Jason Gerlowski created SOLR-14566:
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Summary: Record "NOW" on "coordinator" log messages
Key: SOLR-14566
URL: https://issues.apache.org/jira/browse/SOLR-14566
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Jason Gerlowski
Assignee: Jason Gerlowski
Currently, in SolrCore.java we log each search request that comes through each
core as it is finishing. This includes the path, query-params, QTime, and
status. In the case of a distributed search both the "coordinator" node and
each of the per-shard requests produce a log message.
When Solr is fielding many identical queries, such as those created by a
healthcheck or dashboard, it can be hard when examining logs to link the
per-shard requests with the "cooordinator" request that came in upstream.
One thing that would make this easier is if the {{NOW}} param added to
per-shard requests is also included in the log message from the "coordinator".
While {{NOW}} isn't unique strictly speaking, it often is in practice, and
along with the query-params would allow debuggers to associate shard requests
with coordinator requests a large majority of the time.
An alternative approach would be to create a {{qid}} or {{query-uuid}} when the
coordinator starts its work that can be logged everywhere. This provides a
stronger expectation around uniqueness, but would require UUID generation on
the coordinator, which may be non-negligible work at high QPS (maybe? I have no
idea). It also loses the neatness of reusing data already present on the shard
requests.
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