some data missing after server restart

[gacha]

Hi,

so I create a TS list TS.CREATE temp and then with a script I insert each 5 minutes a reading (0..30) for one year - 105120 in total. I insert the same data in a sorted set ztemp. The result is as follows:

127.0.0.1:6379> TS.INFO temp
 1) lastTimestamp
 2) (integer) 1544309769
 3) retentionSecs
 4) (integer) 0
 5) chunkCount
 6) (integer) 292
 7) maxSamplesPerChunk
 8) (integer) 360
 9) rules
10) (empty list or set)
127.0.0.1:6379> ZCARD ztemp
(integer) 105120
127.0.0.1:6379> DEBUG OBJECT temp
Value at:0x7fa72d066730 refcount:1 encoding:raw serializedlength:1576823 lru:806228 lru_seconds_idle:71
127.0.0.1:6379> DEBUG OBJECT ztemp
Value at:0x7fa72d066720 refcount:1 encoding:skiplist serializedlength:5746654 lru:806255 lru_seconds_idle:48

then I save the db SAVE and restart the server. After that the result is as follows:

127.0.0.1:6379> TS.INFO temp
 1) lastTimestamp
 2) (integer) 1544309769
 3) retentionSecs
 4) (integer) 0
 5) chunkCount
 6) (integer) 8
 7) maxSamplesPerChunk
 8) (integer) 360
 9) rules
10) (empty list or set)
127.0.0.1:6379> ZCARD ztemp
(integer) 105120
127.0.0.1:6379> DEBUG OBJECT temp
Value at:0x7f899ac66840 refcount:1 encoding:raw serializedlength:43220 lru:806313 lru_seconds_idle:13
127.0.0.1:6379> DEBUG OBJECT ztemp
Value at:0x7f899ac66730 refcount:1 encoding:skiplist serializedlength:5746654 lru:806313 lru_seconds_idle:6

After restart the temp list has only 8 chunks and the serialized length is very small. The ztemp has the same size as before restart.

My redis server information:

redis-server -v
Redis server v=5.0.2 sha=00000000:0 malloc=jemalloc-5.1.0 bits=64 build=d7cfa2a01a7adee9

loadmodule /home/gatis/Apps/redis/redis-tsdb-module.so
dir /home/gatis/Apps/redis/db
logfile /home/gatis/Apps/redis/redis.log
loglevel debug

[gacha]

I tested the same on a different machine and the problem was the same, just the chunkCount was 6. Is this normal behavior or I misunderstood something?

[danni-m]

@gacha looks like a bug, the following is the expected behivor:

1. have x samples in ztemp
2. save
3. restart
4. read ztemp -> expected is x samples

[danni-m]

@gacha I fixed the issue in the labels branch. im planning on merging it soon (need to finish documentation).

[gacha]

Tested the labels branch and now TS.INFO shows the same before and after save&restart.

Thanks.