[jira] [Created] (SOLR-4739) May be lost update when creating or deleting Alias

["milesli (JIRA)" <ji...@apache.org>]

milesli created SOLR-4739:
-----------------------------

             Summary: May be lost update when creating or deleting Alias 
                 Key: SOLR-4739
                 URL: https://issues.apache.org/jira/browse/SOLR-4739
             Project: Solr
          Issue Type: Bug
            Reporter: milesli


we may create or delete alias before zookeeper notify alias watch, 
then clone the current aliases and update
finally send data to zookeeper.
so it may lead to lost of update. 



add a line code:  zkStateReader.setAliases(newAliases);

...

try {
      zkStateReader.getZkClient().setData(ZkStateReader.ALIASES,
          jsonBytes, true);
      
     // update the current aliases
      zkStateReader.setAliases(newAliases);
      
      checkForAlias(aliasName, collections);
      // some fudge for other nodes
      Thread.sleep(100);
    } catch (KeeperException e) {
      log.error("", e);
      throw new SolrException(ErrorCode.SERVER_ERROR, e);
    } catch (InterruptedException e) {
      log.warn("", e);
      throw new SolrException(ErrorCode.SERVER_ERROR, e);
    }

...



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