Package org.apache.pulsar.metadata.bookkeeper

Class LegacyHierarchicalLedgerRangeIterator

java.lang.Object
org.apache.pulsar.metadata.bookkeeper.LegacyHierarchicalLedgerRangeIterator
All Implemented Interfaces:
org.apache.bookkeeper.meta.LedgerManager.LedgerRangeIterator
public class LegacyHierarchicalLedgerRangeIterator extends Object implements org.apache.bookkeeper.meta.LedgerManager.LedgerRangeIterator
Hierarchical Ledger Manager which manages ledger meta in zookeeper using 2-level hierarchical znodes.

LegacyHierarchicalLedgerManager splits the generated id into 3 parts (2-4-4): 

<level1 (2 digits)><level2 (4 digits)><level3 (4 digits)>
These 3 parts are used to form the actual ledger node path used to store ledger metadata: 
(ledgersRootPath)/level1/level2/L(level3)
E.g Ledger 0000000001 is split into 3 parts 00, 0000, 0001, which is stored in (ledgersRootPath)/00/0000/L0001. So each znode could have at most 10000 ledgers, which avoids errors during garbage collection due to lists of children that are too long.

  • Constructor Details

    • LegacyHierarchicalLedgerRangeIterator

      public LegacyHierarchicalLedgerRangeIterator(MetadataStore store, String ledgersRoot)

  • Method Details

    • hasNext

      public boolean hasNext() throws IOException
      Specified by:
      hasNext in interface org.apache.bookkeeper.meta.LedgerManager.LedgerRangeIterator
      Throws:
      IOException

    • next

      public org.apache.bookkeeper.meta.LedgerManager.LedgerRange next() throws IOException
      Specified by:
      next in interface org.apache.bookkeeper.meta.LedgerManager.LedgerRangeIterator
      Throws:
      IOException