bookkeeper-server/src/main/java/org/apache/bookkeeper/meta/ZkLedgerIdGenerator.java [125:134]:
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    private static long getLedgerIdFromGenPath(String nodeName, String ledgerPrefix) throws IOException {
        long ledgerId;
        try {
            String[] parts = nodeName.split(ledgerPrefix);
            ledgerId = Long.parseLong(parts[parts.length - 1]);
        } catch (NumberFormatException e) {
            throw new IOException(e);
        }
        return ledgerId;
    }
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bookkeeper-server/src/main/java/org/apache/bookkeeper/meta/FlatLedgerManager.java [72:81]:
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    public long getLedgerId(String nodeName) throws IOException {
        long ledgerId;
        try {
            String[] parts = nodeName.split(ledgerPrefix);
            ledgerId = Long.parseLong(parts[parts.length - 1]);
        } catch (NumberFormatException e) {
            throw new IOException(e);
        }
        return ledgerId;
    }
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