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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/30648/
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(Updated Feb. 5, 2015, 8:04 p.m.)
Review request for Ambari, Dmitro Lisnichenko, Jonathan Hurley, Nate Cole, Tom
Beerbower, and Yurii Shylov.
Bugs: AMBARI-9485
https://issues.apache.org/jira/browse/AMBARI-9485
Repository: ambari
Description
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Add more debugging information for HDFS prepare and finalize steps.
Prepare:
1. With HA setup, the current code requires the NameNode NOT in safemode when
starting RU.
2. With non-HA setup, the current code requires the NameNode in safemode when
start RU.
The reason is that for non-HA setup, we need to do an extra checkpoint in the
single NN (by calling saveNamespace), which requires the NN to be in safemode
(to avoid namespace modification during the checkpoint). But for HA-setup, the
checkpoint is done by the standby NN, thus we do not need to put the active NN
into the safemode and in this way we can avoid service downtime.
We need to log what the original state is.
Finalize:
This has a confusing message related to
https://issues.apache.org/jira/secure/attachment/12679263/HDFS-7340.001.patch
```
[root@c6404 ~]# su - hdfs -c 'hdfs dfsadmin -rollingUpgrade query'
QUERY rolling upgrade ...
Proceed with rolling upgrade:
Block Pool ID: BP-819970438-192.168.64.104-1423091248521
Start Time: Thu Feb 05 01:15:16 UTC 2015 (=1423098916798)
Finalize Time: <NOT FINALIZED>
[root@c6404 ~]# su - hdfs -c 'hdfs dfsadmin -rollingUpgrade finalize'
FINALIZE rolling upgrade ...
There is no rolling upgrade in progress or rolling upgrade has already been
finalized.
[root@c6404 ~]# su - hdfs -c 'hdfs dfsadmin -rollingUpgrade query'
QUERY rolling upgrade ...
There is no rolling upgrade in progress or rolling upgrade has already been
finalized.
```
This means that the finalize did happen.
We should run another "hdfs dfsadmin -rollingUpgrade query" after finalize to
ensure this happened.
Diffs (updated)
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ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/namenode_upgrade.py
e11546c
Diff: https://reviews.apache.org/r/30648/diff/
Testing
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Installed a 3-node cluster with HDFS and ZK, and Namenode HA, then verified
that Namenode prepare showed the additional output, and that HDFS finalize made
it clear that it did happen.
Unit tests passed.
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 29:57.240s
[INFO] Finished at: Wed Feb 04 18:47:14 PST 2015
[INFO] Final Memory: 60M/496M
[INFO] ------------------------------------------------------------------------
Thanks,
Alejandro Fernandez
