Logs

This topic describes default log files locations as well as the types of available logs.

Default Log File Locations

By default, Dremio uses the following locations to write logs:

• Tarball - <DREMIO_HOME>/log
• RPM - /var/log/dremio

System logs

All the following logs are enabled by default:

server.out - Log for Dremio daemon standard out.

server.log - Server log.

access.log - HTTP access log for the Dremio web server. This log will be generated by coordinator nodes only.

server.gc - Garbage collection log.

Query logs

Query logs are located in the queries.json file. This file contains a log of completed queries; it does not include queries currently in planning or execution.

Query logging is enabled by default.

[info] Query logs can be queried by Dremio itself or another tool for monitoring and analytics.

Format

Query logs include the following information:

• queryId - Unique ID of the executed query.
• queryText- SQL query text.
• start - Start time of the query.
• finish - End time of the query.
• outcome - Whether the query was completed or failed.
• username - User that executed the query.
• commandDescription - Type of the command. This maybe a reqular SQL query execution job or another SQL command.

Sample Entries

// Successful Query
{"queryId":"260ec9bd-4f6f-ae2f-6ab2-3e8d6d3bc000",
"schema":"",
"queryText":"SELECT *\nFROM Samples.\"samples.dremio.com\".\"zips.json\" ",
"start":1508980290692,
"finish":1508980291883,
"outcome":"COMPLETED",
"username":"dremio",
"commandDescription":"execute; query"}

// Failed Query
{"queryId":"260ec9b4-c893-3b73-7c97-d58d04350f00",
"schema":"",
"queryText":"SELECT *2333\nFROM Samples.\"samples.dremio.com\".\"zips.json\" ",
"start":1508980298029,
"finish":1508980298061,
"outcome":"FAILED",
"username":"dremio",
"commandDescription":"<unknown>"}