mgao0 opened a new pull request #952: Distributed lock
URL: https://github.com/apache/helix/pull/952
 
 
   - [ ] Issues
   
    My PR addresses the following Helix issues and references them in the PR 
description:
   #672 
   
   - [ ] Description
   
   1. Non blocking lock. We will reserve the capability to extend to a blocking 
lock in the future, meaning that we could provide the boolean parameter in API 
for either nonblocking or blocking.
   2. Timeout support. The client need to input the timeout when it tries to 
acquire the lock. After timeout, if no other client tries to get the lock, the 
client can still keep the lock, if other client tries to acquire the lock, and 
finds the previous client already timeout, the previous client will be forced 
to release the lock.
   3. Lock message support. The client can input the reason for the lock (a 
string) when it tries to acquire the lock, and future lock operation, when 
fails, will get the message for the current lock. 
   4. Java API support.
   5. No notification support. When a client loses its lock after timeout or 
during SRE maintenance work, there is no notification sent out to it.
   
   - [ ] Tests
   
    The following tests are written for this issue:
   TestZKHelixNonblockingLock
   
   - [ ] Commits
   
    My commits all reference appropriate Apache Helix GitHub issues in their 
subject lines. In addition, my commits follow the guidelines from "How to write 
a good git commit message":
   Subject is separated from body by a blank line
   Subject is limited to 50 characters (not including Jira issue reference)
   Subject does not end with a period
   Subject uses the imperative mood ("add", not "adding")
   Body wraps at 72 characters
   Body explains "what" and "why", not "how"
   Documentation (Optional)
    In case of new functionality, my PR adds documentation in the following 
wiki page:
   (Link the GitHub wiki you added)
   
   - [ ] Code Quality
   
    My diff has been formatted using helix-style.xml
   (helix-style-intellij.xml if IntelliJ IDE is used)

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