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https://issues.apache.org/jira/browse/HDFS-6325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995918#comment-13995918
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Keith Pak commented on HDFS-6325:
---------------------------------
testFileAppend4 failure:
There may be an overlap of shutdown of testAppendInsufficientLocations and
startup of testCompleteOtherLeaseHoldersFile.
I changed testAppendInsufficientLocations to use the field variable "cluster"
instead of creating my own as a local variable and also reduced the number of
DNs from 6 to 4. Otherwise, I see that testCompleteOtherLeaseHoldersFile is
progressing so I think a bigger timeout may be required as stated in this JIRA:
https://issues.apache.org/jira/browse/HADOOP-8596.
TestBalancerWithNodeGroup:
This also seems to be an intermittent issue from
https://issues.apache.org/jira/browse/HDFS-6250.
> Append should fail if the last block has insufficient number of replicas
> ------------------------------------------------------------------------
>
> Key: HDFS-6325
> URL: https://issues.apache.org/jira/browse/HDFS-6325
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.2.0
> Reporter: Konstantin Shvachko
> Assignee: Keith Pak
> Attachments: HDFS-6325.patch, HDFS-6325.patch, HDFS-6325.patch,
> HDFS-6325_test.patch, appendTest.patch
>
>
> Currently append() succeeds on a file with the last block that has no
> replicas. But the subsequent updatePipeline() fails as there are no replicas
> with the exception "Unable to retrieve blocks locations for last block". This
> leaves the file unclosed, and others can not do anything with it until its
> lease expires.
> The solution is to check replicas of the last block on the NameNode and fail
> during append() rather than during updatePipeline().
> How many replicas should be present before NN allows to append? I see two
> options:
> # min-replication: allow append if the last block is minimally replicated (1
> by default)
> # full-replication: allow append if the last block is fully replicated (3 by
> default)
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