Keith Turner created ACCUMULO-1152:
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Summary: Add more sanity checks to limit the damage of multiple
assignment
Key: ACCUMULO-1152
URL: https://issues.apache.org/jira/browse/ACCUMULO-1152
Project: Accumulo
Issue Type: Improvement
Reporter: Keith Turner
Fix For: 1.6.0
When an issue like ACCUMULO-954 comes along and causes a tablet to be hosted on
multiple tablet servers, its nice to have sanity checks that limit the damage
this can cause.
Accumulo already has a sanity check on writes to the metadata table that
ensures the tablet server making the write still holds a lock. This has
reliably triggered in cases of multiple assignment bugs. It would be nice to
have more checks like this. Below are some places I think checks would be
useful, are there more?
* Tserver attempts to positively check it holds its lock before getting a new
walog.
* Clients take some action to clear lockless tservers from their metadata
table cache. This would help prevent writing data to a zombie tserver that may
lose data, or reading stale data from a zombie tserver.
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