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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7928) Scanning blocks from disk during rolling upgrade startup takes a lot of time if disks are busy
Date Sat, 21 Mar 2015 00:15:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14372359#comment-14372359
] 

Hadoop QA commented on HDFS-7928:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12706033/HDFS-7928-v2.patch
  against trunk revision d81109e.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 6 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.tracing.TestTracing

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/10007//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/10007//console

This message is automatically generated.

> 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
>         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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