Aerospike TTL updates

Question

I am trying to update .put() into existing records in Aerospike using the python client.

I was excited to discover that you can actually put into existing records and not update the TTL as shown here (meta params): https://www.aerospike.com/apidocs/python/client.html?highlight=ttl#aerospike.Client.put . I used to do this by reading the TTL and then re-setting it on the new put.

However, I discovered that when you use the aerospike.TTL_DONT_UPDATE option, the TTL resets to the cold-start-evict-ttl that is set on the namespace. How do I avoid that and just maintain the previous TTL unchanged?

Crossposted to Aerospike forums: https://discuss.aerospike.com/t/aerospike-ttls-on-put/4993

Answer 1

Not posting sample code is to a 'bug report' the equivalent of not washing your hands after using the toilet. It also would help if you simply provided the version of your server and the version of your Python client.

ttl-test.py

from __future__ import print_function
import aerospike
import sys
from aerospike import exception as e
from time import sleep

config = { 'hosts': [ ('127.0.0.1', 3000) ] }

try:
    client = aerospike.client(config).connect()
except ex.ClientError as e:
    print("Error: {0} [{1}]".format(e.msg, e.code))
    sys.exit(1)

key = ('test', 'demo', 'foo')

try:
    # Write a record
    client.put(key, {
        'name': 'Hey Joe',
        'age': 66
        }, meta={'ttl': 4})
except ex.RecordError as e:
    print("Error: {0} [{1}]".format(e.msg, e.code))
client.put(key, {'z': 26}, meta={'ttl': aerospike.TTL_DONT_UPDATE})

try:
    (key, meta) = client.exists(key)
    print(meta)
except ex.RecordError as e:
    print("Error: {0} [{1}]".format(e.msg, e.code))

sleep(5)

try:
    (key, meta) = client.exists(key)
    print(meta)
except ex.RecordError as e:
    print("Error: {0} [{1}]".format(e.msg, e.code))

client.close()

And now to test it:

$ python ttl-test.py 
{'gen': 2, 'ttl': 4}
None

Seems to work. Note that I'm using a server version >= 3.10.1