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https://issues.apache.org/jira/browse/ATLAS-5325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nixon Rodrigues resolved ATLAS-5325.
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Fix Version/s: 3.0.0
2.6.0
Resolution: Fixed
Merged on master and atlas-2.6 branch.
> Atlas startup failure in embedded-hbase-solr profile due to conflicting HBase
> shaded MapReduce dependency
> ---------------------------------------------------------------------------------------------------------
>
> Key: ATLAS-5325
> URL: https://issues.apache.org/jira/browse/ATLAS-5325
> Project: Atlas
> Issue Type: Bug
> Affects Versions: trunk
> Reporter: Nixon Rodrigues
> Assignee: Paresh Devalia
> Priority: Major
> Fix For: 3.0.0, 2.6.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Problem Statement
> Apache Atlas packaged using the embedded-hbase-solr profile fails to start
> during initialization with the following exception:
> java.lang.NoSuchMethodError:
> org.apache.hadoop.hbase.zookeeper.ZKConfig.getZKClientConfig(
> Lorg/apache/hadoop/conf/Configuration;
> )Lorg/apache/zookeeper/client/ZKClientConfig;
> As a result, Atlas is unable to establish connectivity with HBase and startup
> fails.
> Environment
> * Apache Atlas built using embedded-hbase-solr profile
> * Embedded HBase
> * Embedded Solr
> * HBase 2.6.4 based runtime
> Root Cause Analysis (RCA)
> Investigation revealed a classpath conflict involving HBase shaded
> dependencies packaged in the Atlas runtime distribution.
> The runtime classpath contains:
> hbase-shaded-mapreduce-2.6.4-hadoop3.jar
> This artifact includes HBase classes whose method signatures differ from
> those expected by the HBase client libraries used by Atlas.
> Specifically, during initialization of HBase's ZKConnectionRegistry, Atlas
> invokes:
> org.apache.hadoop.hbase.zookeeper.ZKConfig.getZKClientConfig(Configuration)
> However, the version of ZKConfig resolved at runtime exposes an incompatible
> method signature, resulting in:
> java.lang.NoSuchMethodError
> The exception occurs during creation of ReadOnlyZKClient and prevents Atlas
> from completing startup.
> Evidence
> Bytecode inspection confirmed that the ZKConfig class packaged through the
> shaded MapReduce dependency exposes a different API signature than the one
> expected by Atlas runtime components.
> Removing the conflicting dependency eliminates the NoSuchMethodError and
> allows Atlas startup to proceed successfully.
> Workaround
> Remove the following jar from the Atlas runtime classpath:
> hbase-shaded-mapreduce-2.6.4-hadoop3.jar
> Example:
> mv server/webapp/atlas/WEB-INF/lib/hbase-shaded-mapreduce-2.6.4-hadoop3.jar
> /tmp/
> After removing this dependency and restarting Atlas:
> * Embedded HBase starts successfully
> * Embedded Solr starts successfully
> * Atlas initializes successfully
> * Atlas UI becomes accessible
>
> *Resolution*
> Atlas startup failure was caused by a runtime classpath conflict introduced
> by hbase-shaded-mapreduce-2.6.4-hadoop3.jar packaged in the
> embedded-hbase-solr distribution. Removing the jar resolves the issue and
> allows Atlas to start successfully.
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