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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8276) Backport hbase-6738 to 0.94 "Too aggressive task resubmission from the distributed log manager"
Date Fri, 05 Apr 2013 00:34:24 GMT
Jeffrey Zhong created HBASE-8276:
------------------------------------

             Summary: Backport hbase-6738 to 0.94 "Too aggressive task resubmission from the
distributed log manager"
                 Key: HBASE-8276
                 URL: https://issues.apache.org/jira/browse/HBASE-8276
             Project: HBase
          Issue Type: Bug
            Reporter: Jeffrey Zhong
            Assignee: Jeffrey Zhong


In recent tests, we found situations that when some data nodes are down and file operations
are slow depending on underlying hdfs timeout(normally 30 secs and socket connection timeout
maybe around 1 min). While split log task heart beat time out is only 25 secs, a split log
task will be preempted by SplitLogManager and assign to someone else after the 25 secs. On
a small cluster, you'll see the same task is keeping bounced back & force for a while.
I pasted a snippet of related logs below. You can search "preempted from" to see a task is
preempted.

{code}
2013-04-01 21:22:08,599 INFO org.apache.hadoop.hbase.regionserver.wal.HLogSplitter: Splitting
hlog: hdfs://ip-10-137-16-140.ec2.internal:8020/apps/hbase/data/.logs/ip-10-137-20-188.ec2.internal,60020,1364849530779-splitting/ip-10-137-20-188.ec2.internal%2C60020%2C1364849530779.1364865506159,
length=127639653
2013-04-01 21:22:08,599 INFO org.apache.hadoop.hbase.util.FSHDFSUtils: Recovering file hdfs://ip-10-137-16-140.ec2.internal:8020/apps/hbase/data/.logs/ip-10-137-20-188.ec2.internal,60020,1364849530779-splitting/ip-10-137-20-188.ec2.internal%2C60020%2C1364849530779.1364865506159
2013-04-01 21:22:09,603 INFO org.apache.hadoop.hbase.util.FSHDFSUtils: Finished lease recover
attempt for hdfs://ip-10-137-16-140.ec2.internal:8020/apps/hbase/data/.logs/ip-10-137-20-188.ec2.internal,60020,1364849530779-splitting/ip-10-137-20-188.ec2.internal%2C60020%2C1364849530779.1364865506159
2013-04-01 21:22:09,629 WARN org.apache.hadoop.hbase.regionserver.wal.HLogSplitter: Found
existing old edits file. It could be the result of a previous failed split attempt. Deleting
hdfs://ip-10-137-16-140.ec2.internal:8020/apps/hbase/data/IntegrationTestLoadAndVerify/73387f8d327a45bacf069bd631d70b3b/recovered.edits/0000000000003703447.temp,
length=0
2013-04-01 21:22:09,629 WARN org.apache.hadoop.hbase.regionserver.wal.HLogSplitter: Found
existing old edits file. It could be the result of a previous failed split attempt. Deleting
hdfs://ip-10-137-16-140.ec2.internal:8020/apps/hbase/data/IntegrationTestLoadAndVerify/b749cbceaaf037c97f70cc2a6f48f2b8/recovered.edits/0000000000003703446.temp,
length=0
2013-04-01 21:22:09,630 WARN org.apache.hadoop.hbase.regionserver.wal.HLogSplitter: Found
existing old edits file. It could be the result of a previous failed split attempt. Deleting
hdfs://ip-10-137-16-140.ec2.internal:8020/apps/hbase/data/IntegrationTestLoadAndVerify/c26b9d4a042d42c1194a8c2f389d33c8/recovered.edits/0000000000003703448.temp,
length=0
2013-04-01 21:22:09,666 WARN org.apache.hadoop.hbase.regionserver.wal.HLogSplitter: Found
existing old edits file. It could be the result of a previous failed split attempt. Deleting
hdfs://ip-10-137-16-140.ec2.internal:8020/apps/hbase/data/IntegrationTestLoadAndVerify/adabdb40ccd52140f09f953ff41fd829/recovered.edits/0000000000003703451.temp,
length=0
2013-04-01 21:22:09,722 WARN org.apache.hadoop.hbase.regionserver.wal.HLogSplitter: Found
existing old edits file. It could be the result of a previous failed split attempt. Deleting
hdfs://ip-10-137-16-140.ec2.internal:8020/apps/hbase/data/IntegrationTestLoadAndVerify/19f463fe74f4365e7df3e5fdb13aecad/recovered.edits/0000000000003703468.temp,
length=0
2013-04-01 21:22:09,734 WARN org.apache.hadoop.hbase.regionserver.wal.HLogSplitter: Found
existing old edits file. It could be the result of a previous failed split attempt. Deleting
hdfs://ip-10-137-16-140.ec2.internal:8020/apps/hbase/data/IntegrationTestLoadAndVerify/b3e759a3fc9c4e83064961cc3cd4a911/recovered.edits/0000000000003703459.temp,
length=0
2013-04-01 21:22:09,770 WARN org.apache.hadoop.hbase.regionserver.wal.HLogSplitter: Found
existing old edits file. It could be the result of a previous failed split attempt. Deleting
hdfs://ip-10-137-16-140.ec2.internal:8020/apps/hbase/data/IntegrationTestLoadAndVerify/6f078553be50897a986734ae043a5889/recovered.edits/0000000000003703454.temp,
length=0
2013-04-01 21:22:34,985 INFO org.apache.hadoop.hbase.regionserver.SplitLogWorker: task /hbase/splitlog/hdfs%3A%2F%2Fip-10-137-16-140.ec2.internal%3A8020%2Fapps%2Fhbase%2Fdata%2F.logs%2Fip-10-137-20-188.ec2.internal%2C60020%2C1364849530779-splitting%2Fip-10-137-20-188.ec2.internal%252C60020%252C1364849530779.1364865506159
preempted from ip-10-151-29-196.ec2.internal,60020,1364849530671, current task state and owner=unassigned
ip-10-137-16-140.ec2.internal,60000,1364849528428
{code}

The exact same issue is fixed by hbase-6738 in trunk so here comes the backport. 

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