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From "Denny Ye (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2749) Wrong fsimage format while entering recovery mode
Date Wed, 04 Jan 2012 08:39:40 GMT
Wrong fsimage format while entering recovery mode

                 Key: HDFS-2749
                 URL: https://issues.apache.org/jira/browse/HDFS-2749
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 0.20.2
            Reporter: Denny Ye
            Priority: Critical

hadoop is into a recovery mode and save namespace to disk before the system starting service.
however, there are many situation will cause hadoop enter recovery mode like missing VERSION
file and ckpt file exists due to last failure of checkpoint.
in recovery mode, namespace is loaded from previous fsimage, and the default numFiles of namespace.rootDir
is 1. the numFiles number is read from fsimage (readInt as version, readInt as namespaceId,
readLong as numFiles).
the numFiles number is not updated in namespace when saving namespace.
save namespace just after load fsimage which actually write numFiles which is default value
1 to disk.
the next time to load the saved fsimage from disk when rebooting or secondarynamenode doing
checkpoint, the system will crash (OOM) because this fsimage is incorrect.

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