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https://issues.apache.org/jira/browse/RATIS-815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17036961#comment-17036961
 ] 

Lokesh Jain commented on RATIS-815:
-----------------------------------

Attached logs and dumps collected by [~adoroszlai] on his cluster. Dumps were 
collected using DefaultLogDump utility.

> Log entry corrupted with 0 checksum
> -----------------------------------
>
>                 Key: RATIS-815
>                 URL: https://issues.apache.org/jira/browse/RATIS-815
>             Project: Ratis
>          Issue Type: Bug
>    Affects Versions: 0.5.0
>            Reporter: Attila Doroszlai
>            Priority: Blocker
>         Attachments: dumps.tar.gz, logs.tar.gz
>
>
> After writing a few large keys (128MB) with very small chunks size (64KB) in 
> Ozone, Ratis reports log entry corruption due to checksum error:
> {code}
> 2020-02-13 12:01:41 INFO  SegmentedRaftLogWorker:396 - 
> e5e4fd1e-aa81-48a2-98f9-b1ba24531624@group-B85226EEE236-SegmentedRaftLogWorker:
>  Rolling segment log-62379_62465 to index:62465
> 2020-02-13 12:01:41 INFO  SegmentedRaftLogWorker:541 - 
> e5e4fd1e-aa81-48a2-98f9-b1ba24531624@group-B85226EEE236-SegmentedRaftLogWorker:
>  Rolled log segment from 
> /data/metadata/ratis/f89fc072-9ee9-459b-85d1-b85226eee236/current/log_inprogress_62379
>  to 
> /data/metadata/ratis/f89fc072-9ee9-459b-85d1-b85226eee236/current/log_62379-62465
> 2020-02-13 12:01:41 INFO  SegmentedRaftLogWorker:583 - 
> e5e4fd1e-aa81-48a2-98f9-b1ba24531624@group-B85226EEE236-SegmentedRaftLogWorker:
>  created new log segment 
> /data/metadata/ratis/f89fc072-9ee9-459b-85d1-b85226eee236/current/log_inprogress_62466
> 2020-02-13 12:01:41 ERROR LogAppender:81 - 
> e5e4fd1e-aa81-48a2-98f9-b1ba24531624@group-B85226EEE236->ac5b3434-874b-4375-8a03-989e8c7fb692-GrpcLogAppender-AppenderDaemon
>  failed RaftLog
> org.apache.ratis.server.raftlog.RaftLogIOException: 
> org.apache.ratis.protocol.ChecksumException: Log entry corrupted: Calculated 
> checksum is CDFED097 but read checksum is 00000000.
>       at 
> org.apache.ratis.server.raftlog.segmented.LogSegment.loadCache(LogSegment.java:311)
>       at 
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.get(SegmentedRaftLog.java:292)
>       at 
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLog.getEntryWithData(SegmentedRaftLog.java:297)
>       at 
> org.apache.ratis.server.impl.LogAppender.createRequest(LogAppender.java:213)
>       at 
> org.apache.ratis.grpc.server.GrpcLogAppender.appendLog(GrpcLogAppender.java:179)
>       at 
> org.apache.ratis.grpc.server.GrpcLogAppender.runAppenderImpl(GrpcLogAppender.java:122)
>       at 
> org.apache.ratis.server.impl.LogAppender$AppenderDaemon.run(LogAppender.java:77)
>       at java.lang.Thread.run(Thread.java:748)
> Caused by: org.apache.ratis.protocol.ChecksumException: Log entry corrupted: 
> Calculated checksum is CDFED097 but read checksum is 00000000.
>       at 
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogReader.decodeEntry(SegmentedRaftLogReader.java:312)
>       at 
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogReader.readEntry(SegmentedRaftLogReader.java:194)
>       at 
> org.apache.ratis.server.raftlog.segmented.SegmentedRaftLogInputStream.nextEntry(SegmentedRaftLogInputStream.java:129)
>       at 
> org.apache.ratis.server.raftlog.segmented.LogSegment.readSegmentFile(LogSegment.java:98)
>       at 
> org.apache.ratis.server.raftlog.segmented.LogSegment$LogEntryLoader.load(LogSegment.java:202)
>       at 
> org.apache.ratis.server.raftlog.segmented.LogSegment.loadCache(LogSegment.java:309)
>       ... 7 more
> {code}
> Steps to reproduce:
> 1. Configure Ozone with 64KB chunk size and slightly higher buffer sizes:
>     {code}
> ozone.scm.chunk.size: 64KB
> ozone.client.stream.buffer.flush.size: 256KB
> ozone.client.stream.buffer.max.size: 1MB
> {code}
> 2. Run Freon:
>     {code}
> ozone freon ockg -n 1 -t 1 -p warmup
> ozone freon ockg -p test -t 8 -s 134217728 -n 32
> {code}
> Interestingly, even {{log_5106-5509}} has invalid entry (according to log 
> dump utility):
> {code}
> Processing Raft Log file: 
> /data/metadata/ratis/f89fc072-9ee9-459b-85d1-b85226eee236/current/log_5106-5509
>  size:1030796
> ...
> (t:1, i:5161), STATEMACHINELOGENTRY, client-296B6A48E40D, cid=3307
> Exception in thread "main" org.apache.ratis.protocol.ChecksumException: Log 
> entry corrupted: Calculated checksum is 926127AE but read checksum is 
> 00000000.
> {code}



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