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https://reviews.apache.org/r/4481/
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Review request for bookkeeper.


Summary
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create a snapshot of bookie active ledgers, and then fetch the list of 
zookeeper metadata, then it is safe to do garbage collection.


This addresses bug BOOKKEEPER-193.
    https://issues.apache.org/jira/browse/BOOKKEEPER-193


Diffs
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bookkeeper-server/src/test/java/org/apache/bookkeeper/meta/LedgerManagerTestCase.java
 PRE-CREATION 
  bookkeeper-server/src/test/java/org/apache/bookkeeper/meta/GcLedgersTest.java 
PRE-CREATION 
  bookkeeper-server/src/main/java/org/apache/bookkeeper/meta/SnapshotMap.java 
PRE-CREATION 
  
bookkeeper-server/src/main/java/org/apache/bookkeeper/meta/HierarchicalLedgerManager.java
 9d9bf22 
  
bookkeeper-server/src/main/java/org/apache/bookkeeper/meta/FlatLedgerManager.java
 100cdad 

Diff: https://reviews.apache.org/r/4481/diff


Testing
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Thanks,

Sijie

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