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https://issues.apache.org/jira/browse/HDFS-6440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesse Yates updated HDFS-6440:
------------------------------
Attachment: hdfs-6440-trunk-v5.patch
Attaching updated patch, rebased on latest trunk. My usual covering suite of
mNN tests* passed locally a few times.
Notable changes:
- Moving checkpoint lock inside actually needing to take the checkpoint (not
functional change, just a locking improvement)
- Cleanup determining when to send checkpoints, so we only calculate if we
should send it when we know that the checkpoint will actually be created.
{code}
*mvn clean test
-Dtest=TestPipelinesFailover,TestRollingUpgrade,TestZKFailoverController,TestBookKeeperHACheckpoints,TestBlockToken,TestBackupNode,TestCheckpoint,TestDFSUpgradeFromImage,TestBootstrapStandby,TestBootstrapStandbyWithQJM,TestEditLogTailer,TestFailoverWithBlockTokens,TestHAConfiguration,TestRemoteNameNodeInfo,TestSeveralNameNodes,TestStandbyCheckpoints,TestDNFencingWithReplication
{code}
> Support more than 2 NameNodes
> -----------------------------
>
> Key: HDFS-6440
> URL: https://issues.apache.org/jira/browse/HDFS-6440
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: auto-failover, ha, namenode
> Affects Versions: 2.4.0
> Reporter: Jesse Yates
> Assignee: Jesse Yates
> Fix For: 3.0.0
>
> Attachments: Multiple-Standby-NameNodes_V1.pdf,
> hdfs-6440-cdh-4.5-full.patch, hdfs-6440-trunk-v1.patch,
> hdfs-6440-trunk-v1.patch, hdfs-6440-trunk-v3.patch, hdfs-6440-trunk-v4.patch,
> hdfs-6440-trunk-v5.patch, hdfs-multiple-snn-trunk-v0.patch
>
>
> Most of the work is already done to support more than 2 NameNodes (one
> active, one standby). This would be the last bit to support running multiple
> _standby_ NameNodes; one of the standbys should be available for fail-over.
> Mostly, this is a matter of updating how we parse configurations, some
> complexity around managing the checkpointing, and updating a whole lot of
> tests.
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