[HDFS-6137] Datanode cannot rollback because LayoutVersion incorrect

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.0.5-alpha
• Component/s: datanode
• Assignee: Unassigned
• Reporter: Fengdong Yu
• Created: 21/Mar/14 10:36
• Updated: 08/Oct/14 04:16

Description

upgrade from hadoop-2.0.5-alpha(QJM HA enabled) to the lastest trunk(HA disabled), which is successful. then stop the cluster, and rollback, then it throw exception:

2014-03-21 18:33:19,384 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for block pool Block pool BP-1123524590-10.204.8.135-1395397158134 (storage id DS-1123524590-10.204.8.135-50010-1395397185148) service to 10-204-8-135/10.204.8.135:9000
org.apache.hadoop.hdfs.server.common.IncorrectVersionException: Unexpected version of storage directory /data/hdfs/data/current/BP-1123524590-10.204.8.135-1395397158134. Reported: -55. Expecting = -40.
        at org.apache.hadoop.hdfs.server.common.Storage.setLayoutVersion(Storage.java:1083)
        at org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceStorage.setFieldsFromProperties(BlockPoolSliceStorage.java:217)
        at org.apache.hadoop.hdfs.server.common.Storage.readProperties(Storage.java:922)
        at org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceStorage.doTransition(BlockPoolSliceStorage.java:244)
        at org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceStorage.recoverTransitionRead(BlockPoolSliceStorage.java:145)
        at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:234)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:913)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:884)
        at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:280)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:222)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
        at java.lang.Thread.run(Thread.java:744)

I looked at the datanode dir, $datanode.dir/VERSION is always new, when we upgrade, this file was overwrited, so it MUST fail during rollback.

Issue Links

• relates to: HDFS-5526 Datanode cannot roll back to previous layout version