[ https://issues.apache.org/jira/browse/STORM-2838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ethan Li closed STORM-2838. --------------------------- 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)