Wei-Chiu Chuang created HDFS-17645:
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Summary: Standby NameNode may fail to replay OP_ADD during
transition to active
Key: HDFS-17645
URL: https://issues.apache.org/jira/browse/HDFS-17645
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Wei-Chiu Chuang
[~boky01] found a bug where an edit log can abort a Standby NameNode when it
transition to active state.
I was able to reproduce it in a unit test. Roughly speaking:
{quote}create a long file name
update file name limit configuration (reduce
dfs.namenode.fs-limits.max-component-length from 255 to 5) on the StandBy
NameNode.
Restart Standby NameNode.
Failover to Standby NameNode.
{quote}
Looking at the relevant code, the intent was that as long as a file is created
and its edit log persisted, even if the file name limit is changed, upon
NameNode restart, the edit log replay should accept the edit log regardless of
the file name length limit change. I think there is a bug in StandBy NameNode
and the fix is to call FSNamespace.setImageLoaded(true) inside
transitionToActive() to indicate that it is replaying an accepted edit log, not
requesting a new transaction.
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