Details
Critical Description
A Jenkins build we have running failed twice in a row with issues form TestFileAppend4.testAppendSyncReplication1 in an attempt to reproduce the error I ran TestFileAppend4 in a loop over night saving the results away. (No clean was done in between test runs)
When TestFileAppend4 is run in a loop the testAppendSyncReplication[012] tests fail about 10% of the time (14 times out of 130 tries) They all fail with something like the following. Often it is only one of the tests that fail, but I have seen as many as two fail in one run.
Testcase: testAppendSyncReplication2 took 32.198 sec
FAILED
Should have 2 replicas for that block, not 1
junit.framework.AssertionFailedError: Should have 2 replicas for that block, not 1
at org.apache.hadoop.hdfs.TestFileAppend4.replicationTest(TestFileAppend4.java:477)
at org.apache.hadoop.hdfs.TestFileAppend4.testAppendSyncReplication2(TestFileAppend4.java:425)
I also saw several other tests that are a part of TestFileApped4 fail during this experiment. They may all be related to one another so I am filing them in the same JIRA. If it turns out that they are not related then they can be split up later.
testAppendSyncBlockPlusBbw failed 6 out of the 130 times or about 5% of the time
Testcase: testAppendSyncBlockPlusBbw took 1.633 sec
FAILED
unexpected file size! received=0 , expected=1024
junit.framework.AssertionFailedError: unexpected file size! received=0 , expected=1024
at org.apache.hadoop.hdfs.TestFileAppend4.assertFileSize(TestFileAppend4.java:136)
at org.apache.hadoop.hdfs.TestFileAppend4.testAppendSyncBlockPlusBbw(TestFileAppend4.java:401)
testAppendSyncChecksum[012] failed 2 out of the 130 times or about 1.5% of the time
Testcase: testAppendSyncChecksum1 took 32.385 sec
FAILED
Should have 1 replica for that block, not 2
junit.framework.AssertionFailedError: Should have 1 replica for that block, not 2
at org.apache.hadoop.hdfs.TestFileAppend4.checksumTest(TestFileAppend4.java:556)
at org.apache.hadoop.hdfs.TestFileAppend4.testAppendSyncChecksum1(TestFileAppend4.java:500)
I will attach logs for all of the failures. Be aware that I did change some of the logging messages in this test so I could better see when testAppendSyncReplication started and ended. Other then that the code is stock 0.20.205 RC2