InfluxDB: Upgrade to 0.10 considerations

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What should users of InfluxDB 0.8 or 0.9 consider before upgrading to InfluxDB 0.10+? Touches on schema, continuous queries, data export/import, and gives example workflows.

Datos y análisis

Upgrading to InﬂuxDB 0.10:
Things to Consider
Sean Beckett
Director of Support & Professional Services

• New Storage Engine, TSM
• New Continuous Query syntax
• New Clustering
What's New?
0.8 —> 0.10
• New Schema
• New API and endpoints
• No MERGEs
• Shard Spaces become Retention Policies
• Updated Query syntax
• Administrative queries replace Admin UI

• Clustering in InﬂuxDB 0.10 is
not backwards compatible
• Continuous Query syntax and
conﬁguration are different
Brief Mentions
https://github.com/inﬂuxdata/inﬂuxdb/blob/master/importer/README.md
https://docs.inﬂuxdata.com/inﬂuxdb/v0.9/concepts/08_vs_09/
https://docs.inﬂuxdata.com/inﬂuxdb/v0.10/concepts/09_vs_010/

TSM: Time Structured Merge-Tree
• Purpose-built
• Compression by design
• No "empty" space
• Read only what is needed

TSM: Best Practices - measurements
• Measurements are logical containers for series
• Measurements contain series with related ﬁeld sets
• No JOINs or MERGEs across measurements

TSM: Best Practices - tags
• Tags are indexed
• Tags in the WHERE clause are performant
• GROUP BY operates on tags
• Tag Cardinality matters!

TSM: Best Practices - ﬁelds
• Fields are not indexed
• Fields in the WHERE clause are much less performant
• Functions operate only on ﬁelds
• Field cardinality is irrelevant*
• Multiple ﬁelds per point is more performant

TSM: Best Practices - timestamps
• Timestamp precision is controlled at write time
• Lower precision uses less disk, faster writes and reads

Migration Tools
InﬂuxDB 0.8.9 - Export (endpoint)
InﬂuxDB 0.9+ - Import via CLI (./inﬂux)
InﬂuxDB 0.10+ - TSM conversion tool (./inﬂux_tsm)

Example Migration #1
Conditions:
• Downtime is irrelevant
• Converting from 0.9
• Not clustered

Example Migration #1
1. Stop trafﬁc to InﬂuxDB 0.9
2. Restart the process and wait for the WAL to ﬂush
3. Stop InﬂuxDB
4. Install 0.10.1 on top of 0.9
5. Run ./influx_tsm to convert shards
influx_tsm -parallel /var/lib/influxdb/data
6. Once complete, launch InﬂuxDB 0.10.1
7. Resume trafﬁc to InﬂuxDB

Example Migration #2
Conditions:
• Downtime is unacceptable
• Converting from 0.9
• Not clustered

Example Migration #2
1. Install 0.10.1 on top of 0.9 and restart
2. Copy "cold" B1/BZ1 shards to /tmp
3. Run ./influx_tsm to convert cold shards
influx_tsm -backup /tmp/influxdb_backup /tmp/data
4. Remove cold B1/BZ1 shards and replace with
converted TSM shards
5. Wait until current "hot" shards become "cold", repeat
steps 2-4 on newly cold shards

Example Migration #3
Conditions:
• Downtime is acceptable
• Converting from 0.8
• Not clustered

Example Migration #3
1. Stop trafﬁc to InﬂuxDB 0.8.x
2. Install InﬂuxDB 0.8.9 and restart
3. Run the Export tool
curl -o export.gz --compressed http://localhost:8086/
export/<db>/<shard_space>
4. Launch InﬂuxDB 0.10.1 on a new server
5. Use the CLI to import the exported data
influx -import -path=export.gz -compressed > failures
6. Update clients and dashboards for new API, etc.
7. Resume trafﬁc to InﬂuxDB 0.10.1

The Hard Stuff
• Fixing failed points in 0.8 import
• Migrating 0.8 queries where a column is treated as
both a tag and a ﬁeld
• Controlling series cardinality
• Updating the clients to avoid downtime
• Updating the dashboards to avoid downtime
• Controlling for performance changes

