[jira] [Created] (ZOOKEEPER-2249) CRC check failed when preAlloc size smaller than node data

["Benjamin Jaton (JIRA)" <ji...@apache.org>]

Benjamin Jaton created ZOOKEEPER-2249:
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             Summary: CRC check failed when preAlloc size smaller than node data
                 Key: ZOOKEEPER-2249
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2249
             Project: ZooKeeper
          Issue Type: Bug
            Reporter: Benjamin Jaton


Unexpected exception, exiting abnormally 
java.io.IOException: CRC check failed 
org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:612) 
org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:157) 
org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:223) 
org.apache.zookeeper.server.ZooKeeperServer.loadData(ZooKeeperServer.java:272) 
org.apache.zookeeper.server.ZooKeeperServer.startdata(ZooKeeperServer.java:399)

To reproduce, set the preAllocSize to 8MB, the jute.maxbuffer to 20MB and try saving a 15MB node several times.
In my case the erroneous CRC appears after the second save. I use the LogFormatter class to detect it.
I suspect that the CRC error happens when the new transaction log is created, the code probably expects to have enough room to save the transaction when creating a new file, but it's too small.



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