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Posted to issues@zookeeper.apache.org by "Jason (Jira)" <ji...@apache.org> on 2020/11/18 16:47:00 UTC
[jira] [Commented] (ZOOKEEPER-2553) ZooKeeper cluster unavailable
due to corrupted log file during power failures -- java.io.IOException:
Unreasonable length
[ https://issues.apache.org/jira/browse/ZOOKEEPER-2553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17234811#comment-17234811 ]
Jason commented on ZOOKEEPER-2553:
----------------------------------
Seeing the same/similar problem within Docker Swarm just but doing a simple stop/start of the Stack.
This is Zookeeper 3.5.8:
{{[2020-11-18 16:38:59,163] INFO Started @2367ms (org.eclipse.jetty.server.Server),}}
{{[2020-11-18 16:38:59,164] INFO Started AdminServer on address 0.0.0.0, port 8080 and command URL /commands (org.apache.zookeeper.server.admin.JettyAdminServer),}}
{{[2020-11-18 16:38:59,191] INFO Using org.apache.zookeeper.server.NIOServerCnxnFactory as server connection factory (org.apache.zookeeper.server.ServerCnxnFactory),}}
{{[2020-11-18 16:38:59,194] INFO Configuring NIO connection handler with 10s sessionless connection timeout, 1 selector thread(s), 8 worker threads, and 64 kB direct buffers. (org.apache.zookeeper.server.NIOServerCnxnFactory),}}
{{[2020-11-18 16:38:59,196] INFO binding to port 0.0.0.0/0.0.0.0:2181 (org.apache.zookeeper.server.NIOServerCnxnFactory),}}
{{[2020-11-18 16:38:59,232] INFO zookeeper.snapshotSizeFactor = 0.33 (org.apache.zookeeper.server.ZKDatabase),}}
{{[2020-11-18 16:38:59,236] INFO Reading snapshot /var/lib/zookeeper/data/version-2/snapshot.0 (org.apache.zookeeper.server.persistence.FileSnap),}}
{{[2020-11-18 16:38:59,273] ERROR Unexpected exception, exiting abnormally (org.apache.zookeeper.server.ZooKeeperServerMain),}}
{{java.io.IOException: Unreasonable length = 1702047600,}}
{{ at org.apache.jute.BinaryInputArchive.checkLength(BinaryInputArchive.java:146),}}
{{ at org.apache.jute.BinaryInputArchive.readBuffer(BinaryInputArchive.java:111),}}
{{ at org.apache.zookeeper.server.persistence.Util.readTxnBytes(Util.java:205),}}
{{ at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:684),}}
{{ at org.apache.zookeeper.server.persistence.FileTxnSnapLog.fastForwardFromEdits(FileTxnSnapLog.java:294),}}
{{ at org.apache.zookeeper.server.persistence.FileTxnSnapLog.lambda$restore$0(FileTxnSnapLog.java:229),}}
{{ at org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:253),}}
{{ at org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:240),}}
{{ at org.apache.zookeeper.server.ZooKeeperServer.loadData(ZooKeeperServer.java:290),}}
{{ at org.apache.zookeeper.server.ZooKeeperServer.startdata(ZooKeeperServer.java:450),}}
{{ at org.apache.zookeeper.server.NIOServerCnxnFactory.startup(NIOServerCnxnFactory.java:764),}}
{{ at org.apache.zookeeper.server.ServerCnxnFactory.startup(ServerCnxnFactory.java:98),}}
{{ at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:144),}}
{{ at org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:106),}}
{{ at org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:64),}}
{{ at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:128),}}
{{ at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:82),}}
Is there any workaround or mitigation?
> ZooKeeper cluster unavailable due to corrupted log file during power failures -- java.io.IOException: Unreasonable length
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2553
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2553
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.8
> Environment: Normal ZooKeeper cluster with 3 nodes running Linux
> Reporter: Ramnatthan Alagappan
> Priority: Major
>
> I am running a three node ZooKeeper cluster.
> When a new log file is created by ZooKeeper, I see the following sequence of system calls:
> 1. creat(new_log)
> 2. write(new_log, count=16) // This is a log header I believe/
> 3. truncate(new_log, from 16 bytes to 16 KBytes) // I have configured the log size to be 16K.
> When the above sequence of operations complete, it is reasonable to expect the newly created log file to contain the header(16 bytes) and then filled with zeros till the end of the log.
> But when a crash occurs (due to a power failure), while the truncate system call is in progress, it is possible for the log to contain garbage data when the system restarts from the crash. Note that if the crash occurs just after the truncate system call completes, then there is no problem. Basically, the truncate needs to be atomically persisted for ZooKeeper to recover from crashes correctly or (more realistically) the recovery code needs to deal with the case of expecting garbage in a newly created log.
> As mentioned, if a crash occurs during the truncate system call, then ZooKeeper will fail to start with the following exception. Here is the stack trace:
> java.io.IOException: Unreasonable length = -295704495
> at org.apache.jute.BinaryInputArchive.checkLength(BinaryInputArchive.java:127)
> at org.apache.jute.BinaryInputArchive.readBuffer(BinaryInputArchive.java:92)
> at org.apache.zookeeper.server.persistence.Util.readTxnBytes(Util.java:233)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:625)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:652)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.init(FileTxnLog.java:552)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.<init>(FileTxnLog.java:527)
> at org.apache.zookeeper.server.persistence.FileTxnLog.read(FileTxnLog.java:354)
> at org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:132)
> at org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:223)
> at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:510)
> at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:500)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:153)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:111)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
> [myid:1] - ERROR [main:QuorumPeerMain@89] - Unexpected exception, exiting abnormally
> java.lang.RuntimeException: Unable to run quorum server
> at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:558)
> at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:500)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:153)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:111)
> at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
> Caused by: java.io.IOException: Unreasonable length = -295704495
> at org.apache.jute.BinaryInputArchive.checkLength(BinaryInputArchive.java:127)
> at org.apache.jute.BinaryInputArchive.readBuffer(BinaryInputArchive.java:92)
> at org.apache.zookeeper.server.persistence.Util.readTxnBytes(Util.java:233)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:625)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:652)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.init(FileTxnLog.java:552)
> at org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.<init>(FileTxnLog.java:527)
> at org.apache.zookeeper.server.persistence.FileTxnLog.read(FileTxnLog.java:354)
> at org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:132)
> at org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:223)
> at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:510)
> ... 4 more
> Next, it is possible for two nodes of a 3-node ZooKeeper cluster to reach the same state. In that case, they both will fail to startup, rendering the entire cluster unavailable.
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