As the log level name "DEBUG" suggested, these are debug messages, not
warnings.
Is there any reason made you believe that these messages are warnings?
On 23/05/2024 11:10, Isaeed Mohanna wrote:
Hi
I have a big table (~220GB reported by used space live by tablestats)
with time series data that uses TWCS with the following settings
compaction = {'class':
'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy',
'compaction_window_size': '7', 'compaction_window_unit': 'DAYS',
'max_threshold': '32', 'min_threshold': '4'}
The table does not have a TTL configured since we need the data, it
now has ~450 sstables, I have had this setup for several years and so
far I am satisfied with the performance, we mostly read\write data
from the previous several months. Requests for earlier data occur but
not in the quantities and performance is less critical then.
I have recently noticed reoccurring warning in the Cassandra log file
and I wanted to ask about their meaning and wither I need to do
something about it
DEBUG [CompactionExecutor:356242] 2024-05-23 09:01:59,655
TimeWindowCompactionStrategy.java:129 - TWCS skipping check for fully
expired SSTables
DEBUG [CompactionExecutor:356242] 2024-05-23 09:01:59,655
TimeWindowCompactionStrategy.java:129 - TWCS skipping check for fully
expired SSTables
DEBUG [CompactionExecutor:356243] 2024-05-23 09:02:59,655
TimeWindowCompactionStrategy.java:122 - TWCS expired check
sufficiently far in the past, checking for fully expired SSTables
DEBUG [CompactionExecutor:356243] 2024-05-23 09:02:59,658
TimeWindowCompactionStrategy.java:122 - TWCS expired check
sufficiently far in the past, checking for fully expired SSTables
DEBUG [CompactionExecutor:356242] 2024-05-23 09:03:59,655
TimeWindowCompactionStrategy.java:129 - TWCS skipping check for fully
expired SSTables
DEBUG [CompactionExecutor:356242] 2024-05-23 09:03:59,656
TimeWindowCompactionStrategy.java:129 - TWCS skipping check for fully
expired SSTables
DEBUG [CompactionExecutor:356245] 2024-05-23 09:05:00,490
TimeWindowCompactionStrategy.java:129 - TWCS skipping check for fully
expired SSTables
DEBUG [CompactionExecutor:356245] 2024-05-23 09:05:00,490
TimeWindowCompactionStrategy.java:129 - TWCS skipping check for fully
expired SSTables
DEBUG [CompactionExecutor:356244] 2024-05-23 09:06:00,490
TimeWindowCompactionStrategy.java:129 - TWCS skipping check for fully
expired SSTables
The debug messages above appear in one of my Cassandra nodes every
several minutes, I have a 4 node cluster with RF=3.
Is there anything I need to do about those messages or its safe to
ignore them
Thank you for the help
