Juan Yu created KUDU-1830:
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Summary: Reduce Kudu WAL log disk usage
Key: KUDU-1830
URL: https://issues.apache.org/jira/browse/KUDU-1830
Project: Kudu
Issue Type: Improvement
Reporter: Juan Yu
WAL log can take significent disk space. So far there are some config to limit
it. but it can go very high.
WAL log size = #tablets * log_segment_size_mb * log segments (1 if there is
write ops to this tablet, can go up to log_max_segments_to_retain)
Logs are retained even if there is no write for a while.
We could reduce the WAL log usage by
- reduce min_segments_to_retain to 1 instead of 2, a
- reduce steady state consumption of idle tablets, roll a WAL if it has had no
writes for a few minutes and size more than a MB or two so that "idle" tablets
have 0 WAL space consumed
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