DataNode to send block reports to multiple namenodes?
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Key: HADOOP-3057
URL: https://issues.apache.org/jira/browse/HADOOP-3057
Project: Hadoop Core
Issue Type: Improvement
Reporter: Marco Nicosia
Priority: Minor
I have this theory that I could test the memory footprint of a new version of
the Hadoop namenode, without interrupting a running instance. We could shut
down the secondary namenode process, and run a new version of the namenode code
on the image file found on the secondary namenode server.
But just running on the image file wouldn't be enough. It'd be great if I could
get a real feel by having all the block reports also make their way to my fake
namenode.
Would it be possible for datanodes to report to two different namenodes, even
if only one is the "active, live" namenode? (I understand that this wouldn't
work if the format of the block report, or worse, the rpc layer, were
incompatible.)
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