Chris Nauroth created HDFS-10312:
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             Summary: Large block reports may fail to decode at NameNode due to 
64 MB protobuf maximum length restriction.
                 Key: HDFS-10312
                 URL: https://issues.apache.org/jira/browse/HDFS-10312
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth


Our RPC server caps the maximum size of incoming messages at 64 MB by default.  
For exceptional circumstances, this can be uptuned using 
{{ipc.maximum.data.length}}.  However, for block reports, there is still an 
internal maximum length restriction of 64 MB enforced by protobuf.  (Sample 
stack trace to follow in comments.)  This issue proposes to apply the same 
override to our block list decoding, so that large block reports can proceed.



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