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https://issues.apache.org/jira/browse/HDFS-14075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16694273#comment-16694273
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Ayush Saxena edited comment on HDFS-14075 at 11/21/18 5:50 AM:
---------------------------------------------------------------
Thanx [~elgoiri] for the reviews!!!!
I have handled them all in v6. :)
{quote}Why do we do:
{quote}
This is just to put this fatal occurrence in the Error logs to my knowledge and
belief.
I had doubts too regarding it.As terminate would be logging this too.But it had
different log level.
And for us it is an error for sure.So its here for us.
Went back and checked logSync() too which was mostly handling this exception.
Which we are handling here;it also had similar behavior so I thought its better
be inline with the existing ones.
was (Author: ayushtkn):
Thax [~elgoiri] for the reviews!!!!
I have handled them all in v6. :)
{quote}Why do we do:
{quote}
This is just to put this fatal occurrence in the Error logs to my knowledge and
belief.
I had doubts too regarding it.As terminate would be logging this too.But it had
different log level.
And for us it is an error for sure.So its here for us.
Went back and checked logSync() too which was mostly handling this exception.
Which we are handling here;it also had similar behavior so I thought its better
be inline with the existing ones.
> NPE while Edit Logging
> ----------------------
>
> Key: HDFS-14075
> URL: https://issues.apache.org/jira/browse/HDFS-14075
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Ayush Saxena
> Assignee: Ayush Saxena
> Priority: Critical
> Attachments: HDFS-14075-01.patch, HDFS-14075-02.patch,
> HDFS-14075-03.patch, HDFS-14075-04.patch, HDFS-14075-04.patch,
> HDFS-14075-04.patch, HDFS-14075-05.patch, HDFS-14075-06.patch
>
>
> {noformat}
> 2018-11-10 18:59:38,427 FATAL
> org.apache.hadoop.hdfs.server.namenode.FSEditLog: Exception while edit
> logging: null
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLog.doEditTransaction(FSEditLog.java:481)
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLogAsync$Edit.logEdit(FSEditLogAsync.java:288)
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLogAsync.run(FSEditLogAsync.java:232)
> at java.lang.Thread.run(Thread.java:745)
> 2018-11-10 18:59:38,532 INFO org.apache.hadoop.util.ExitUtil: Exiting with
> status 1: Exception while edit logging: null
> 2018-11-10 18:59:38,552 INFO org.apache.hadoop.hdfs.server.namenode.NameNode:
> SHUTDOWN_MSG:
> {noformat}
> Before NPE Received the following Exception
> {noformat}
> INFO org.apache.hadoop.ipc.Server: IPC Server handler 9 on 65110, call
> Call#23241 Retry#0
> org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol.rollEditLog from
> XXXXXXXX
> java.io.IOException: Unable to start log segment 7964819: too few journals
> successfully started.
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLog.startLogSegment(FSEditLog.java:1385)
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLog.startLogSegmentAndWriteHeaderTxn(FSEditLog.java:1395)
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLog.rollEditLog(FSEditLog.java:1319)
> at
> org.apache.hadoop.hdfs.server.namenode.FSImage.rollEditLog(FSImage.java:1352)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.rollEditLog(FSNamesystem.java:4669)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.rollEditLog(NameNodeRpcServer.java:1293)
> at
> org.apache.hadoop.hdfs.protocolPB.NamenodeProtocolServerSideTranslatorPB.rollEditLog(NamenodeProtocolServerSideTranslatorPB.java:146)
> at
> org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos$NamenodeProtocolService$2.callBlockingMethod(NamenodeProtocolProtos.java:12974)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:524)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:878)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:824)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1729)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2684)
> Caused by: java.io.IOException: starting log segment 7964819 failed for too
> many journals
> at
> org.apache.hadoop.hdfs.server.namenode.JournalSet.mapJournalsAndReportErrors(JournalSet.java:412)
> at
> org.apache.hadoop.hdfs.server.namenode.JournalSet.startLogSegment(JournalSet.java:207)
> at
> org.apache.hadoop.hdfs.server.namenode.FSEditLog.startLogSegment(FSEditLog.java:1383)
> ... 15 more
> {noformat}
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