dafu created HELIX-184:
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Summary: avoid reading twice during callback
Key: HELIX-184
URL: https://issues.apache.org/jira/browse/HELIX-184
Project: Apache Helix
Issue Type: Sub-task
Reporter: dafu
current zkclient read the data and provide the data in zk-callback's. but we
normally need to read the data again. it's better that callbacks don't read
data automatically. we can have a new set of api that doesn't read data
automatically.
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