cndaimin commented on a change in pull request #3548:
URL: https://github.com/apache/hadoop/pull/3548#discussion_r728860506
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File path:
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/util/StripedBlockUtil.java
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@@ -245,8 +245,7 @@ public static long getSafeLength(ErasureCodingPolicy
ecPolicy,
Arrays.sort(cpy);
// full stripe is a stripe has at least dataBlkNum full cells.
// lastFullStripeIdx is the index of the last full stripe.
- int lastFullStripeIdx =
- (int) (cpy[cpy.length - dataBlkNum] / cellSize);
+ long lastFullStripeIdx = cpy[cpy.length - dataBlkNum] / cellSize;
Review comment:
Many thanks for the review! @sodonnel
1. My understanding to this why not pick the first one is that the EC
background reconstruction procedure has the ability to compute the rest 2
blocks based on the 3 good blocks(take RS-3-2 policy for example).
2. I did notice a todo in code comments of this method: "Include
lastFullStripeIdx+1 stripe in safeLength, if there exists such a stripe (and it
must be partial).", but I might not involve this since that work may take a
while :(
3. `cellIdxInBlk * cellSize * dataBlkNum` in `offsetInBlkToOffsetInBG` has
the same problem, I am glad to fix that too.
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