Details
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Bug
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Resolution: Done
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Major - P3
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None
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3.2.9
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None
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None
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ALL
Description
After upgrading a replica set to 3.2.9, I am seeing:
- increased CPU usage on the two hosts that have SSD's
- increased CPU and IOWAIT on the host that has regular HDDs (in software RAID1, if it makes any difference)
The workload hasn't changed before/after the upgrade (about 40-60 inserts / 1-2 queries / 0 updates / 0 deletes – per second)
The configuration also hasn't changed, I've been running WiredTiger before as well.
The storage configuration is configured as follows:
storage:
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dbPath: /var/lib/mongodb
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directoryPerDB: true
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journal:
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enabled: true
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engine: "wiredTiger"
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wiredTiger:
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engineConfig:
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journalCompressor: zlib
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collectionConfig:
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blockCompressor: zlib
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indexConfig:
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prefixCompression: true
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I've attached diagnostic.data as requested and some munin charts that show the difference before/after.
Seemingly related issues:
Let me know if there's anything else I can do to help.
Attachments
Issue Links
- related to
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SERVER-25249 High I/O load in secondary nodes with WiredTiger engine (caused by journaling)
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- Closed
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SERVER-25700 Very high CPU usage
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- Closed
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