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https://issues.apache.org/jira/browse/KNOX-2954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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liang.feng updated KNOX-2954:
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Summary: Gateway service metric name contain hbase rowkey led to frequently
full gc (was: Gateway name of service metric contain hbase rowkey led to
frequently full gc)
> Gateway service metric name contain hbase rowkey led to frequently full gc
> --------------------------------------------------------------------------
>
> Key: KNOX-2954
> URL: https://issues.apache.org/jira/browse/KNOX-2954
> Project: Apache Knox
> Issue Type: Bug
> Components: Metrics, Server
> Reporter: liang.feng
> Priority: Critical
> Attachments: image-2023-09-01-16-40-35-876.png,
> image-2023-09-01-16-49-57-346.png, image-2023-09-01-16-55-30-378.png,
> image-2023-09-01-17-37-51-597.png, mat_heap_leak_suspects_result.png
>
>
> Our Gateway Server frequently full gc in a few days. I dumped jvm heap and
> analyzed dump file with mat tool. I found some leak suspects about jmx
> metric, These leaks occurs in class
> org.apache.knox.gateway.services.metrics.impl.DefaultMetricsService.
> This is the analysis result generated by MAT
> !mat_heap_leak_suspects_result.png!
>
> This is detail of problem Suspect 3
> !image-2023-09-01-16-40-35-876.png!
>
> I found that many metrics which starting with service contain hbase rowkey by
> using visualVM tool. These metrics were generted when I used get api to query
> data from hbase. I think that name of service metric should not contain
> rowkey.
>
> This is an example of metric name
> !image-2023-09-01-16-55-30-378.png!
>
> The reason for this problem is that client and service metric both call the
> InstrUtils.getServiceResourcePath function to get resource path , but the
> parameters they use are different when build metric name. Suppose the request
> url is [https://localhost:8443/gateway/sandbox/hbase/demo/row9.
> |https://bd-hbase-dev02.zeus.lianjia.com:8443/gateway/sandbox/hbase/demo/row9]When
> building a client metric name, the parameter of the calling
> InstrUtils.getServiceResourcePath function is
> httpServletRequest.getPathInfo(), its value is /hbase/demo/row9. When
> building a service metric name, the parameter of the calling
> InstrUtils.getServiceResourcePath function is RequestLine.getUri(), its value
> is /demo/row9. The purpose of InstrUtils.getServiceResourcePath is to obtain
> the first two elements of path. So service metric name contains rowkey.
> I think that we should only obtain the first elements of path, when building
> service metric name.
> The effect after applying the [pr791|https://github.com/apache/knox/pull/791]
> !image-2023-09-01-17-37-51-597.png!
>
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