Hadoop oddity

[Bolle, Jeffrey F.]

In theory I have a cluster with 4 nodes.  When running something like
bin/slaves.sh uptime I get the desired results (all four servers
respond with their uptimes).  However, when I run a crawl only one
server, the host (which also acts as a slave), appears under the nodes
display.  This has happened after the primary server died and had now
been rebuilt.  Had anyone experienced this before or does anyone have
any tips as to where to begin looking for the problem.  Thanks.
 
Jeff