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https://issues.apache.org/jira/browse/ZOOKEEPER-2553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17691351#comment-17691351
]
Gao Fei commented on ZOOKEEPER-2553:
------------------------------------
We also encountered the same problem. A three-node zookeeper cluster was
deployed in the environment. The version is 3.4.14. The three zookeeper
processes were distributed on the three nodes. Once, one of the nodes was
occupied by 100% of the memory (other services caused), and then the node
restarted and recovered. After the node started, the zookeeper process of the
node could not be started, and the following error was reported。
I wonder why this happens? What is the reason for "Unreasonable length"
{code:java}
[2023-02-10 09:23:20,719] ERROR Unable to load database on disk
(org.apache.zookeeper.server.quorum.QuorumPeer)
java.io.IOException: Unreasonable length = 1818846059
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:208)
at
org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:632)
at
org.apache.zookeeper.server.persistence.FileTxnSnapLog.fastForwardFromEdits(FileTxnSnapLog.java:219)
at
org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:176)
at org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:217)
at
org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:646)
at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:636)
at
org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:170)
at
org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:114)
at
org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:81){code}
> 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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