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https://issues.apache.org/jira/browse/PHOENIX-4405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16267321#comment-16267321
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Josh Elser commented on PHOENIX-4405:
-------------------------------------

Looks like there is a wrinkle in TestPerRegionIndexWriteCache where it's busted 
on some semantic changes (when using Hadoop3 it fails, not sure if failing 
because of Hadoop3 or HBase2 changes though).

{noformat}
2017-11-27 14:29:45,787 ERROR [main] 
org.apache.hadoop.hbase.wal.FSHLogProvider(71): The RegionServer write ahead 
log provider for FileSystem implementations relies on the ability to call 
hflush for proper operation during component     failures, but the current 
FileSystem does not support doing so. Please check the config value of 
'hbase.wal.dir' and ensure it points to a FileSystem mount that has suitable 
capabilities for output streams.
{noformat}

Looks like HBase added something that fails hard when hflush doesn't actually 
exist (e.g. using ChecksumFileSystem).

> Compilation error using Hadoop3
> -------------------------------
>
>                 Key: PHOENIX-4405
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4405
>             Project: Phoenix
>          Issue Type: Sub-task
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>            Priority: Critical
>             Fix For: 5.0
>
>
> {noformat}
> [ERROR] 
> /Users/jelser/projects/phoenix.git/phoenix-core/src/main/java/org/apache/phoenix/trace/PhoenixMetricsSink.java:[37,40]
>  package org.apache.commons.configuration does not exist
> [ERROR] 
> /Users/jelser/projects/phoenix.git/phoenix-core/src/main/java/org/apache/phoenix/trace/PhoenixMetricsSink.java:[110,22]
>  cannot find symbol
>   symbol:   class SubsetConfiguration
>   location: class org.apache.phoenix.trace.PhoenixMetricsSink
> [INFO] 2 errors
> {noformat}
> Flipping over our Hadoop version seems to bring along some 
> commons-configuration dependency change which requires a tweaking in Phoenix. 
> Should be trivial.



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