[jira] [Resolved] (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

["nichunen (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KYLIN-4190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

nichunen resolved KYLIN-4190.
-----------------------------
    Resolution: Fixed

> 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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