A Bookkeeper can only open one LedgerHandle to a specific ledger at a time, if 
it expects them to work
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                 Key: BOOKKEEPER-105
                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-105
             Project: Bookkeeper
          Issue Type: Bug
            Reporter: Ivan Kelly


If you open two ledger handles pointing to the same ledger, using the same 
client, you will not be able to read from both. This is due to them sharing 
PerChannelBookieClient instances. PerChannelBookieClient has a member 
{code}
    ConcurrentHashMap<CompletionKey, ReadCompletion> readCompletions = new 
ConcurrentHashMap<CompletionKey, ReadCompletion>();
{code}
where CompletionKey is the ledgerId and entryId. If both LedgerHandles try to 
read the same entryId, they'll override each other on this hashmap.

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