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https://issues.apache.org/jira/browse/HBASE-23938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17102411#comment-17102411
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Anoop Sam John commented on HBASE-23938:
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Some times the mutation can be slow for a bit longer period also. (Specially 
when you are using cloud remote storage).  My point is that, then we are adding 
salt to the wound by adding this log also into another table. Are you planning 
to make WAL off for this table?)
When we write only to HDFS it is just one write. In case of HBase table write 
if WAL is there, already one write and then flush and then compactions.  I am 
concerned about this write amplification.


> Replicate slow/large RPC calls to HDFS
> --------------------------------------
>
>                 Key: HBASE-23938
>                 URL: https://issues.apache.org/jira/browse/HBASE-23938
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 3.0.0-alpha-1, 2.3.0, 1.7.0
>            Reporter: Viraj Jasani
>            Assignee: Viraj Jasani
>            Priority: Major
>             Fix For: 3.0.0-alpha-1, 2.3.0
>
>         Attachments: Screen Shot 2020-05-07 at 12.01.26 AM.png
>
>
> We should provide capability to replicate complete slow and large RPC logs to 
> HDFS or create new system table in addition to Ring Buffer. This way we don't 
> lose any of slow logs and operator can retrieve all the slow/large logs. 
> Replicating logs to HDFS / creating new system table should be configurable.



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