I was reading some ES
doco<http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/cluster-reroute.html>and
stumbled upon this part of the Cluster Reroute API:
allocate:
"*Allocate an unassigned shard to a node. .... It also accepts the
"allow primary" flag to explicitly specify that it is allowed to explicitly
allocate a primary shard (might result in data loss)."*
Why might this result in data loss?
If I use:
POST /_cluster/reroute
{
"commands" : [ {
"cancel" :
{
"index" : "myindex", "shard" : 4, "node": "somenode",
"allow_primary":"true"
}
}
]
}
To get a node that has unallocated shards back to green, how will I know if
data loss has occured?
How/why is the data being lost?
Thanks,
Mark
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