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# generals
Slackbot
01/20/2023, 4:38 PMThis message was deleted.
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Renato Santos
01/20/2023, 4:39 PMI have a issue when I load all segments, the historicals crash due to low-memory
I don't have an ideia of how much memory each segments needs, usually I'm running with about ~ 5k segments in 3 servers, this runs fine with 512mb XMS, If i change to 3GB I can load 12k without crashing, but I have no ideia what I should set to be safe
Renato Santos
01/20/2023, 4:41 PMI think MQS have a plan to run queryes direcly on the S3 right? is it ready? I just need some ad-hoc issues
Renato Santos
01/20/2023, 4:42 PMalso, It would be nice to be able to run compaction jobs on the unloaded segments - this would be great for compacting late messages that arrive many days after the retention
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Ben Krug
01/20/2023, 9:13 PMSee the threads just above. The metadata database might have the numbers you want, about used and unused segments.