Todd Lipcon created KUDU-1968:
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Summary: Aborted tablet copies delete live blocks
Key: KUDU-1968
URL: https://issues.apache.org/jira/browse/KUDU-1968
Project: Kudu
Issue Type: Bug
Components: tserver
Affects Versions: 1.3.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Blocker
72541b47eb55b2df4eab5d6050f517476ed6d370 (KUDU-1853) caused a serious
regression in the case of a failed tablet copy. As of that patch, the following
sequence happens:
- we fetch the remote tablet's metadata, and set our local metadata to match it
(including the remote block IDs)
- as we download blocks, we replace remote block ids with local block IDs
- if we fail in the middle, we call DeleteTablet
-- this means that, since we still have some remote block IDs in the metadata,
the DeleteTablet call deletes local blocks based on remote block IDs. These
block ids are likely to belong to other live tablets locally!
This can cause pretty serious dataloss, and has the tendency to cascade around
a cluster, since later attempts to copy a tablet with missing blocks will get
aborted as well.
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