[jira] [Created] (HDFS-12575) Improve test coverage for EC related edit logs ops

["Lei (Eddy) Xu (JIRA)" <ji...@apache.org>]

Lei (Eddy) Xu created HDFS-12575:
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             Summary: Improve test coverage for EC related edit logs ops
                 Key: HDFS-12575
                 URL: https://issues.apache.org/jira/browse/HDFS-12575
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: erasure-coding
    Affects Versions: 3.0.0-alpha4
            Reporter: Lei (Eddy) Xu
            Assignee: SammiChen


HDFS-12569 found that we have little test coverage for edit logs ops of erasure coding.

And we've seen the following bug bring down SNN in our test environments:

{code}
6:42:18.177 AM	ERROR	FSEditLogLoader	
Encountered exception on operation AddBlockOp [path=/tmp/foo/bar, penultimateBlock=NULL, lastBlock=blk_1073743386_69322, RpcClientId=, RpcCallId=-2]
java.lang.IllegalArgumentException: reportedBlock is not striped
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
	at 
....
6:42:18.190 AM	FATAL	EditLogTailer	
Unknown error encountered while tailing edits. Shutting down standby NN.
java.io.IOException: java.lang.IllegalArgumentException: reportedBlock is not striped
	at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:251)
	at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:150)
	at org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:882)
	at org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:863)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer.doTailEdits(EditLogTailer.java:293)
	at 
{code}
We should add coverage for these important edit logs, i.e., set/unset policy, enable/remove policies and etc are correctly persisted in edit logs, and test the scenarios like:

* Restart NN
* Replay edits after checkpoint
* Apply edits on SNN.
* and etc. 



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