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https://issues.apache.org/jira/browse/CASSANDRA-12539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15614667#comment-15614667
]
Arvind Nithrakashyap commented on CASSANDRA-12539:
--------------------------------------------------
It looks like a crash while writing the logfile can lead to a zero byte file.
The following patch which causes a crash at a specific point reliably produces
a commit log full of zeros
{noformat}
diff --git a/src/java/org/apache/cassandra/db/commitlog/CommitLogSegment.java
b/src/java/org/apache/cassandra/db/commitlog/CommitLogSegment.java
index 0a03c3c..20cddf8 100644
--- a/src/java/org/apache/cassandra/db/commitlog/CommitLogSegment.java
+++ b/src/java/org/apache/cassandra/db/commitlog/CommitLogSegment.java
@@ -153,6 +153,7 @@ public abstract class CommitLogSegment
descriptor = new CommitLogDescriptor(id,
commitLog.configuration.getCompressorClass());
logFile = new File(commitLog.location, descriptor.fileName());
+ logger.error("location="+descriptor.fileName());
try
{
channel = FileChannel.open(logFile.toPath(),
StandardOpenOption.WRITE, StandardOpenOption.READ, StandardOpenOption.CREATE);
@@ -164,6 +165,9 @@ public abstract class CommitLogSegment
}
buffer = createBuffer(commitLog);
+ if (true) {
+ throw new IllegalArgumentException("Here!");
+ }
// write the header
CommitLogDescriptor.writeHeader(buffer, descriptor);
endOfBuffer = buffer.capacity();
{noformat}
> Empty CommitLog prevents restart
> --------------------------------
>
> Key: CASSANDRA-12539
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12539
> Project: Cassandra
> Issue Type: Bug
> Reporter: Stefano Ortolani
>
> A node just crashed (known cause: CASSANDRA-11594) but to my surprise (unlike
> other time) restarting simply fails.
> Checking the logs showed:
> {noformat}
> ERROR [main] 2016-08-25 17:05:22,611 JVMStabilityInspector.java:82 - Exiting
> due to error while processing commit log during initialization.
> org.apache.cassandra.db.commitlog.CommitLogReplayer$CommitLogReplayException:
> Could not read commit log descriptor in file
> /data/cassandra/commitlog/CommitLog-6-1468235564433.log
> at
> org.apache.cassandra.db.commitlog.CommitLogReplayer.handleReplayError(CommitLogReplayer.java:650)
> [apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.commitlog.CommitLogReplayer.recover(CommitLogReplayer.java:327)
> [apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.commitlog.CommitLogReplayer.recover(CommitLogReplayer.java:148)
> [apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:181)
> [apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:161)
> [apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:289)
> [apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:557)
> [apache-cassandra-3.0.8.jar:3.0.8]
> at
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:685)
> [apache-cassandra-3.0.8.jar:3.0.8]
> INFO [main] 2016-08-25 17:08:56,944 YamlConfigurationLoader.java:85 -
> Configuration location: file:/etc/cassandra/cassandra.yaml
> {noformat}
> Deleting the empty file fixes the problem.
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