Andrew Wong created KUDU-3228:
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Summary: Background process that checks for corrupted block and
failed disks
Key: KUDU-3228
URL: https://issues.apache.org/jira/browse/KUDU-3228
Project: Kudu
Issue Type: Improvement
Components: cfile, fs, tserver
Reporter: Andrew Wong
Currently, CFile corruption and failed disks will result in any bad tablets
being marked as failed, being re-replicated elsewhere, and any scans that were
in progress for them being retried at other servers.
Rather than waiting for the first bad access to do this, we may want to
implement a background task that checks for corruption and proactively
re-replicates such tablets. That way, especially when there are long periods of
client inactivity, we can the faulty-hardware-related re-replication out of the
way.
The task should probably only run when the tserver isn't serving many scans or
writes. It should also avoid polluting the block cache, if attempting to check
for CFile corruption.
HDFS has a "disk checker" task that may be worth drawing inspiration from.
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