Andre Araujo created HDFS-12630:
-----------------------------------
Summary: Rolling restart can create inconsistency between blockMap
and corrupt replicas map
Key: HDFS-12630
URL: https://issues.apache.org/jira/browse/HDFS-12630
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.6.0
Reporter: Andre Araujo
After a NN rolling restart several HDFS files started showing block problems.
Running FSCK for one of the files or for the directory that contained it would
complete with a FAILED message but without any details of the failure.
The NameNode log showed the following:
{code}
2017-10-10 16:58:32,147 INFO org.apache.hadoop.hdfs.server.namenode.NameNode:
FSCK started by hdfs (auth:KERBEROS_SSL) from /10.92.128.4 for path
/user/prod/data/file_20171010092201.csv at Tue Oct 10 16:58:32 PDT 2017
2017-10-10 16:58:32,147 WARN
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: Inconsistent number
of corrupt replicas for blk_1941920008_1133195379 blockMap has 1 but corrupt
replicas map has 2
2017-10-10 16:58:32,147 WARN org.apache.hadoop.hdfs.server.namenode.NameNode:
Fsck on path '/user/prod/data/file_20171010092201.csv' FAILED
java.lang.ArrayIndexOutOfBoundsException
{code}
After triggering a full block report for all the DNs the problem went away.
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