keith-turner commented on code in PR #5652:
URL: https://github.com/apache/accumulo/pull/5652#discussion_r2155382782
##########
server/tserver/src/main/java/org/apache/accumulo/tserver/tablet/Tablet.java:
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@@ -2220,6 +2220,10 @@ public MetadataUpdateCount getUpdateCount() {
return getDatafileManager().getUpdateCount();
}
+ public void removeOrphanedScanRefs() {
+ getDatafileManager().removeOrphanedScanRefs();
+ }
Review Comment:
We want to avoid writing to the metadata table after a tablet is closed
because the rest of the system assumes that once a tablet is unloaded it will
not write. The following change does two things it checks if the tablet is
closed and if its not closed it increments writesInProgress to make
Tablet.close() wait until this completes (the bulk import code also may modify
the metadata table and does the same thing).
```suggestion
public void removeOrphanedScanRefs() {
synchronized (this){
if(isClosed() || isClosing()) {
return;
}
incrementWritesInProgress();
}
try {
getDatafileManager().removeOrphanedScanRefs();
}finally {
decrementWritesInProgress();
}
}
```
Overall this code and the code in DataFileManager is unlocking and lock the
tablet object a lot, but not sure if that could be improved w/o large changes
to the code (which could introduce bugs).
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