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Date: Fri, 17 Nov 2017 20:27:00 +0000 (UTC)
From: "Chao Sun (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13119312.1510950392000.269861.1510950420055@Atlassian.JIRA>
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References: <JIRA.13119312.1510950392000@Atlassian.JIRA> <JIRA.13119312.1510950392432@jira-lw-us.apache.org>
Subject: [jira] [Created] (HDFS-12836) startTxId could be greater than
 endTxId when tailing in-progress edit log
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archived-at: Fri, 17 Nov 2017 20:27:06 -0000

Chao Sun created HDFS-12836:
-------------------------------

             Summary: startTxId could be greater than endTxId when tailing in-progress edit log
                 Key: HDFS-12836
                 URL: https://issues.apache.org/jira/browse/HDFS-12836
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs
            Reporter: Chao Sun
            Assignee: Chao Sun


When {{dfs.ha.tail-edits.in-progress}} is true, edit log tailer will also tail those in progress edit log segments. However, in the following code:

{code}
        if (onlyDurableTxns && inProgressOk) {
          endTxId = Math.min(endTxId, committedTxnId);
        }

        EditLogInputStream elis = EditLogFileInputStream.fromUrl(
            connectionFactory, url, remoteLog.getStartTxId(),
            endTxId, remoteLog.isInProgress());
{code}

it is possible that {{remoteLog.getStartTxId()}} could be greater than {{endTxId}}, and therefore will cause the following error:

{code}
2017-11-17 19:55:41,165 ERROR org.apache.hadoop.hdfs.server.namenode.FSImage: Error replaying edit log at offset 1048576.  Expected transaction ID was 87
Recent opcode offsets: 1048576
org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream$PrematureEOFException: got premature end-of-file at txid 86; expected file to go up to 85
        at org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream.nextOp(RedundantEditLogInputStream.java:197)
        at org.apache.hadoop.hdfs.server.namenode.EditLogInputStream.readOp(EditLogInputStream.java:85)
        at org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream.nextOp(RedundantEditLogInputStream.java:189)
        at org.apache.hadoop.hdfs.server.namenode.EditLogInputStream.readOp(EditLogInputStream.java:85)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:205)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:158)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:882)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:863)
        at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer.doTailEdits(EditLogTailer.java:293)
        at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.doWork(EditLogTailer.java:427)
        at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.access$400(EditLogTailer.java:380)
        at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread$1.run(EditLogTailer.java:397)
        at org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:481)
        at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.run(EditLogTailer.java:393)
2017-11-17 19:55:41,165 WARN org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer: Error while reading edits from disk. Will try again.
org.apache.hadoop.hdfs.server.namenode.EditLogInputException: Error replaying edit log at offset 1048576.  Expected transaction ID was 87
Recent opcode offsets: 1048576
        at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:218)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:158)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:882)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:863)
        at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer.doTailEdits(EditLogTailer.java:293)
        at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.doWork(EditLogTailer.java:427)
        at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.access$400(EditLogTailer.java:380)
        at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread$1.run(EditLogTailer.java:397)
        at org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:481)
        at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.run(EditLogTailer.java:393)
Caused by: org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream$PrematureEOFException: got premature end-of-file at txid 86; expected file to go up to 85
        at org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream.nextOp(RedundantEditLogInputStream.java:197)
        at org.apache.hadoop.hdfs.server.namenode.EditLogInputStream.readOp(EditLogInputStream.java:85)
        at org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream.nextOp(RedundantEditLogInputStream.java:189)
        at org.apache.hadoop.hdfs.server.namenode.EditLogInputStream.readOp(EditLogInputStream.java:85)
        at org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:205)
        ... 9 more
{code}


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