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https://issues.apache.org/jira/browse/HDFS-1057?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12883785#action_12883785
]
sam rash commented on HDFS-1057:
--------------------------------
from the raw console output of hudson:
[exec] [junit] Tests run: 3, Failures: 0, Errors: 1, Time elapsed:
0.624 sec
[exec] [junit] Test
org.apache.hadoop.hdfs.security.token.block.TestBlockToken FAILED
--
[exec] [junit] Tests run: 1, Failures: 0, Errors: 1, Time elapsed:
0.706 sec
[exec] [junit] Test org.apache.hadoop.hdfs.server.common.TestJspHelper
FAILED
--
[exec] [junit] Tests run: 1, Failures: 0, Errors: 1, Time elapsed:
28.477 sec
[exec] [junit] Test org.apache.hadoop.hdfsproxy.TestHdfsProxy FAILED
I ran the tests locally and the first 2 succeed. The third fails on the latest
trunk without hdfs-1057. I think from the test perspective, this is safe to
commit.
1. TestBlockToken
run-test-hdfs:
[delete] Deleting directory
/data/users/srash/apache/hadoop-hdfs/build/test/data
[mkdir] Created dir: /data/users/srash/apache/hadoop-hdfs/build/test/data
[delete] Deleting directory
/data/users/srash/apache/hadoop-hdfs/build/test/logs
[mkdir] Created dir: /data/users/srash/apache/hadoop-hdfs/build/test/logs
[junit] WARNING: multiple versions of ant detected in path for junit
[junit]
jar:file:/usr/local/ant/lib/ant.jar!/org/apache/tools/ant/Project.class
[junit] and
jar:file:/home/srash/.ivy2/cache/ant/ant/jars/ant-1.6.5.jar!/org/apache/tools/ant/Project.class
[junit] Running org.apache.hadoop.hdfs.security.token.block.TestBlockToken
[junit] Tests run: 3, Failures: 0, Errors: 0, Time elapsed: 1.248 sec
2. TestJspHelper
run-test-hdfs:
[delete] Deleting directory
/data/users/srash/apache/hadoop-hdfs/build/test/data
[mkdir] Created dir: /data/users/srash/apache/hadoop-hdfs/build/test/data
[delete] Deleting directory
/data/users/srash/apache/hadoop-hdfs/build/test/logs
[mkdir] Created dir: /data/users/srash/apache/hadoop-hdfs/build/test/logs
[junit] WARNING: multiple versions of ant detected in path for junit
[junit]
jar:file:/usr/local/ant/lib/ant.jar!/org/apache/tools/ant/Project.class
[junit] and
jar:file:/home/srash/.ivy2/cache/ant/ant/jars/ant-1.6.5.jar!/org/apache/tools/ant/Project.class
[junit] Running org.apache.hadoop.hdfs.server.common.TestJspHelper
[junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 1.275 sec
> Concurrent readers hit ChecksumExceptions if following a writer to very end
> of file
> -----------------------------------------------------------------------------------
>
> Key: HDFS-1057
> URL: https://issues.apache.org/jira/browse/HDFS-1057
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: data-node
> Affects Versions: 0.20-append, 0.21.0, 0.22.0
> Reporter: Todd Lipcon
> Assignee: sam rash
> Priority: Blocker
> Fix For: 0.20-append
>
> Attachments: conurrent-reader-patch-1.txt,
> conurrent-reader-patch-2.txt, conurrent-reader-patch-3.txt,
> HDFS-1057-0.20-append.patch, hdfs-1057-trunk-1.txt, hdfs-1057-trunk-2.txt,
> hdfs-1057-trunk-3.txt, hdfs-1057-trunk-4.txt, hdfs-1057-trunk-5.txt,
> hdfs-1057-trunk-6.txt
>
>
> In BlockReceiver.receivePacket, it calls replicaInfo.setBytesOnDisk before
> calling flush(). Therefore, if there is a concurrent reader, it's possible to
> race here - the reader will see the new length while those bytes are still in
> the buffers of BlockReceiver. Thus the client will potentially see checksum
> errors or EOFs. Additionally, the last checksum chunk of the file is made
> accessible to readers even though it is not stable.
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