Hi,
I do not clearly understand how the dfs compare blocks.
The blockId is randomly generated but the compare method looks like:
if (getBlockId() < b.getBlockId()) {
return -1;
} else if (getBlockId() == b.getBlockId()) {
return 0;
} else {
return 1;
}
That wouldn't be a big problem if this would be used in the
FSNamesystem#processBlock
if (cmp == 0) {
// Do nothing, blocks are the same
...
} else if (cmp < 0) {
// The old report has a block the new one does not
removeStoredBlock(oldReport[oldPos], node);
...
} else {
// The new report has a block the old one does not
addStoredBlock(newReport[newPos], node);
I currently just miss some glue how result of a compare of two random
numbers can be used to decide if a block can be removed or not.
Any hints what I'm missing?
Thanks.
Stefan
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