Eric Lin created HDFS-15012:
-------------------------------
Summary: NN fails to parse Edit logs after applying HDFS-13101
Key: HDFS-15012
URL: https://issues.apache.org/jira/browse/HDFS-15012
Project: Hadoop HDFS
Issue Type: Bug
Components: nn
Reporter: Eric Lin
After applying HDFS-13101, and deleting and creating large number of snapshots,
SNN exited with below error:
{code:shell}
2019-11-18 08:28:06,528 ERROR
org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader: Encountered exception
on operation DeleteSnapshotOp [snapshotRoot=/path/to/hdfs/file,
snapshotName=distcp-3479-31-old,
RpcClientId=b16a6cb5-bdbb-45ae-9f9a-f7dc57931f37, Rpc
CallId=1]
java.lang.AssertionError: Element already exists:
element=partition_isactive=true, DELETED=[partition_isactive=true]
at org.apache.hadoop.hdfs.util.Diff.insert(Diff.java:193)
at org.apache.hadoop.hdfs.util.Diff.delete(Diff.java:239)
at org.apache.hadoop.hdfs.util.Diff.combinePosterior(Diff.java:462)
at
org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature$DirectoryDiff$2.initChildren(DirectoryWithSnapshotFeature.java:240)
at
org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature$DirectoryDiff$2.iterator(DirectoryWithSnapshotFeature.java:250)
at
org.apache.hadoop.hdfs.server.namenode.INodeDirectory.cleanSubtreeRecursively(INodeDirectory.java:755)
at
org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature.cleanDirectory(DirectoryWithSnapshotFeature.java:753)
at
org.apache.hadoop.hdfs.server.namenode.INodeDirectory.cleanSubtree(INodeDirectory.java:790)
at
org.apache.hadoop.hdfs.server.namenode.INodeReference.cleanSubtree(INodeReference.java:332)
at
org.apache.hadoop.hdfs.server.namenode.INodeReference$WithName.cleanSubtree(INodeReference.java:583)
at
org.apache.hadoop.hdfs.server.namenode.INodeDirectory.cleanSubtreeRecursively(INodeDirectory.java:760)
at
org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature.cleanDirectory(DirectoryWithSnapshotFeature.java:753)
at
org.apache.hadoop.hdfs.server.namenode.INodeDirectory.cleanSubtree(INodeDirectory.java:790)
at
org.apache.hadoop.hdfs.server.namenode.snapshot.DirectorySnapshottableFeature.removeSnapshot(DirectorySnapshottableFeature.java:235)
at
org.apache.hadoop.hdfs.server.namenode.INodeDirectory.removeSnapshot(INodeDirectory.java:259)
at
org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager.deleteSnapshot(SnapshotManager.java:301)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.applyEditLogOp(FSEditLogLoader.java:688)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:232)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:141)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:903)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:756)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:324)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1144)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:796)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:614)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:676)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:844)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:823)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1547)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1615)
{code}
We confirmed that fsimage and edit files were NOT corrupted, as reverting
HDFS-13101 fixed the issue. So the logic introduced in HDFS-13101 is broken and
failed to parse edit log files.
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