dlmarion commented on code in PR #5998:
URL: https://github.com/apache/accumulo/pull/5998#discussion_r2593565769
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server/tserver/src/main/java/org/apache/accumulo/tserver/tablet/ScanDataSource.java:
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@@ -177,8 +177,10 @@ private SortedKeyValueIterator<Key,Value> createIterator()
files = reservation.getSecond();
}
- Collection<InterruptibleIterator> mapfiles =
+ List<InterruptibleIterator> mapfiles =
fileManager.openFiles(files, scanParams.isIsolated(), samplerConfig);
+ // Randomize the ordering of files to avoid block cache contention on seeks
+ Collections.shuffle(mapfiles);
Review Comment:
I think you can use `tablet.getTableConfiguration()` to see if a shuffle
property is set on the table. Another option, which is not currently wired up,
would be to use an execution hint on a per-scan basis so that not all scans on
the table are affected.
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