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https://issues.apache.org/jira/browse/HDFS-8320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14544852#comment-14544852
 ] 

Hadoop QA commented on HDFS-8320:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  14m 38s | Pre-patch HDFS-7285 compilation 
is healthy. |
| {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 3 new or modified test files. |
| {color:green}+1{color} | javac |   7m 31s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 40s | There were no new javadoc 
warning messages. |
| {color:red}-1{color} | release audit |   0m 15s | The applied patch generated 
1 release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 37s | There were no new checkstyle 
issues. |
| {color:green}+1{color} | whitespace |   0m  2s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 37s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 40s | The patch built with 
eclipse:eclipse. |
| {color:red}-1{color} | findbugs |   3m 13s | The patch appears to introduce 6 
new Findbugs (version 2.0.3) warnings. |
| {color:green}+1{color} | native |   3m 12s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests | 190m  5s | Tests failed in hadoop-hdfs. |
| | | 231m 34s | |
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|| Reason || Tests ||
| FindBugs | module:hadoop-hdfs |
|  |  Inconsistent synchronization of 
org.apache.hadoop.hdfs.DFSOutputStream.streamer; locked 89% of time  
Unsynchronized access at DFSOutputStream.java:89% of time  Unsynchronized 
access at DFSOutputStream.java:[line 146] |
|  |  Possible null pointer dereference of arr$ in 
org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoStripedUnderConstruction.initializeBlockRecovery(long)
  Dereferenced at BlockInfoStripedUnderConstruction.java:arr$ in 
org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoStripedUnderConstruction.initializeBlockRecovery(long)
  Dereferenced at BlockInfoStripedUnderConstruction.java:[line 194] |
|  |  Unread field:field be static?  At ErasureCodingWorker.java:[line 252] |
|  |  Should 
org.apache.hadoop.hdfs.server.datanode.erasurecode.ErasureCodingWorker$StripedReader
 be a _static_ inner class?  At ErasureCodingWorker.java:inner class?  At 
ErasureCodingWorker.java:[lines 913-915] |
|  |  Found reliance on default encoding in 
org.apache.hadoop.hdfs.server.namenode.ErasureCodingZoneManager.createErasureCodingZone(String,
 ECSchema):in 
org.apache.hadoop.hdfs.server.namenode.ErasureCodingZoneManager.createErasureCodingZone(String,
 ECSchema): String.getBytes()  At ErasureCodingZoneManager.java:[line 117] |
|  |  Found reliance on default encoding in 
org.apache.hadoop.hdfs.server.namenode.ErasureCodingZoneManager.getECZoneInfo(INodesInPath):in
 
org.apache.hadoop.hdfs.server.namenode.ErasureCodingZoneManager.getECZoneInfo(INodesInPath):
 new String(byte[])  At ErasureCodingZoneManager.java:[line 81] |
| Failed unit tests | hadoop.tracing.TestTraceAdmin |
|   | hadoop.hdfs.server.blockmanagement.TestBlockInfo |
|   | hadoop.hdfs.TestWriteReadStripedFile |
|   | hadoop.hdfs.TestEncryptionZonesWithKMS |
|   | hadoop.hdfs.server.namenode.TestFileTruncate |
|   | hadoop.hdfs.server.datanode.TestDataNodeVolumeFailureToleration |
|   | hadoop.hdfs.TestRecoverStripedFile |
|   | hadoop.hdfs.server.datanode.TestIncrementalBlockReports |
|   | 
hadoop.hdfs.tools.offlineImageViewer.TestOfflineImageViewerWithStripedBlocks |
|   | hadoop.hdfs.server.datanode.TestTriggerBlockReport |
|   | hadoop.hdfs.server.namenode.TestAuditLogs |
|   | hadoop.hdfs.server.datanode.TestBlockReplacement |
|   | hadoop.hdfs.tools.TestHdfsConfigFields |
|   | hadoop.hdfs.server.blockmanagement.TestBlockManager |
|   | hadoop.hdfs.server.blockmanagement.TestReplicationPolicy |
| Timed out tests | org.apache.hadoop.hdfs.TestDatanodeDeath |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12732984/HDFS-8320-HDFS-7285.00.patch
 |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | HDFS-7285 / a35936d |
| Release Audit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/10992/artifact/patchprocess/patchReleaseAuditProblems.txt
 |
| Findbugs warnings | 
https://builds.apache.org/job/PreCommit-HDFS-Build/10992/artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
 |
| hadoop-hdfs test log | 
https://builds.apache.org/job/PreCommit-HDFS-Build/10992/artifact/patchprocess/testrun_hadoop-hdfs.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/10992/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf907.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/10992/console |


This message was automatically generated.

> Erasure coding: consolidate striping-related terminologies
> ----------------------------------------------------------
>
>                 Key: HDFS-8320
>                 URL: https://issues.apache.org/jira/browse/HDFS-8320
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-8320-HDFS-7285.00.patch
>
>
> Right now we are doing striping-based I/O in a number of places:
> # Client output stream (HDFS-7889)
> # Client input stream
> #* pread (HDFS-7782, HDFS-7678)
> #* stateful read (HDFS-8033, HDFS-8281, HDFS-8319)
> # DN reconstruction (HDFS-7348)
> In each place we use one or multiple of the following terminologies:
> # Cell
> # Stripe
> # Block group
> # Internal block
> # Chunk
> This JIRA aims to systematically define these terminologies in relation with 
> each other and in the context of the containing file. For example, a cell 
> belong to stripe _i_ and internal block _j_ can be indexed as {{(i, j)}} and 
> its logical index _k_ in the file can be calculated.
> With the above consolidation, hopefully we can further consolidate striping 
> I/O codes.



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