Aaron T. Myers created HDFS-4462:
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Summary: 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
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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