Wei-Chiu Chuang created HDFS-14615:
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Summary: NPE writing edit logs
Key: HDFS-14615
URL: https://issues.apache.org/jira/browse/HDFS-14615
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 3.1.1
Reporter: Wei-Chiu Chuang
Hit a weird bug where writing mkdir op to edit log throws an NPE and NameNode
crashed
{noformat}
2019-06-26 10:57:27,398 ERROR org.apache.hadoop.hdfs.server.namenode.FSEditLog:
Error: write op failed for (journal
JournalAndStream(mgr=FileJournalManager(root=/ssd/work/src/upstream/impala/testdata/cluster/cdh6/node-1/data/dfs/nn),
stream=EditLogFileOutputStream(/ssd/work/src/upstream/impala/testdata/cluster/cdh6/node-1/data/dfs/nn/current/edits_inprogress_0000000000000598588)))
java.lang.NullPointerException
at org.apache.hadoop.io.Text.encode(Text.java:451)
at org.apache.hadoop.io.Text.encode(Text.java:431)
at org.apache.hadoop.io.Text.writeString(Text.java:491)
at
org.apache.hadoop.fs.permission.PermissionStatus.write(PermissionStatus.java:104)
at
org.apache.hadoop.fs.permission.PermissionStatus.write(PermissionStatus.java:84)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogOp$MkdirOp.writeFields(FSEditLogOp.java:1654)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogOp$Writer.writeOp(FSEditLogOp.java:4866)
at
org.apache.hadoop.hdfs.server.namenode.EditsDoubleBuffer$TxnBuffer.writeOp(EditsDoubleBuffer.java:157)
at
org.apache.hadoop.hdfs.server.namenode.EditsDoubleBuffer.writeOp(EditsDoubleBuffer.java:60)
at
org.apache.hadoop.hdfs.server.namenode.EditLogFileOutputStream.write(EditLogFileOutputStream.java:97)
at
org.apache.hadoop.hdfs.server.namenode.JournalSet$JournalSetOutputStream$1.apply(JournalSet.java:444)
at
org.apache.hadoop.hdfs.server.namenode.JournalSet.mapJournalsAndReportErrors(JournalSet.java:385)
at
org.apache.hadoop.hdfs.server.namenode.JournalSet.access$100(JournalSet.java:55)
at
org.apache.hadoop.hdfs.server.namenode.JournalSet$JournalSetOutputStream.write(JournalSet.java:440)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLog.doEditTransaction(FSEditLog.java:481)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogAsync$Edit.logEdit(FSEditLogAsync.java:288)
at
org.apache.hadoop.hdfs.server.namenode.FSEditLogAsync.run(FSEditLogAsync.java:232)
{noformat}
The stacktrace is similar to SENTRY-555, which is thought to be a Sentry bug
(authorization provider), but this cluster doesn't have Sentry and therefore
could be a genuine HDFS bug.
File this jira to keep a record.
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