[ 
https://issues.apache.org/jira/browse/HDFS-9250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14959561#comment-14959561
 ] 

Hadoop QA commented on HDFS-9250:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  20m 24s | Pre-patch trunk has 1 extant 
Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 1 new or modified test files. |
| {color:green}+1{color} | javac |   8m  3s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  10m 27s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 25s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   2m 57s | There were no new checkstyle 
issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 31s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 36s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   4m 36s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m 15s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests |  50m 26s | Tests failed in hadoop-hdfs. |
| {color:green}+1{color} | hdfs tests |   0m 32s | Tests passed in 
hadoop-hdfs-client. |
| | | 103m 17s | |
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|| Reason || Tests ||
| Failed unit tests | hadoop.hdfs.TestBlockStoragePolicy |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12766835/HDFS-9250.001.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 8d2d3eb |
| Pre-patch Findbugs warnings | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13006/artifact/patchprocess/trunkFindbugsWarningshadoop-hdfs.html
 |
| hadoop-hdfs test log | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13006/artifact/patchprocess/testrun_hadoop-hdfs.txt
 |
| hadoop-hdfs-client test log | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13006/artifact/patchprocess/testrun_hadoop-hdfs-client.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13006/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf903.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/13006/console |


This message was automatically generated.

> LocatedBlock#addCachedLoc may throw ArrayStoreException when cache is empty
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-9250
>                 URL: https://issues.apache.org/jira/browse/HDFS-9250
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: HDFS
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: HDFS-9250.001.patch
>
>
> We may see the following exception:
> {noformat}
> java.lang.ArrayStoreException
> at java.util.ArrayList.toArray(ArrayList.java:389)
> at 
> org.apache.hadoop.hdfs.protocol.LocatedBlock.addCachedLoc(LocatedBlock.java:205)
> at 
> org.apache.hadoop.hdfs.server.namenode.CacheManager.setCachedLocations(CacheManager.java:907)
> at 
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocationsUpdateTimes(FSNamesystem.java:1974)
> at 
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocationsInt(FSNamesystem.java:1873)
> {noformat}
> The cause is that in LocatedBlock.java, when {{addCachedLoc}}:
> - Passed in parameter {{loc}}, which is type {{DatanodeDescriptor}}, is added 
> to {{cachedList}}
> - {{cachedList}} was assigned to {{EMPTY_LOCS}}, which is type 
> {{DatanodeInfoWithStorage}}.
> Both {{DatanodeDescriptor}} and {{DatanodeInfoWithStorage}} are subclasses of 
> {{DatanodeInfo}} but do not inherit from each other, resulting in the 
> ArrayStoreException.



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