David Smiley created SOLR-14425:
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             Summary: Fix ZK sync usage to be synchronous (blocking)
                 Key: SOLR-14425
                 URL: https://issues.apache.org/jira/browse/SOLR-14425
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud
            Reporter: David Smiley


As of this writing, we only use one call to ZK's "sync" method.  It's related 
to collection aliases -- I added this.  I discovered I misunderstood the 
semantics of the API; it syncs in the background and thus returns immediately.  
Looking at ZK's sync CLI command and Curator both made me realize my folly.  
I'm considering this only a "minor" issue because I'm not sure I've seen a bug 
from this; or maybe I did in spooky test failures over a year ago -- I'm not 
sure.  And we don't use this pervasively (yet).

It occurred to me that if Solr embraced the Curator framework abstraction over 
ZooKeeper, I would not have fallen into that trap.  I'll file a separate issue 
for that.



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