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downscales when consumed 0 and allow-scaling-down-reads-on-0-percent: false #294

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abiacco opened this issue Apr 25, 2016 · 4 comments
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@abiacco
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abiacco commented Apr 25, 2016

I'm testing this script out for the first time and it seems to want to downscale a table even if consumed is 0.
Even tried with increase-consumed-reads-scale: {0: 0}. Same result.
Any help is appreciated.

CONFIG
[global]

[logging]
log-level: debug
log-file: /var/log/dynamic-dynamodb.log

[default_options]
enable-reads-up-scaling: true
enable-reads-down-scaling: true
increase-reads-unit: percent
decrease-reads-unit: percent
min-provisioned-reads: 1
max-provisioned-reads: 500
allow-scaling-down-reads-on-0-percent: false
enable-writes-up-scaling: true
enable-writes-down-scaling: true
increase-writes-unit: percent
decrease-writes-unit: percent
min-provisioned-writes: 1
max-provisioned-writes: 500
allow-scaling-down-writes-on-0-percent: false
[table: ^test$]

LOG
2016-04-25 11:18:51,335 - dynamic-dynamodb - DEBUG - test - Currently provisioned read units: 15
2016-04-25 11:18:51,335 - dynamic-dynamodb - INFO - test - Consumed read units: 0.00%
2016-04-25 11:18:51,362 - dynamic-dynamodb - DEBUG - test - Currently provisioned write units: 15
2016-04-25 11:18:51,362 - dynamic-dynamodb - INFO - test - Consumed write units: 0.00%
2016-04-25 11:18:51,362 - dynamic-dynamodb - DEBUG - test - Throughput alarm thresholds not crossed
2016-04-25 11:18:51,378 - dynamic-dynamodb - DEBUG - test - Currently provisioned read units: 15
2016-04-25 11:18:51,413 - dynamic-dynamodb - DEBUG - test - Currently provisioned read units: 15
2016-04-25 11:18:51,413 - dynamic-dynamodb - INFO - test - Consumed read units: 0.00%
2016-04-25 11:18:51,427 - dynamic-dynamodb - INFO - test - Read throttle count: 0
2016-04-25 11:18:51,454 - dynamic-dynamodb - DEBUG - test - Currently provisioned read units: 15
2016-04-25 11:18:51,454 - dynamic-dynamodb - INFO - test - Throttled read percent by provision: 0.00%
2016-04-25 11:18:51,580 - dynamic-dynamodb - INFO - test - Throttled read percent by consumption: 0.00%
2016-04-25 11:18:51,581 - dynamic-dynamodb - INFO - test - Scaling down reads is not done when usage is at 0%
2016-04-25 11:18:51,581 - dynamic-dynamodb - DEBUG - test - Setting min provisioned reads to 1
2016-04-25 11:18:51,581 - dynamic-dynamodb - DEBUG - test - Read provisioning will be decreased to 8 units
2016-04-25 11:18:51,581 - dynamic-dynamodb - INFO - test - Consecutive read checks 1/1
2016-04-25 11:18:51,601 - dynamic-dynamodb - DEBUG - test - Currently provisioned write units: 15
2016-04-25 11:18:51,628 - dynamic-dynamodb - DEBUG - test - Currently provisioned write units: 15
2016-04-25 11:18:51,628 - dynamic-dynamodb - INFO - test - Consumed write units: 0.00%
2016-04-25 11:18:51,642 - dynamic-dynamodb - INFO - test - Write throttle count: 0
2016-04-25 11:18:51,674 - dynamic-dynamodb - DEBUG - test - Currently provisioned write units: 15
2016-04-25 11:18:51,675 - dynamic-dynamodb - INFO - test - Throttled write percent by provision: 0.00%
2016-04-25 11:18:51,694 - dynamic-dynamodb - INFO - test - Throttled write percent by consumption: 0.00%
2016-04-25 11:18:51,694 - dynamic-dynamodb - INFO - test - Scaling down writes is not done when usage is at 0%
2016-04-25 11:18:51,694 - dynamic-dynamodb - DEBUG - test - Setting min provisioned writes to 1
2016-04-25 11:18:51,694 - dynamic-dynamodb - DEBUG - test - Write provisioning will be decreased to 8 units
2016-04-25 11:18:51,694 - dynamic-dynamodb - INFO - test - Consecutive write checks 1/1
2016-04-25 11:18:51,694 - dynamic-dynamodb - INFO - test - Changing provisioning to 8 read units and 8 write units
2016-04-25 11:18:51,708 - dynamic-dynamodb - DEBUG - test - Currently provisioned read units: 15
2016-04-25 11:18:51,725 - dynamic-dynamodb - DEBUG - test - Currently provisioned write units: 15
2016-04-25 11:18:51,746 - dynamic-dynamodb - DEBUG - test - Table status is ACTIVE
2016-04-25 11:18:51,768 - dynamic-dynamodb - DEBUG - test - Currently provisioned read units: 15
2016-04-25 11:18:51,790 - dynamic-dynamodb - DEBUG - test - Currently provisioned write units: 15
2016-04-25 11:18:51,790 - dynamic-dynamodb - INFO - test - Updating provisioning to 8 reads and 8 writes

@ckrajk
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ckrajk commented May 18, 2016

Same issue here, going to use these properties as a workaround,
num-read-checks-before-scale-down and min-provisioned-reads

@amalnanavati
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+1 same issue here

amalnanavati pushed a commit to amalnanavati/dynamic-dynamodb that referenced this issue Jun 10, 2016
Fixed the allow-scaling-down-on-0-percent bug.  Earlier, if consumed
== 0, it used to print that it won't scale down but then scale down
anyway (sebdah#294).  Now, it
won't scale down if consumed == 0 and that option is set to false.
@carlosgarbiatti
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+1 same issue here

@mchhatani
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mchhatani commented Nov 7, 2016

Same issue below are the configuration, even if the consumed-capacity is 0, capacity for the table and GSI is not reduced

[logging]
log-level: debug

log-file: /var/lib/pgsql/dynamic-dynamodb/log/dynamic-dynamodb-dev.log

[table: dev-WriteServices-CustomerEngagement-v2]
reads-upper-alarm-threshold: 75
reads-lower-alarm-threshold: 25
reads-upper-threshold: 80
reads-lower-threshold: 20
increase-reads-with: 25
decrease-reads-with: 25
increase-reads-unit: percent
decrease-reads-unit: percent
min-provisioned-reads: 5
max-provisioned-reads: 300
enable-reads-up-scaling: true
enable-reads-down-scaling: true
num-read-checks-before-scale-down: 1

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