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https://issues.apache.org/jira/browse/HBASE-2645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487935#comment-13487935
]
Ted Yu commented on HBASE-2645:
-------------------------------
{code}
r1403977 | stack | 2012-10-30 21:48:37 -0700 (Tue, 30 Oct 2012) | 1 line
HLog writer can do 1-2 sync operations after lease has been recovered for split
process.
{code}
I don't see JIRA number in the checkin message.
Second, in
https://builds.apache.org/job/PreCommit-HBASE-Build/3197//testReport/org.apache.hadoop.hbase.regionserver.wal/TestHLogSplit/testLogCannotBeWrittenOnceParsed/
:
{code}
Error Message
The log file could have at most 1 extra log entry, but can't have less. Zombie
could write 6559 and logfile had only 6520 in
logfile=hdfs://localhost:44865/hbase/t1/bbb/recovered.edits/0000000000000000001
Stacktrace
java.lang.AssertionError: The log file could have at most 1 extra log entry,
but can't have less. Zombie could write 6559 and logfile had only 6520 in
logfile=hdfs://localhost:44865/hbase/t1/bbb/recovered.edits/0000000000000000001
at org.junit.Assert.fail(Assert.java:93)
at org.junit.Assert.assertTrue(Assert.java:43)
at
org.apache.hadoop.hbase.regionserver.wal.TestHLogSplit.testLogCannotBeWrittenOnceParsed(TestHLogSplit.java:190)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
{code}
> HLog writer can do 1-2 sync operations after lease has been recovered for
> split process.
> ----------------------------------------------------------------------------------------
>
> Key: HBASE-2645
> URL: https://issues.apache.org/jira/browse/HBASE-2645
> Project: HBase
> Issue Type: Bug
> Components: Filters
> Affects Versions: 0.90.4
> Reporter: Cosmin Lehene
> Assignee: Todd Lipcon
> Priority: Blocker
> Fix For: 0.96.0
>
> Attachments: 2645.txt, 2645v2.txt, 2645v3.txt
>
>
> TestHLogSplit.testLogCannotBeWrittenOnceParsed is failing.
> This test starts a thread that writes one edit to the log, syncs and counts.
> During this, a HLog.splitLog operation is started. splitLog recovers the log
> lease before reading the log, so that the original regionserver could not
> wake up and write after the split process started.
> The test compares the number of edits reported by the split process and by
> the writer thread. Writer thread (called zombie in the test) should report <=
> than the splitLog (sync() might raise after the last edit gets written and
> the edit won't get counted by zombie thread). However it appears that the
> zombie counts 1-2 more edits. So it looks like it can sync without a lease.
> This might be a hdfs-0.20 related issue.
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