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From "Rushabh S Shah (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8893) DNs with failed volumes stop serving during rolling upgrade
Date Thu, 13 Aug 2015 14:29:45 GMT
Rushabh S Shah created HDFS-8893:
------------------------------------

             Summary: DNs with failed volumes stop serving during rolling upgrade
                 Key: HDFS-8893
                 URL: https://issues.apache.org/jira/browse/HDFS-8893
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.6.0
            Reporter: Rushabh S Shah
            Priority: Critical


When a rolling upgrade starts, all DNs try to write a rolling_upgrade marker to each of their
volumes. If one of the volumes is bad, this will fail. When this failure happens, the DN does
not update the key it received from the NN.
Unfortunately we had one failed volume on all the 3 datanodes which were having replica.

Keys expire after 20 hours so at about 20 hours into the rolling upgrade, the DNs with failed
volumes will stop serving clients.

Here is the stack trace on the datanode size:
{noformat}
2015-08-11 07:32:28,827 [DataNode: heartbeating to <nn1>8020] WARN datanode.DataNode:
IOException in offerService
java.io.IOException: Read-only file system
        at java.io.UnixFileSystem.createFileExclusively(Native Method)
        at java.io.File.createNewFile(File.java:947)
        at org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceStorage.setRollingUpgradeMarkers(BlockPoolSliceStorage.java:721)
        at org.apache.hadoop.hdfs.server.datanode.DataStorage.setRollingUpgradeMarker(DataStorage.java:173)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.setRollingUpgradeMarker(FsDatasetImpl.java:2357)
        at org.apache.hadoop.hdfs.server.datanode.BPOfferService.signalRollingUpgrade(BPOfferService.java:480)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.handleRollingUpgradeStatus(BPServiceActor.java:626)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:677)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:833)
        at java.lang.Thread.run(Thread.java:722)

{noformat}




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