Questions
docs.inﬂuxdata.com
inﬂuxdb@googlegroups.com
support@inﬂuxdb.com

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1. Upgrading to InﬂuxDB 0.10: Things to Consider Sean Beckett Director of Support & Professional Services

2. • New Storage Engine, TSM • New Continuous Query syntax • New Clustering What's New? 0.8 —> 0.10 • New Schema • New API and endpoints • No MERGEs • Shard Spaces become Retention Policies • Updated Query syntax • Administrative queries replace Admin UI

3. • Clustering in InfluxDB 0.10 is not backwards compatible • Continuous Query syntax and configuration are different Brief Mentions https://github.com/influxdata/influxdb/blob/master/importer/README.md https://docs.influxdata.com/influxdb/v0.9/concepts/08_vs_09/ https://docs.influxdata.com/influxdb/v0.10/concepts/09_vs_010/

4. TSM: Time Structured Merge-Tree • Purpose-built • Compression by design • No "empty" space • Read only what is needed

5. TSM: Best Practices - measurements • Measurements are logical containers for series • Measurements contain series with related ﬁeld sets • No JOINs or MERGEs across measurements

6. TSM: Best Practices - tags • Tags are indexed • Tags in the WHERE clause are performant • GROUP BY operates on tags • Tag Cardinality matters!

7. TSM: Best Practices - fields • Fields are not indexed • Fields in the WHERE clause are much less performant • Functions operate only on fields • Field cardinality is irrelevant* • Multiple fields per point is more performant

8. TSM: Best Practices - timestamps • Timestamp precision is controlled at write time • Lower precision uses less disk, faster writes and reads

9. Migration Tools InfluxDB 0.8.9 - Export (endpoint) InfluxDB 0.9+ - Import via CLI (./influx) InfluxDB 0.10+ - TSM conversion tool (./influx_tsm)

10. Example Migration #1 Conditions: • Downtime is irrelevant • Converting from 0.9 • Not clustered

11. Example Migration #1 1. Stop traffic to InfluxDB 0.9 2. Restart the process and wait for the WAL to flush 3. Stop InfluxDB 4. Install 0.10.1 on top of 0.9 5. Run ./influx_tsm to convert shards influx_tsm -parallel /var/lib/influxdb/data 6. Once complete, launch InfluxDB 0.10.1 7. Resume traffic to InfluxDB

12. Example Migration #2 Conditions: • Downtime is unacceptable • Converting from 0.9 • Not clustered

13. Example Migration #2 1. Install 0.10.1 on top of 0.9 and restart 2. Copy "cold" B1/BZ1 shards to /tmp 3. Run ./influx_tsm to convert cold shards influx_tsm -backup /tmp/influxdb_backup /tmp/data 4. Remove cold B1/BZ1 shards and replace with converted TSM shards 5. Wait until current "hot" shards become "cold", repeat steps 2-4 on newly cold shards

14. Example Migration #3 Conditions: • Downtime is acceptable • Converting from 0.8 • Not clustered

15. Example Migration #3 1. Stop traffic to InfluxDB 0.8.x 2. Install InfluxDB 0.8.9 and restart 3. Run the Export tool curl -o export.gz --compressed http://localhost:8086/ export/<db>/<shard_space> 4. Launch InfluxDB 0.10.1 on a new server 5. Use the CLI to import the exported data influx -import -path=export.gz -compressed > failures 6. Update clients and dashboards for new API, etc. 7. Resume traffic to InfluxDB 0.10.1

16. The Hard Stuff • Fixing failed points in 0.8 import • Migrating 0.8 queries where a column is treated as both a tag and a ﬁeld • Controlling series cardinality • Updating the clients to avoid downtime • Updating the dashboards to avoid downtime • Controlling for performance changes

17. Questions docs.influxdata.com influxdb@googlegroups.com support@influxdb.com

InfluxDB: Upgrade to 0.10 considerations

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