fail over to loading a different FSImage if the first one we try to load is
corrupt
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Key: HDFS-3277
URL: https://issues.apache.org/jira/browse/HDFS-3277
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Colin Patrick McCabe
Assignee: Colin Patrick McCabe
Most users store multiple copies of the FSImage in order to prevent
catastrophic data loss if a hard disk fails. However, our image loading code
is currently not set up to start reading another FSImage if loading the first
one does not succeed. We should add this capability.
We should also be sure to remove the FSImage directory that failed from the
list of FSImage directories to write to, in the way we normally do when a write
(as opopsed to read) fails.
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