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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12575) Improve test coverage for EC related edit logs ops
Date Mon, 02 Oct 2017 18:30:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16188574#comment-16188574
] 

Lei (Eddy) Xu commented on HDFS-12575:
--------------------------------------

[~drankye], [~Sammi] Could you take a look.

> 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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