[jira] [Created] (KUDU-2260) Log block manager should handle null bytes in metadata on crash

["Mike Percy (JIRA)" <ji...@apache.org>]

Mike Percy created KUDU-2260:
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             Summary: Log block manager should handle null bytes in metadata on crash
                 Key: KUDU-2260
                 URL: https://issues.apache.org/jira/browse/KUDU-2260
             Project: Kudu
          Issue Type: Bug
          Components: fs
            Reporter: Mike Percy


The log block manager currently may leave null bytes at the end of the metadata log file if there is a system crash in the middle of a write. The log block manager should detect null bytes at the end of a metadata entry on startup and potentially truncate the entry or close the container.

Currently, it prints an error along the following lines:

{code}
F0111 09:30:27.327011 28843 tablet_server_main.cc:64] Check failed: _s.ok() Bad status: Corruption: Failed to load FS layout: Could not read records from container /data/3/kudu/data/f70391c7c6084e08bbae7448518e0b5e: Data length checksum does not match: Incorrect checksum in file /data/3/kudu/data/f70391c7c6084e08bbae7448518e0b5e.metadata at offset 372533: Checksum does not match. Expected: 0. Actual: 1323915147
{code}

At the time of writing, the workaround for this issue is to truncate the affected file at the start of the incomplete entry in the file. While this may leave orphaned blocks, this should be safe because if the metadata entry was never successfully written then it should not have been considered durable, either.



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