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https://issues.apache.org/jira/browse/KYLIN-4190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16982330#comment-16982330
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ASF subversion and git services commented on KYLIN-4190:
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Commit 186894778d30b60bee6da93d69a8cd7c76ccef4f in kylin's branch
refs/heads/master from chuxiao
[ https://gitbox.apache.org/repos/asf?p=kylin.git;h=1868947 ]
KYLIN-4190 hiveproducer write() function throw exception because hive mertics
table location path prefix is different with defaut fs when hdfs uses
router-based federation
> hiveproducer write() function throw exception because hive mertics table
> location path prefix is different with defaut fs when hdfs uses router-based
> federation
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: KYLIN-4190
> URL: https://issues.apache.org/jira/browse/KYLIN-4190
> Project: Kylin
> Issue Type: Bug
> Components: Metrics
> Affects Versions: v3.0.0-alpha
> Reporter: chuxiao
> Priority: Critical
> Fix For: v3.0.0
>
> Attachments: KYLIN-4190.master.001.patch
>
>
> Our hdfs cluster uses router-based
> federation（[https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-hdfs-rbf/HDFSRouterFederation.html]).
> Opening the system cube configuration, hiveproducer write() function throw
> exception :
> {code:java}
> //代码占位符
> ERROR [metrics-blocking-reservoir-scheduler-0] hive.HiveReservoirReporter:119
> : Wrong FS:
> hdfs://DClusterNmg4/user/kylin/hive/hive_metrics_job_exception_qa/kday_date=2019-09-04,
> expected: hdfs://difed
> java.lang.IllegalArgumentException: Wrong FS:
> hdfs://DClusterNmg4/user/kylin/hive/hive_metrics_job_exception_qa/kday_date=2019-09-04,
> expected: hdfs://difed
> at org.apache.hadoop.fs.FileSystem.checkPath(FileSystem.java:717)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.getPathName(DistributedFileSystem.java:197)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.access$000(DistributedFileSystem.java:109)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$23.doCall(DistributedFileSystem.java:1390)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$23.doCall(DistributedFileSystem.java:1386)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1402)
> at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1494)
> at
> org.apache.kylin.metrics.lib.impl.hive.HiveProducer.write(HiveProducer.java:137)
> at
> org.apache.kylin.metrics.lib.impl.hive.HiveProducer.send(HiveProducer.java:122)
> at
> org.apache.kylin.metrics.lib.impl.hive.HiveReservoirReporter$HiveReservoirListener.onRecordUpdate(HiveReservoirReporter.java:117)
> at
> org.apache.kylin.metrics.lib.impl.BlockingReservoir.notifyListenerOfUpdatedRecord(BlockingReservoir.java:105)
> at
> org.apache.kylin.metrics.lib.impl.BlockingReservoir.onRecordUpdate(BlockingReservoir.java:93)
> at
> org.apache.kylin.metrics.lib.impl.BlockingReservoir.access$300(BlockingReservoir.java:33)
> at
> org.apache.kylin.metrics.lib.impl.BlockingReservoir$ReporterRunnable.run(BlockingReservoir.java:152)
> at java.lang.Thread.run(Thread.java:745)
> {code}
>
> This is because the default router namespace is hdfs://difed, and the actual
> federation namespaces are the hdfs://DClusterNmg4, the hdfs://DClusterNmg1,
> and the hdfs://DClusterNmg2...
> So fs.defaultFS in core-sie.xml is hdfs ://difed, But this hive table
> location path is hdfs://DClusterNmg4/user/... . Then
> defaultFs.exists(hiveLocationPath) throw exception.
> So we need to check if the prefix is same. If defaut fs is not a prefix of
> hive table location path, use location path get a new filesystem
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