Hi, 
As per prometheus documentation, "Compaction will create larger blocks 
containing data spanning up to 10% of the retention time, or 31 days, 
whichever is smaller."

We have set retention time as 4 days. 10% of retention time is 9.6h. If we 
align to the 2 hour boundary then it will become 8 hr. But  prometheus is 
creating bigger blocks only upto 6 hour. Could you please let us know how 
it is calculated.

Following is differnt test which we did with different retention time(10m, 
1d, 2d, 3d, 4d, 7d, 15d). Please note retention size is not set. 

fifteen-day-cpro-server-0
total 60
drwxrws---. 2 root  65534 16384 Jun  7 06:07 lost+found
-rw-r--r--. 1 65534 65534     0 Jun  7 06:08 lock
drwxr-sr-x. 3 65534 65534  4096 Jun  7 17:00 01G4ZHR5XPZW1SJ7ZSDKEA8GWG
drwxr-sr-x. 3 65534 65534  4096 Jun  8 09:00 01G518P9M546ZMG7PC6XC435KQ
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X8RBDRNCFK0ZX389R1WCG
drwxr-sr-x. 2 65534 65534  4096 Jun  8 15:00 chunks_head
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 wal
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X914XWP2ZYXQ5JBCQTWR5
-rw-r--r--. 1 65534 65534 20001 Jun  8 15:06 queries.active
four-day-cpro-server-0
total 68
drwxrws---. 2 root  65534 16384 Jun  7 06:07 lost+found
-rw-r--r--. 1 65534 65534     0 Jun  7 06:09 lock
drwxr-sr-x. 3 65534 65534  4096 Jun  7 17:00 01G4ZHR4TKCW31TX7A988YXEH1
drwxr-sr-x. 3 65534 65534  4096 Jun  7 21:00 01G4ZZFG1S11VXXJENB17B1QZY
drwxr-sr-x. 3 65534 65534  4096 Jun  8 03:00 01G50M2KBZ4Q5QDKFQT5C5APZ9
drwxr-sr-x. 3 65534 65534  4096 Jun  8 09:00 01G518NVEEQ58VNCY9YA2Q03SE
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X8QDYBJA81XWS9TSB6BDQ
drwxr-sr-x. 2 65534 65534  4096 Jun  8 15:00 chunks_head
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 wal
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X8ZWY7H9AWDE9SVH2CP5N
-rw-r--r--. 1 65534 65534 20001 Jun  8 15:06 queries.active
one-day-cpro-server-0
total 96
drwxrws---. 2 root  65534 16384 Jun  7 06:08 lost+found
-rw-r--r--. 1 65534 65534     0 Jun  7 06:09 lock
drwxr-sr-x. 3 65534 65534  4096 Jun  7 15:00 01G4ZAW0WNFYMP5JK9K12XJ5Q3
drwxr-sr-x. 3 65534 65534  4096 Jun  7 17:00 01G4ZHQR4N49YYM33NMT2NJCM8
drwxr-sr-x. 3 65534 65534  4096 Jun  7 19:00 01G4ZRKFCMFPP15V6VBV5DNQQC
drwxr-sr-x. 3 65534 65534  4096 Jun  7 21:00 01G4ZZF6MS3JEF8B8K8CRA1G3X
drwxr-sr-x. 3 65534 65534  4096 Jun  7 23:00 01G506AXWP0R72GCFWRQTNHWHV
drwxr-sr-x. 3 65534 65534  4096 Jun  8 01:00 01G50D6N4NMA9VNVZKWB2W8G4Q
drwxr-sr-x. 3 65534 65534  4096 Jun  8 03:00 01G50M2CDG33SSXC5MH04HXF36
drwxr-sr-x. 3 65534 65534  4096 Jun  8 05:00 01G50TY3MQV7Z5A5T3Z00FWR4M
drwxr-sr-x. 3 65534 65534  4096 Jun  8 07:00 01G511STWNM6QFD7CJ4NDKE3ZZ
drwxr-sr-x. 3 65534 65534  4096 Jun  8 09:00 01G518NJ4NVWF5VYFBX170B74Z
drwxr-sr-x. 3 65534 65534  4096 Jun  8 11:00 01G51FH8Z4KH8P30EQC776WKMY
drwxr-sr-x. 3 65534 65534  4096 Jun  8 13:00 01G51PD0MNAM4YEYAV5HBXC68M
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X8QWNW7K0RG5WPEPA6J75
drwxr-sr-x. 2 65534 65534  4096 Jun  8 15:00 chunks_head
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 wal
-rw-r--r--. 1 65534 65534 20001 Jun  8 15:07 queries.active
seven-day-cpro-server-0
total 68
drwxrws---. 2 root  65534 16384 Jun  7 06:07 lost+found
-rw-r--r--. 1 65534 65534     0 Jun  7 06:09 lock
