[jira] [Assigned] (ZOOKEEPER-3006) Potential NPE in ZKDatabase#calculateTxnLogSizeLimit

["Edward Ribeiro (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-3006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Edward Ribeiro reassigned ZOOKEEPER-3006:
-----------------------------------------

    Assignee: Edward Ribeiro

> Potential NPE in ZKDatabase#calculateTxnLogSizeLimit
> ----------------------------------------------------
>
>                 Key: ZOOKEEPER-3006
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3006
>             Project: ZooKeeper
>          Issue Type: Bug
>    Affects Versions: 3.6.0
>            Reporter: lujie
>            Assignee: Edward Ribeiro
>            Priority: Major
>
> I have found a potential NPE in ZKDatabase#calculateTxnLogSizeLimit:
>  
> {code:java}
> //ZKDatabase
> public long calculateTxnLogSizeLimit() {
> long snapSize = 0;
> try {
> snapSize = snapLog.findMostRecentSnapshot().length();
> } catch (IOException e) {
> LOG.error("Unable to get size of most recent snapshot");
> }
> return (long) (snapSize * snapshotSizeFactor);
> }
> {code}
>  in FileTxnSnapLog#findMostRecentSnapshot(), it will return the result of  FileSnap#findMostRecentSnapshot:
> {code:java}
> // called by FileTxnSnapLog#findMostRecentSnapshot()
> public File findMostRecentSnapshot() throws IOException {
> List<File> files = findNValidSnapshots(1);
> if (files.size() == 0) {
> return null;
> }
> return files.get(0);
> }
> {code}
> So it will return null when the files sizes is 0, but ZKDatabase#calculateTxnLogSizeLimit has no null checker
>  
>  



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