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https://issues.apache.org/jira/browse/HDFS-8893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608734#comment-16608734
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Rushabh S Shah commented on HDFS-8893:
--------------------------------------
Moved to 3.3.0
> 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
> Assignee: Daryn Sharp
> 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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