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using namespace arangodb::cluster;
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return Root::make_shared();
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}
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auto paths::to_string(Path const& path) -> std::string { return path.str(); }
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auto aliases::arango() -> std::shared_ptr<Root::Arango const> {
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return root()->arango();
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}
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auto aliases::supervision() -> std::shared_ptr<Root::Arango::Supervision const> {
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return root()->arango()->supervision();
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}
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auto Root::Arango::Plan::ReplicatedLogs::Database::log(replication2::LogId id) const
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-> std::shared_ptr<const Log> {
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return Log::make_shared(shared_from_this(), std::to_string(id.id()));
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}

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