Details
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Type:
Bug
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Status:
Open
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Priority:
Major
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Resolution: Unresolved
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Affects Version/s: 2.1
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Fix Version/s: .next
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Component/s: couchbase-bucket
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Security Level: Public
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Labels:None
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Environment:2.0.1 enterprise edition (build-144) on Centos
Description
3 node cluster, 4 cores, 8G RAM for each node. The disk is 30G HHD.
Create a default bucket with 3.5G RAM.
Initial Load 35M items to make the cluster into 75% resident ratio and when access the data the workload definition is:
create:10, update:30, get:50, delete:10,ops per sec:30000
When many background fetches happen, cache miss around 5%~10%, contention to the disk write queue between threads make the draining rate drop significantly and choppy.
Create a default bucket with 3.5G RAM.
Initial Load 35M items to make the cluster into 75% resident ratio and when access the data the workload definition is:
create:10, update:30, get:50, delete:10,ops per sec:30000
When many background fetches happen, cache miss around 5%~10%, contention to the disk write queue between threads make the draining rate drop significantly and choppy.
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This issue should be investigated as part of our effort to enhance the disk write performance.
It seems to me that there is a high contention between bg fetcher and flusher in case of a high cache miss ratio (5%)