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https://issues.apache.org/jira/browse/ZOOKEEPER-1621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15616237#comment-15616237
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Abhishek Rai commented on ZOOKEEPER-1621:
-----------------------------------------
Thanks [~mkizner]. Your suggestion of doing this only for the most recent txn
log file is sound. Are you also suggesting that we delete this truncated txn
log file?
Cause, if we skip it and don't delete, then in the future, newer txn log files
will get created. So, the truncated txn log file will no longer be the latest
txn log when we do a purge afterwards.
Deletion seems consistent with this approach as well as consistent with
PurgeTxnLog's behavior.
> ZooKeeper does not recover from crash when disk was full
> --------------------------------------------------------
>
> Key: ZOOKEEPER-1621
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1621
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.3
> Environment: Ubuntu 12.04, Amazon EC2 instance
> Reporter: David Arthur
> Assignee: Michi Mutsuzaki
> Fix For: 3.5.3, 3.6.0
>
> Attachments: ZOOKEEPER-1621.patch, zookeeper.log.gz
>
>
> The disk that ZooKeeper was using filled up. During a snapshot write, I got
> the following exception
> 2013-01-16 03:11:14,098 - ERROR [SyncThread:0:SyncRequestProcessor@151] -
> Severe unrecoverable error, exiting
> java.io.IOException: No space left on device
> at java.io.FileOutputStream.writeBytes(Native Method)
> at java.io.FileOutputStream.write(FileOutputStream.java:282)
> at
> java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
> at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog.commit(FileTxnLog.java:309)
> at
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.commit(FileTxnSnapLog.java:306)
> at org.apache.zookeeper.server.ZKDatabase.commit(ZKDatabase.java:484)
> at
> org.apache.zookeeper.server.SyncRequestProcessor.flush(SyncRequestProcessor.java:162)
> at
> org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:101)
> Then many subsequent exceptions like:
> 2013-01-16 15:02:23,984 - ERROR [main:Util@239] - Last transaction was
> partial.
> 2013-01-16 15:02:23,985 - ERROR [main:ZooKeeperServerMain@63] - Unexpected
> exception, exiting abnormally
> java.io.EOFException
> at java.io.DataInputStream.readInt(DataInputStream.java:375)
> at
> org.apache.jute.BinaryInputArchive.readInt(BinaryInputArchive.java:63)
> at
> org.apache.zookeeper.server.persistence.FileHeader.deserialize(FileHeader.java:64)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.inStreamCreated(FileTxnLog.java:558)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.createInputArchive(FileTxnLog.java:577)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.goToNextLog(FileTxnLog.java:543)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:625)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.init(FileTxnLog.java:529)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.<init>(FileTxnLog.java:504)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog.read(FileTxnLog.java:341)
> at
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:130)
> at
> org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:223)
> at
> org.apache.zookeeper.server.ZooKeeperServer.loadData(ZooKeeperServer.java:259)
> at
> org.apache.zookeeper.server.ZooKeeperServer.startdata(ZooKeeperServer.java:386)
> at
> org.apache.zookeeper.server.NIOServerCnxnFactory.startup(NIOServerCnxnFactory.java:138)
> at
> org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:112)
> at
> org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:86)
> at
> org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:52)
> at
> org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
> at
> org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
> It seems to me that writing the transaction log should be fully atomic to
> avoid such situations. Is this not the case?
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