Sean Busbey commented on HBASE-20841:

good message. I'd guess folks who run into problems are unlikely to find it by 
searching though. Would adding a blurb to the troubleshooting section that has 
some existing known failures help increase their likelihood of finding help?

> Add note about the limitations when running WAL against the recent versions 
> of hadoop
> -------------------------------------------------------------------------------------
>                 Key: HBASE-20841
>                 URL: https://issues.apache.org/jira/browse/HBASE-20841
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>            Priority: Major
>             Fix For: 3.0.0
>         Attachments: HBASE-20841.patch
> AsyncFSWAL may easily be broken when upgrading the DFSClient, so we 
> introduced a fallback logic in HBASE-20839. And also, WAL can not be written 
> into a directory with EC enabled, but the API for creating a non-EC file in 
> EC directory is not available in hadoop-2.8-, see HBASE-19369 for more 
> details.

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