[jira] [Created] (CASSANDRA-6791) CompressedSequentialWriter can write zero-length segments during scrub

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

Jonathan Ellis created CASSANDRA-6791:
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             Summary: CompressedSequentialWriter can write zero-length segments during scrub
                 Key: CASSANDRA-6791
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6791
             Project: Cassandra
          Issue Type: Bug
          Components: Core
            Reporter: Jonathan Ellis
            Assignee: Marcus Eriksson
            Priority: Minor
             Fix For: 1.2.16, 2.0.6


This results in errors like this:

{noformat}
java.lang.IllegalArgumentException
	at java.nio.Buffer.limit(Buffer.java:267)
	at org.apache.cassandra.io.compress.CompressedRandomAccessReader.decompressChunk(CompressedRandomAccessReader.java:108)
	at org.apache.cassandra.io.compress.CompressedRandomAccessReader.reBuffer(CompressedRandomAccessReader.java:87)
	at org.apache.cassandra.io.util.RandomAccessReader.seek(RandomAccessReader.java:280)
{noformat}

(Because a zero-length chunk actually turns into a length of -4 in the {{compressed.limit(chunk.length)}} call, since no checksum is written either.)

I thought this would be from two bad rows in a row, but it's not; the source file that resulted in scrub creating this, did not have any of those.  (But it does have several instances of bad-good-bad, i.e. separated by exactly one row, that is not large enough to force a new compressed chunk.)




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