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https://issues.apache.org/jira/browse/HDFS-15875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hui Fei resolved HDFS-15875.
----------------------------
Fix Version/s: 3.4.0
Resolution: Fixed
> Check whether file is being truncated before truncate
> -----------------------------------------------------
>
> Key: HDFS-15875
> URL: https://issues.apache.org/jira/browse/HDFS-15875
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.3.0, 3.1.4, 3.2.2
> Reporter: Hui Fei
> Assignee: Hui Fei
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> We have got this problem.
> * A job sends truncate to namenode, and the block recovery goes.
> * DataNode D is timeout while it connects another datanode (60s), so block
> recovery costs 60+s
> * A job tails, and B job starts and it sends truncate to namenode. New
> recoveryId generates during recovery lease.
> * DataNode D commitBlockSynchronization and get errors "does not match
> current recovery id"
> So truncate will not complete forever. Datanode D has replica with new length
> and two other datanodes have replica old length.
> DN has the error messages "Inconsistent size of finalized replicas"
> the related code is in BlockRecoveryWorker.java
> {code}
> for (BlockRecord r : syncList) {
> assert r.rInfo.getNumBytes() > 0 : "zero length replica";
> ReplicaState rState = r.rInfo.getOriginalReplicaState();
> if (rState.getValue() < bestState.getValue()) {
> bestState = rState;
> }
> if(rState == ReplicaState.FINALIZED) {
> if (finalizedLength > 0 && finalizedLength != r.rInfo.getNumBytes()) {
> throw new IOException("Inconsistent size of finalized replicas. " +
> "Replica " + r.rInfo + " expected size: " + finalizedLength);
> }
> finalizedLength = r.rInfo.getNumBytes();
> }
> }
> {code}
>
>
> {code:java}
> {code}
>
>
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