HostDB

The HostDB component of Traffic Server manages origin server name resolution and host health checks. The statistics documented here can help to ensure that your Traffic Server instances are not spending an unreasonable amount of timing resolving your origin servers’ hostnames prior to object revalidation or retrieval.

proxy.node.hostdb.hit_ratio_avg_10s

Represents the ratio of origin server name resolutions which were satisfied by the HostDB lookup cache over the last 10 seconds.

proxy.node.hostdb.hit_ratio

Represents the ratio of origin server name resolutions which were satisfied by the HostDB lookup cache since statistics collection began.

proxy.node.hostdb.total_hits_avg_10s

Represents the number of origin server name resolutions which were satisfied by the HostDB lookup cache over the last 10 seconds.

proxy.node.hostdb.total_hits

Represents the total number of origin server name resolutions which were satisfied by entries in the HostDB lookup cache, since statistics collection began.

proxy.node.hostdb.total_lookups_avg_10s

Represents the number of origin server name resolutions which were performed over the last 10 seconds, regardless of whether they were satisfied by the HostDB lookup cache.

proxy.node.hostdb.total_lookups

Represents the total number of origin server name resolutions which have been performed, since statistics collection began, regardless of whether they were satisfied by the HostDB lookup cache or required DNS lookups.

proxy.process.hostdb.bytes

Represents the number of bytes allocated to the HostDB lookup cache.

proxy.process.hostdb.re_dns_on_reload

proxy.process.hostdb.total_entries

Represents the total number of host entries currently in the HostDB lookup cache.

proxy.process.hostdb.total_hits

Represents the total number of origin server name resolutions which were satisfied by entries in the HostDB lookup cache, since statistics collection began.

proxy.process.hostdb.total_lookups

Represents the total number of origin server name resolutions which have been performed, since statistics collection began, regardless of whether they were satisfied by the HostDB lookup cache or required DNS lookups.

proxy.process.hostdb.ttl_expires

proxy.process.hostdb.ttl

proxy.process.hostdb.cache.current_items

The number of distinct host records in the HostDB cache.

proxy.process.hostdb.cache.current_size

The total size of all host records in the HostDB cache.

proxy.process.hostdb.cache.last_sync.time

The Unix timestamp of the last successful sync of HostDB’s cache to disk

proxy.process.hostdb.cache.last_sync.total_items

The number of distinct host records in the HostDB cache that where synced to disk.

proxy.process.hostdb.cache.last_sync.total_size

The total size of all host records in the HostDB cache that where synced to disk.

proxy.process.hostdb.cache.total_failed_inserts

The number of host records that where unable to be inserted into HostDB’s cache

proxy.process.hostdb.cache.total_hits

The total number of successful lookups for host records from HostDB’s cache

proxy.process.hostdb.cache.total_inserts

The number host records inserted into HostDB’s cache

proxy.process.hostdb.cache.total_lookups

The total number of lookups for host records from HostDB’s cache