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https://issues.apache.org/jira/browse/HDFS-1137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HDFS-1137.
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Resolution: Not a Problem
> Name node is using the write-ahead log improperly
> -------------------------------------------------
>
> Key: HDFS-1137
> URL: https://issues.apache.org/jira/browse/HDFS-1137
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Benjamin Reed
>
> The Name node is doing the write-ahead log (WAL) (aka edit log) improperly.
> Usually when using WAL, changes are written to the log before they are
> applied to the state. Currently the Namenode does the WAL after applying the
> change. This means that read may see changes before they are durable. A
> client may read information and the server fail before the information is
> written to the WAL, which results in the client reading state that
> disappears. To fix the Namenode should write changes before (aka ahead of)
> applying the change.
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