J.Andreina created HDFS-7952:
--------------------------------
Summary: On starting Standby with "rollback" option,
lastPromisedEpoch gets updated and Active Namenode is shutting down.
Key: HDFS-7952
URL: https://issues.apache.org/jira/browse/HDFS-7952
Project: Hadoop HDFS
Issue Type: Bug
Reporter: J.Andreina
Assignee: J.Andreina
Priority: Critical
Step 1: Start NN1 as active , NN2 as standby .
Step 2: Perform "hdfs dfsadmin -rollingUpgrade prepare"
Step 3: Start NN2 active and NN1 as standby with rolling upgrade started option.
Step 4: DN also restarted in upgrade mode and write files to hdfs
Step 5: Stop both Namenode and DN
Step 6: Restart NN2 as active and NN1 as standby with rolling upgrade rollback
option.
Issue:
=====
On restarting NN1 as standby with "rollback" option , lastPromisedEpoch gets
updated and active NN2 is shutting down with following exception.
{noformat}
15/03/18 16:25:56 FATAL namenode.FSEditLog: Error: flush failed for required
journal (JournalAndStream(mgr=QJM to [XXXXXXXXXXX:8485, YYYYYYYYYYY:8485],
stream=QuorumOutputStream starting at txid 22))
org.apache.hadoop.hdfs.qjournal.client.QuorumException: Got too many exceptions
to achieve quorum size 2/2. 2 exceptions thrown:
XXXXXXXXXXX:8485: IPC's epoch 5 is less than the last promised epoch 6
at org.apache.hadoop.hdfs.qjournal.server.Journal.checkRequest(Journal.java:418)
at
org.apache.hadoop.hdfs.qjournal.server.Journal.checkWriteRequest(Journal.java:446)
at org.apache.hadoop.hdfs.qjournal.server.Journal.journal(Journal.java:341)
{noformat}
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