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From "ZhongYu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-7664) IndexOutOfBoundsException thrown during repair
Date Fri, 01 Aug 2014 08:02:38 GMT
ZhongYu created CASSANDRA-7664:
----------------------------------

             Summary: IndexOutOfBoundsException thrown during repair
                 Key: CASSANDRA-7664
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7664
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: RHEL 6.1
Casandra 1.2.18
            Reporter: ZhongYu


I was running repair command with moderate read and write load at the same time. And I found
tens of IndexOutOfBoundsException in system log as follows:
ERROR [Thread-6056] 2013-05-22 14:47:59,416 CassandraDaemon.java (line132) Exception in thread
Thread[Thread-6056,5,main]
java.lang.IndexOutOfBoundsException
        at sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:75)
        at org.apache.cassandra.streaming.compress.CompressedInputStream$Reader.runMayThrow(CompressedInputStream.java:151)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
        at java.lang.Thread.run(Thread.java:662)

I read the source code of CompressedInputStream.java and found there surely will throw IndexOutOfBoundsException
in the following situation:

{code:title=Bar.java|borderStyle=solid}
// Part of CompressedInputStream.java start from Line 139
       protected void runMayThrow() throws Exception
        {
            byte[] compressedWithCRC;
            while (chunks.hasNext())
            {
                CompressionMetadata.Chunk chunk = chunks.next();

                int readLength = chunk.length + 4; // read with CRC
                compressedWithCRC = new byte[readLength];

                int bufferRead = 0;
                while (bufferRead < readLength)
                    bufferRead += source.read(compressedWithCRC, bufferRead, readLength -
bufferRead);
                dataBuffer.put(compressedWithCRC);
            }
        }
{code}
If read function read nothing because the end of the stream has been reached, it will return
-1, thus bufferRead can be negetive. In the next turn read function will throw IndexOutOfBoundsException
because bufferRead is negetive. 



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