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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4462) 2NN will fail to checkpoint after an HDFS upgrade from a pre-federation version of HDFS
Date Fri, 01 Feb 2013 01:38:11 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers updated HDFS-4462:
---------------------------------

    Attachment: HDFS-4462.patch

Here's a patch which addresses the issue by only comparing the namespace IDs to determine
if this is the same NN/2NN pair, instead of the NS IDs and BP IDs/Cluster IDs. NS IDs predate
federation so this allows upgrades from pre-federation versions of HDFS. This patch also makes
sure that we definitely reload the downloaded fsimage from disk in the case that we've identified
that the 2NN's metadata does not match the layout version of the NN's.
                
> 2NN will fail to checkpoint after an HDFS upgrade from a pre-federation version of HDFS
> ---------------------------------------------------------------------------------------
>
>                 Key: HDFS-4462
>                 URL: https://issues.apache.org/jira/browse/HDFS-4462
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.0.2-alpha
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-4462.patch
>
>
> The 2NN currently has logic to detect when its on-disk FS metadata needs an upgrade with
respect to the NN's metadata (i.e. the layout versions are different) and in this case it
will proceed with the checkpoint despite storage signatures not matching precisely if the
BP ID and Cluster ID do match exactly. However, in situations where we're upgrading from versions
of HDFS prior to federation, which had no BP IDs or Cluster IDs, checkpoints will always fail
with an error like the following:
> {noformat}
> 13/01/31 17:02:25 ERROR namenode.SecondaryNameNode: checkpoint: Inconsistent checkpoint
fields.
> LV = -40 namespaceID = 403832480 cTime = 1359680537192 ; clusterId = CID-0df6ff22-1165-4c7d-9630-429972a7737c
; blockpoolId = BP-1520616013-172.21.3.106-1359680537136.
> Expecting respectively: -19; 403832480; 0; ; .
> {noformat}

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