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https://issues.apache.org/jira/browse/STORM-2838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ethan Li closed STORM-2838.
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Resolution: Won't Fix
> Replace log4j-over-slf4j with log4j-1.2-api
> -------------------------------------------
>
> Key: STORM-2838
> URL: https://issues.apache.org/jira/browse/STORM-2838
> Project: Apache Storm
> Issue Type: Improvement
> Reporter: Ethan Li
> Assignee: Ethan Li
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> I tried to setup HdfsBlobStore and an exception shows up when I launch the
> nimbus.
> {code:java}
> Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class path,
> preempting StackOverflowError.
> {code}
> Found an explanation: https://www.slf4j.org/codes.html#log4jDelegationLoop
> This is because storm and hadoop use different logging system:
> {code:java}
> Storm: log4j-over-slf4j --> slf4j --> log4j2 or slf4j --> log4j2
> Hadoop: slf4j --> log4j1.2 or log4j1.2
> (note: --> means redirecting)
> {code}
> When we add hadoop common lib classpath to nimbus, log4j-over-slf4j.jar and
> slf4j-log4j12.jar coexist.
> One way to let storm work with hadoop is to replace log4j-over-slf4j in storm
> with log4j1.2.
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