[jira] [Resolved] (ACCUMULO-578) use hdfs for the walog

["Eric Newton (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ACCUMULO-578?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Newton resolved ACCUMULO-578.
----------------------------------

    Resolution: Fixed
    
> use hdfs for the walog
> ----------------------
>
>                 Key: ACCUMULO-578
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-578
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: logger, tserver
>    Affects Versions: 1.5.0-SNAPSHOT
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>         Attachments: HDFS_WAL_states.pdf, NNOpsComparison.pdf, comparison.png
>
>
> Using HDFS for walogs would fix:
>  * ACCUMULO-84: any node can read the replicated files
>  * ACCUMULO-558: wouldn't need to monitor loggers
>  * ACCUMULO-544: log references wouldn't include hostnames
>  * ACCUMULO-423: wouldn't need to monitor loggers
>  * ACCUMULO-258: hdfs has load balancing already
> To implement it, we would need the ability to distribute log sorts.
> Continuing to use loggers helps us avoid:
>  * hdfs pipeline strategy
>  * we don't have fine-grained insight when a single node makes dfs slow
>  * additional namenode pressure
>  * flexibility: for example, we can add fadvise() calls to the logger before HDFS supports it

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