Uma Maheswara Rao G created BOOKKEEPER-234:
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             Summary: EntryLogger will throw NPE, if dirs does not exist or IO 
Errors.
                 Key: BOOKKEEPER-234
                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-234
             Project: Bookkeeper
          Issue Type: Bug
          Components: bookkeeper-server
    Affects Versions: 4.1.0
            Reporter: Uma Maheswara Rao G
            Assignee: Uma Maheswara Rao G


I think, Entry log should check the exitance of directories, before going to 
get the last Log entries. Because, listFiles will retunr null on non existant 
directories or any IO Errors. We have to add the check for directory existnace 
check and null checks in side getLastLogID api in EntryLogger.

We may need to handle in LedgerCacheImpl also.

Do we need to add them in bad disks list? and others will refer this list 
before they use the dirs.

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