java - How does Google App Engine manage sessions inside cluster? -

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a cluster contains several nodes, , if 1 of current node down, other nodes can retrieve current user session.

i thinking how same thing myself (session replication) if want create own high availaible paas (cloud).

may use key/value database (nosql) in order store/retrieve sessions ? or similar.

how google google app engine ? google use filter in order rewrite httpsession api (java) ?

thanks

in appengine, session kept in datastore. can same or improve adding caching layer memcache.


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