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https://issues.apache.org/jira/browse/HDFS-7928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14381874#comment-14381874
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Hudson commented on HDFS-7928:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk #2094 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2094/])
HDFS-7928. Scanning blocks from disk during rolling upgrade startup takes a lot
of time if disks are busy. Contributed by Rushabh Shah. (kihwal: rev
fc1031af749435dc95efea6745b1b2300ce29446)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/BlockListAsLongs.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/DataNodeTestUtils.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestWriteToReplica.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestPendingCorruptDnMessages.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeList.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/UpgradeUtilities.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestProcessCorruptBlocks.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestListCorruptFileBlocks.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
> Scanning blocks from disk during rolling upgrade startup takes a lot of time
> if disks are busy
> ----------------------------------------------------------------------------------------------
>
> Key: HDFS-7928
> URL: https://issues.apache.org/jira/browse/HDFS-7928
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.6.0
> Reporter: Rushabh S Shah
> Assignee: Rushabh S Shah
> Fix For: 2.8.0
>
> Attachments: HDFS-7928-v1.patch, HDFS-7928-v2.patch, HDFS-7928.patch
>
>
> We observed this issue in rolling upgrade to 2.6.x on one of our cluster.
> One of the disks was very busy and it took long time to scan that disk
> compared to other disks.
> Seeing the sar (System Activity Reporter) data we saw that the particular
> disk was very busy performing IO operations.
> Requesting for an improvement during datanode rolling upgrade.
> During shutdown, we can persist the whole volume map on the disk and let the
> datanode read that file and create the volume map during startup after
> rolling upgrade.
> This will not require the datanode process to scan all the disk and read the
> block.
> This will significantly improve the datanode startup time.
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