Fei Hui created HDFS-14396:
------------------------------
Summary: Failed to load image from FSImageFile when downgrade from
3.x to 2.x
Key: HDFS-14396
URL: https://issues.apache.org/jira/browse/HDFS-14396
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Fei Hui
After fixing HDFS-13596, try to downgrade from 3.x to 2.x. But namenode can't
start because exception occurs. The message follows
{code:java}
2019-01-23 17:22:18,730 ERROR org.apache.hadoop.hdfs.server.namenode.FSImage:
Failed to load image from
FSImageFile(file=/data1/hadoopdata/hadoop-namenode/current/fsimage_0000000000000025310,
cpktTxId=0000000000
000025310)
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf$Loader.loadInternal(FSImageFormatProtobuf.java:243)
at
org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf$Loader.load(FSImageFormatProtobuf.java:179)
at
org.apache.hadoop.hdfs.server.namenode.FSImageFormat$LoaderDelegator.load(FSImageFormat.java:226)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:885)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:869)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImageFile(FSImage.java:742)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:673)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:290)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:998)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:700)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:612)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:672)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:839)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:823)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1517)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1583)
2019-01-23 17:22:19,023 WARN
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Encountered exception
loading fsimage
java.io.IOException: Failed to load FSImage file, see error(s) above for more
info.
at
org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:688)
at
org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:290)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:998)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:700)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:612)
{code}
This issue occurs because 3.x namenode saves image with EC fields during upgrade
Try to fix it
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