Hadoop HDFS
  1. Hadoop HDFS
  2. HDFS-1623 High Availability Framework for HDFS NN
  3. HDFS-2667

HA: Fix NN Active->Standby transition

        Details

        • Type: Sub-task Sub-task
        • Status: Resolved
        • Priority: Major Major
        • Resolution: Fixed
        • Affects Version/s: HA branch (HDFS-1623)
        • Fix Version/s: HA branch (HDFS-1623)
        • Component/s: ha, namenode
        • Labels:
          None

          Description

          Currently when the active transitions to standby (eg for a manual failover) the EditLogTailer starts tailing edits at the wrong transaction ID. This causes it to double-apply a bunch of edits, which causes various problems. We need to add a test which checks this state transition and fix any related bugs.

          1. Text File
            hdfs-2667.txt
            9 kB
            Todd Lipcon
          2. Text File
            hdfs-2667.txt
            8 kB
            Todd Lipcon
          3. Text File
            hdfs-2667.txt
            8 kB
            Todd Lipcon
          4. Text File
            hdfs-2667.txt
            11 kB
            Todd Lipcon

            Activity

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            Todd Lipcon added a comment -

            Attached patch fixes the issues and adds unit tests for repeated manual failover and fail-back between two NNs. Both new test cases failed without the bug fixes.

            This applies on top of HDFS-2602 and HDFS-1972 though I think only 2602 is necessary.

            Show
            Todd Lipcon added a comment - Attached patch fixes the issues and adds unit tests for repeated manual failover and fail-back between two NNs. Both new test cases failed without the bug fixes. This applies on top of HDFS-2602 and HDFS-1972 though I think only 2602 is necessary.
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            Aaron T. Myers added a comment -

            One tiny comment: in testTransitionActiveToStandby, you should use TEST_FILE_PATH instead of new Path(TEST_DIR, "foo").

            +1 once that's fixed.

            Show
            Aaron T. Myers added a comment - One tiny comment: in testTransitionActiveToStandby , you should use TEST_FILE_PATH instead of new Path(TEST_DIR, "foo") . +1 once that's fixed.
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            Todd Lipcon added a comment -

            attached patch with atm's suggested test fix. Waiting on HDFS-2602 to commit this since the test fails without it.

            Show
            Todd Lipcon added a comment - attached patch with atm's suggested test fix. Waiting on HDFS-2602 to commit this since the test fails without it.
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            Todd Lipcon added a comment -

            Oops, I had resolved a conflict wrong in previous upload.. this one fixes it, but still waiting on 2602 for test to pass.

            Show
            Todd Lipcon added a comment - Oops, I had resolved a conflict wrong in previous upload.. this one fixes it, but still waiting on 2602 for test to pass.
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            Todd Lipcon added a comment -

            one more rev here - previous iteration broke backup node and TestFileJournalManager.

            Show
            Todd Lipcon added a comment - one more rev here - previous iteration broke backup node and TestFileJournalManager.
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            Aaron T. Myers added a comment -

            +1, latest patch looks good to me.

            Show
            Aaron T. Myers added a comment - +1, latest patch looks good to me.
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            Todd Lipcon added a comment -

            Committed to the branch, thanks Aaron.

            Show
            Todd Lipcon added a comment - Committed to the branch, thanks Aaron.
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            Hudson added a comment -

            Integrated in Hadoop-Hdfs-HAbranch-build #18 (See https://builds.apache.org/job/Hadoop-Hdfs-HAbranch-build/18/)
            HDFS-2667. Fix transition from active to standby. Contributed by Todd Lipcon.

            todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1215037
            Files :

            • /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-1623.txt
            • /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java
            • /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
            • /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FileJournalManager.java
            • /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/MiniDFSCluster.java
            • /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileJournalManager.java
            • /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestHAStateTransitions.java
            Show
            Hudson added a comment - Integrated in Hadoop-Hdfs-HAbranch-build #18 (See https://builds.apache.org/job/Hadoop-Hdfs-HAbranch-build/18/ ) HDFS-2667 . Fix transition from active to standby. Contributed by Todd Lipcon. todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1215037 Files : /hadoop/common/branches/ HDFS-1623 /hadoop-hdfs-project/hadoop-hdfs/CHANGES. HDFS-1623 .txt /hadoop/common/branches/ HDFS-1623 /hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java /hadoop/common/branches/ HDFS-1623 /hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java /hadoop/common/branches/ HDFS-1623 /hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FileJournalManager.java /hadoop/common/branches/ HDFS-1623 /hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/MiniDFSCluster.java /hadoop/common/branches/ HDFS-1623 /hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileJournalManager.java /hadoop/common/branches/ HDFS-1623 /hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestHAStateTransitions.java

              People

              • Assignee:
                Todd Lipcon
                Reporter:
                Todd Lipcon
              • Votes:
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                Dates

                • Created:
                  Updated:
                  Resolved:

                  Development