milleruntime commented on issue #2179:
URL: https://github.com/apache/accumulo/issues/2179#issuecomment-867763969
I tested an upgrade in Uno with some data and sorted WAL files. I was
surprised to not see any errors trying to recover the old map files. I noticed
that the GC deleted the files rather quickly after the Upgrader was finished.
<pre>
11:49:32 {main} ~/workspace/uno/install/logs/accumulo$ grep
980ce402-07dc-4a09-b6ac-e26664db29a3 *
gc_ip-10-113-12-25.log:2021-06-24T11:08:05,957
[gc.GarbageCollectWriteAheadLogs] DEBUG: Removing CLOSED WAL
hdfs://localhost:8020/accumulo/wal/ip-10-113-12-25+9997/980ce402-07dc-4a09-b6ac-e26664db29a3
gc_ip-10-113-12-25.log:2021-06-24T11:08:05,965
[gc.GarbageCollectWriteAheadLogs] DEBUG: Removing recovery log
hdfs://localhost:8020/accumulo/recovery/980ce402-07dc-4a09-b6ac-e26664db29a3
gc_ip-10-113-12-25.log:2021-06-24T11:08:05,979 [log.WalStateManager] DEBUG:
Removing 980ce402-07dc-4a09-b6ac-e26664db29a3
</pre>
I am going to try the test again but use CI to make sure there wasn't data
any data loss.
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