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https://issues.apache.org/jira/browse/HBASE-21657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zheng Hu updated HBASE-21657:
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Description:
We are evaluating the performance of branch-2, and find that the throughput of
scan in SSD cluster is almost the same as HDD cluster. so I made a FlameGraph
on RS, and found that the PrivateCellUtil#estimatedSerializedSizeOf cost about
29% cpu, Obviously, it has been the bottleneck in 100% scan case.
See the [^hbase20-ssd-100-scan-traces.svg]
BTW, in our XiaoMi branch, we introduce a
HRegion#updateReadRequestsByCapacityUnitPerSecond to sum up the size of cells
(for metric monitor), so it seems the performance loss was amplified.
was:
We are evaluating the performance of branch-2, and find that the throughput in
SSD cluster is almost the same as HDD cluster. so I made a FlameGraph on RS,
and found that the PrivateCellUtil#estimatedSerializedSizeOf cost about 29%
cpu, Obviously, it has been the bottleneck in 100% scan case.
See the [^hbase20-ssd-100-scan-traces.svg]
BTW, in our XiaoMi branch, we introduce a
HRegion#updateReadRequestsByCapacityUnitPerSecond to sum up the size of cells
(for metric monitor), so it seems the performance loss was amplified.
> PrivateCellUtil#estimatedSerializedSizeOf has been the bottleneck in 100%
> scan case.
> ------------------------------------------------------------------------------------
>
> Key: HBASE-21657
> URL: https://issues.apache.org/jira/browse/HBASE-21657
> Project: HBase
> Issue Type: Bug
> Components: Performance
> Reporter: Zheng Hu
> Assignee: Zheng Hu
> Priority: Major
> Attachments: hbase20-ssd-100-scan-traces.svg
>
>
> We are evaluating the performance of branch-2, and find that the throughput
> of scan in SSD cluster is almost the same as HDD cluster. so I made a
> FlameGraph on RS, and found that the
> PrivateCellUtil#estimatedSerializedSizeOf cost about 29% cpu, Obviously, it
> has been the bottleneck in 100% scan case.
> See the [^hbase20-ssd-100-scan-traces.svg]
> BTW, in our XiaoMi branch, we introduce a
> HRegion#updateReadRequestsByCapacityUnitPerSecond to sum up the size of cells
> (for metric monitor), so it seems the performance loss was amplified.
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