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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2738) FSEditLog.selectinputStreams is reading through in-progress streams even when non-in-progress are requested
Date Sat, 31 Dec 2011 00:55:30 GMT
FSEditLog.selectinputStreams is reading through in-progress streams even when non-in-progress
are requested
-----------------------------------------------------------------------------------------------------------

                 Key: HDFS-2738
                 URL: https://issues.apache.org/jira/browse/HDFS-2738
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha, name-node
    Affects Versions: HA branch (HDFS-1623)
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Critical


The new code in HDFS-1580 is causing an issue with selectInputStreams in the HA context. When
the active is writing to the shared edits, selectInputStreams is called on the standby. This
ends up calling {{journalSet.getInputStream}} but doesn't pass the {{inProgressOk=false}}
flag. So, {{getInputStream}} ends up reading and validating the in-progress stream unnecessarily.
Since the validation results are no longer properly cached, {{findMaxTransaction}} also re-validates
the in-progress stream, and then breaks the corruption check in this code. The end result
is a lot of errors like:

2011-12-30 16:45:02,521 ERROR namenode.FileJournalManager (FileJournalManager.java:getNumberOfTransactions(266))
- Gap in transactions, max txnid is 579, 0 txns from 578
2011-12-30 16:45:02,521 INFO  ha.EditLogTailer (EditLogTailer.java:run(163)) - Got error,
will try again.
java.io.IOException: No non-corrupt logs for txid 578
	at org.apache.hadoop.hdfs.server.namenode.JournalSet.getInputStream(JournalSet.java:229)
	at org.apache.hadoop.hdfs.server.namenode.FSEditLog.selectInputStreams(FSEditLog.java:1081)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer.doTailEdits(EditLogTailer.java:115)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer.access$0(EditLogTailer.java:100)
	at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.run(EditLogTailer.java:154)


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