drwxr-sr-x. 3 65534 65534  4096 Jun  7 17:00 01G4ZHR3TQTJ3XRZRZQRQF3YNY
drwxr-sr-x. 3 65534 65534  4096 Jun  7 21:00 01G4ZZFH68NEQJK6T2F3F2XC3Y
drwxr-sr-x. 3 65534 65534  4096 Jun  8 03:00 01G50M2KW3JRK2J7H0TZ0WGYGK
drwxr-sr-x. 3 65534 65534  4096 Jun  8 09:00 01G518NWQ2QX42XAYP46H31D92
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X8R6V0FVSNKQ8KTBXSANS
drwxr-sr-x. 2 65534 65534  4096 Jun  8 15:00 chunks_head
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 wal
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X9056BT7YJEZBJZMSAEVV
-rw-r--r--. 1 65534 65534 20001 Jun  8 15:07 queries.active
ten-min-cpro-server-0
total 48
drwxrws---. 2 root  65534 16384 Jun  7 06:07 lost+found
-rw-rw-r--. 1 65534 65534     0 Jun  7 06:09 lock
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X8QJ2E6E92KDB8CX8FNWY
drwxrwsr-x. 2 65534 65534  4096 Jun  8 15:00 chunks_head
drwxrwsr-x. 3 65534 65534  4096 Jun  8 15:00 wal
-rw-rw-r--. 1 65534 65534 20001 Jun  8 15:07 queries.active
three-day-cpro-server-0
total 68
drwxrws---. 2 root  65534 16384 Jun  7 06:07 lost+found
-rw-r--r--. 1 65534 65534     0 Jun  7 06:09 lock
drwxr-sr-x. 3 65534 65534  4096 Jun  7 17:00 01G4ZHR5PE5E5W0G8Y3KZHGZ59
drwxr-sr-x. 3 65534 65534  4096 Jun  7 21:00 01G4ZZFJ9K8HBW0S9AXT07PTS0
drwxr-sr-x. 3 65534 65534  4096 Jun  8 03:00 01G50M2K3PQHG1XFRKZS9HWCST
drwxr-sr-x. 3 65534 65534  4096 Jun  8 09:00 01G518NVSZ5GKFCPYX4VK8ES5S
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X8RBJQ68P709CMNKWHTSH
drwxr-sr-x. 2 65534 65534  4096 Jun  8 15:00 chunks_head
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 wal
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X90VJ543W770RJQM7D81W
-rw-r--r--. 1 65534 65534 20001 Jun  8 15:07 queries.active
two-day-cpro-server-0
total 108
drwxrws---. 2 root  65534 16384 Jun  7 06:08 lost+found
-rw-r--r--. 1 65534 65534     0 Jun  7 06:09 lock
drwxr-sr-x. 3 65534 65534  4096 Jun  7 09:09 01G4YPT28KE1ERW4K43AXWGYWM
drwxr-sr-x. 3 65534 65534  4096 Jun  7 11:00 01G4YX4HY0JZC3RFAHEQYNNQ31
drwxr-sr-x. 3 65534 65534  4096 Jun  7 13:00 01G4Z40961X9HKT4WMHSSSXBN4
drwxr-sr-x. 3 65534 65534  4096 Jun  7 15:00 01G4ZAW0E0YVYQJEHNNC7JZTR4
drwxr-sr-x. 3 65534 65534  4096 Jun  7 17:00 01G4ZHQQP0W8DAZA3JRXAFPAQQ
drwxr-sr-x. 3 65534 65534  4096 Jun  7 19:00 01G4ZRKEY00KXCMX9X7SG7F5VR
drwxr-sr-x. 3 65534 65534  4096 Jun  7 21:00 01G4ZZF661NZV15S1DFKAFMMXY
drwxr-sr-x. 3 65534 65534  4096 Jun  7 23:00 01G506AXE1H9WXG1E4F6ARF6B2
drwxr-sr-x. 3 65534 65534  4096 Jun  8 01:00 01G50D6MP0FRJ8BEHMSB0SQEN0
drwxr-sr-x. 3 65534 65534  4096 Jun  8 03:00 01G50M2BY0N3MB37W5MR1NPWPT
drwxr-sr-x. 3 65534 65534  4096 Jun  8 05:00 01G50TY361R94D1SSD9GGWCNMP
drwxr-sr-x. 3 65534 65534  4096 Jun  8 07:00 01G511STE11YHBY842MG04T2T5
drwxr-sr-x. 3 65534 65534  4096 Jun  8 09:00 01G518NHP1M4GM2J340CYM97F9
drwxr-sr-x. 3 65534 65534  4096 Jun  8 11:00 01G51FH8Y0JTPDC3F0Q86JFWST
drwxr-sr-x. 3 65534 65534  4096 Jun  8 13:00 01G51PD060XKRD1GY3G1W149TJ
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 01G51X8QE1HTTVCDNJVEH4JYZC
drwxr-sr-x. 2 65534 65534  4096 Jun  8 15:00 chunks_head
drwxr-sr-x. 3 65534 65534  4096 Jun  8 15:00 wal
-rw-r--r--. 1 65534 65534 20001 Jun  8 15:07 queries.active





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