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Posted to issues@hbase.apache.org by "Zheng Hu (JIRA)" <ji...@apache.org> on 2018/12/28 09:15:00 UTC
[jira] [Updated] (HBASE-21657)
PrivateCellUtil#estimatedSerializedSizeOf has been the bottleneck in 100%
scan case.
[ https://issues.apache.org/jira/browse/HBASE-21657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zheng Hu updated HBASE-21657:
-----------------------------
Description:
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.
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, but the
> 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
> 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 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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