Daryn Sharp created HDFS-4410:
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Summary: BlockListAsLongs ctors produce corrupt block list
Key: HDFS-4410
URL: https://issues.apache.org/jira/browse/HDFS-4410
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 2.0.0-alpha, 0.23.0, 3.0.0
Reporter: Daryn Sharp
{{BlockListAsLongs()}} and {{BlockListAsLongs(long[])}} produce invalid
instances. The former calls the latter with {{BlockListAsLongs(null)}}, which
is internally short-circuited to create an internal {{blockList}} array that
does not contain the sentinel delimiting block. An assert in
{{getNumberOfBlocks}} will trip, which also prevents the "empty" block list
from being iterated.
Both ctors are present in the call tree for DN registration and block reports.
Either those code paths are never executed, or the exceptions are swallowed and
go unnoticed. I found it while writing unit tests.
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