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https://issues.apache.org/jira/browse/KNOX-784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16683960#comment-16683960
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Kevin Risden commented on KNOX-784:
-----------------------------------
Took a look at this and the issue is that the connection manager isn't exposed
enough to customize it. I have an example where it is possible to now customize
the connection manager. This should help address the issue of KNOX-921 and not
setting the correct values on the connection manager. I think the issue from
this ticket is due to instantiating the httpclient multiple times or at least
the connection manager multiple times. We should create it once and then reuse
it.
> java.lang.IllegalArgumentException: A metric named
> org.apache.http.conn.HttpClientConnectionManager.available-connections
> already exists
> -----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: KNOX-784
> URL: https://issues.apache.org/jira/browse/KNOX-784
> Project: Apache Knox
> Issue Type: Bug
> Reporter: Nishant Bangarwa
> Assignee: Kevin Risden
> Priority: Major
> Fix For: 1.3.0
>
>
> Facing this error on latest trunk version -
> {code:java}
> Caused by: java.lang.IllegalArgumentException: A metric named
> org.apache.http.conn.HttpClientConnectionManager.available-connections
> already exists
> at com.codahale.metrics.MetricRegistry.register(MetricRegistry.java:91)
> at
> com.codahale.metrics.httpclient.InstrumentedHttpClientConnectionManager.<init>(InstrumentedHttpClientConnectionManager.java:63)
> at
> com.codahale.metrics.httpclient.InstrumentedHttpClientConnectionManager.<init>(InstrumentedHttpClientConnectionManager.java:49)
> at
> com.codahale.metrics.httpclient.InstrumentedHttpClientConnectionManager.<init>(InstrumentedHttpClientConnectionManager.java:41)
> at
> com.codahale.metrics.httpclient.InstrumentedHttpClientConnectionManager.<init>(InstrumentedHttpClientConnectionManager.java:36)
> at
> org.apache.hadoop.gateway.services.metrics.impl.instr.InstrHttpClientBuilderProvider.getInstrumented(InstrHttpClientBuilderProvider.java:41)
> at
> org.apache.hadoop.gateway.services.metrics.impl.instr.InstrHttpClientBuilderProvider.getInstrumented(InstrHttpClientBuilderProvider.java:36)
> at
> org.apache.hadoop.gateway.services.metrics.impl.DefaultMetricsService.getInstrumented(DefaultMetricsService.java:128)
> at
> org.apache.hadoop.gateway.dispatch.DefaultHttpClientFactory.createHttpClient(DefaultHttpClientFactory.java:67)
> at
> org.apache.hadoop.gateway.dispatch.GatewayDispatchFilter.init(GatewayDispatchFilter.java:75)
> at
> org.apache.hadoop.gateway.GatewayFilter$Holder.getInstance(GatewayFilter.java:362){code}
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