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https://issues.apache.org/jira/browse/HDFS-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Kelly updated HDFS-1580:
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Attachment: HDFS-1580+1521.diff
HDFS-1580.diff
Initial work on 1580. This work is on top of 1521. One of the patches includes
that, so it will apply on top of trunk. The other requires that 1521 has
already been applied.
TestEditLog is passing. I haven't tried any other tests yet. Most should pass,
but anything related to backupnode and secondary will fail for the moment. This
is because of a change I've made to construction to FSImage. I've cleaned this
up and made setStorageDirectories private in NNStorage. This means that if the
storage directories are not read from the configuration file, they must be
specified on creation of FSImage. This makes it easier for FSEditLog to know
when it can operate on NNStorage and when it cannot. Before it had to wait
until someone called setStorageDirectories before doing anything. Very
side-effecty. Not FSEditLog knows that if storage exists the storagedirectories
have been set. This also allows nicer open close semantics on FSEditLog.
I plan to move this functionallity into a sub jira as it's nicely separate from
the journalling mechanism.
> Add interface for generic Write Ahead Logging mechanisms
> --------------------------------------------------------
>
> Key: HDFS-1580
> URL: https://issues.apache.org/jira/browse/HDFS-1580
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ivan Kelly
> Attachments: HDFS-1580+1521.diff, HDFS-1580.diff,
> generic_wal_iface.pdf, generic_wal_iface.pdf, generic_wal_iface.txt
>
>
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