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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8498) Blocks can be committed with wrong size
Date Fri, 29 May 2015 15:01:18 GMT
Daryn Sharp created HDFS-8498:

             Summary: Blocks can be committed with wrong size
                 Key: HDFS-8498
                 URL: https://issues.apache.org/jira/browse/HDFS-8498
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.5.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp
            Priority: Critical

When an IBR for a UC block arrives, the NN updates the expected location's block and replica
state _only_ if it's on an unexpected storage for an expected DN.  If it's for an expected
storage, only the genstamp is updated.  When the block is committed, and the expected locations
are verified, only the genstamp is checked.  The size is not checked but it wasn't updated
in the expected locations anyway.

A faulty client may misreport the size when committing the block.  The block is effectively
corrupted.  If the NN issues replications, the received IBR is considered corrupt, the NN
invalidates the block, immediately issues another replication.  The NN eventually realizes
all the original replicas are corrupt after full BRs are received from the original DNs.

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