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Date: Thu, 8 Aug 2013 19:18:50 +0000 (UTC)
From: "Grant Ingersoll (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.12662683.1375989528494.27137.1375989530566@arcas>
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Subject: [jira] [Created] (LUCENE-5160) NIOFSDirectory, SimpleFSDirectory
 (others?) don't properly handle valid file and FileChannel read conditions
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Grant Ingersoll created LUCENE-5160:
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             Summary: NIOFSDirectory, SimpleFSDirectory (others?) don't properly handle valid file and FileChannel read conditions
                 Key: LUCENE-5160
                 URL: https://issues.apache.org/jira/browse/LUCENE-5160
             Project: Lucene - Core
          Issue Type: Bug
    Affects Versions: 4.4, 5.0
            Reporter: Grant Ingersoll


Around line 190 of NIOFSDirectory, the loop to read in bytes doesn't properly handle the -1 condition that can be returned from FileChannel.read().  If it returns -1, then it will move the file pointer back and you will enter an infinite loop.  SimpleFSDirectory displays the same characteristics, although I have only seen the issue on NIOFSDirectory.

The code in question from NIOFSDirectory:
{code}
try {
        while (readLength > 0) {
          final int limit;
          if (readLength > chunkSize) {
            // LUCENE-1566 - work around JVM Bug by breaking
            // very large reads into chunks
            limit = readOffset + chunkSize;
          } else {
            limit = readOffset + readLength;
          }
          bb.limit(limit);
          int i = channel.read(bb, pos);
          pos += i;
          readOffset += i;
          readLength -= i;
        }
{code}

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