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https://issues.apache.org/jira/browse/HDFS-10815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15591320#comment-15591320
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SammiChen commented on HDFS-10815:
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Hi Eisuke Umeda, thanks for provide more information! Have you ever tried if
only one namenode is involved, will this issue still be reproduceable? Is the
second namenode involvement a must have condition to reproduce the issue?
> The state of the EC file is erroneously recognized when you restart the
> NameNode.
> ---------------------------------------------------------------------------------
>
> Key: HDFS-10815
> URL: https://issues.apache.org/jira/browse/HDFS-10815
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: erasure-coding
> Affects Versions: 3.0.0-alpha1
> Environment: 2 NameNodes, 5 DataNodes, Erasured code policy is set as
> "RS-DEFAULT-3-2-64k"
> Reporter: Eisuke Umeda
>
> After carrying out an examination in the following procedures, an EC files
> came to be recognized as corrupt files.
> These files were able to get in "hdfs dfs -get".
> NameNode might be causing the false recognition.
> DataNodes: datanode[1-5]
> Rack awareness: not set
> Copy target files: /tmp/tpcds-generate/25/store_sales/*
> {code}
> $ hdfs dfs -ls /tmp/tpcds-generate/25/store_sales
> Found 25 items
> -rw-r--r-- 0 root supergroup 399430918 2016-08-16 15:11
> /tmp/tpcds-generate/25/store_sales/data-m-00000
> -rw-r--r-- 0 root supergroup 399054598 2016-08-16 15:11
> /tmp/tpcds-generate/25/store_sales/data-m-00001
> -rw-r--r-- 0 root supergroup 399329373 2016-08-16 15:11
> /tmp/tpcds-generate/25/store_sales/data-m-00002
> -rw-r--r-- 0 root supergroup 399528459 2016-08-16 15:11
> /tmp/tpcds-generate/25/store_sales/data-m-00003
> -rw-r--r-- 0 root supergroup 399329624 2016-08-16 15:11
> /tmp/tpcds-generate/25/store_sales/data-m-00004
> -rw-r--r-- 0 root supergroup 399085924 2016-08-16 15:11
> /tmp/tpcds-generate/25/store_sales/data-m-00005
> -rw-r--r-- 0 root supergroup 399337384 2016-08-16 15:12
> /tmp/tpcds-generate/25/store_sales/data-m-00006
> -rw-r--r-- 0 root supergroup 399199458 2016-08-16 15:12
> /tmp/tpcds-generate/25/store_sales/data-m-00007
> -rw-r--r-- 0 root supergroup 399679096 2016-08-16 15:12
> /tmp/tpcds-generate/25/store_sales/data-m-00008
> -rw-r--r-- 0 root supergroup 399440431 2016-08-16 15:12
> /tmp/tpcds-generate/25/store_sales/data-m-00009
> -rw-r--r-- 0 root supergroup 399403931 2016-08-16 15:12
> /tmp/tpcds-generate/25/store_sales/data-m-00010
> -rw-r--r-- 0 root supergroup 399472465 2016-08-16 15:12
> /tmp/tpcds-generate/25/store_sales/data-m-00011
> -rw-r--r-- 0 root supergroup 399451784 2016-08-16 15:12
> /tmp/tpcds-generate/25/store_sales/data-m-00012
> -rw-r--r-- 0 root supergroup 399240168 2016-08-16 15:12
> /tmp/tpcds-generate/25/store_sales/data-m-00013
> -rw-r--r-- 0 root supergroup 399370507 2016-08-16 15:12
> /tmp/tpcds-generate/25/store_sales/data-m-00014
> -rw-r--r-- 0 root supergroup 399633351 2016-08-16 15:12
> /tmp/tpcds-generate/25/store_sales/data-m-00015
> -rw-r--r-- 0 root supergroup 396532952 2016-08-16 15:13
> /tmp/tpcds-generate/25/store_sales/data-m-00016
> -rw-r--r-- 0 root supergroup 396258715 2016-08-16 15:13
> /tmp/tpcds-generate/25/store_sales/data-m-00017
> -rw-r--r-- 0 root supergroup 396382486 2016-08-16 15:13
> /tmp/tpcds-generate/25/store_sales/data-m-00018
> -rw-r--r-- 0 root supergroup 399016456 2016-08-16 15:13
> /tmp/tpcds-generate/25/store_sales/data-m-00019
> -rw-r--r-- 0 root supergroup 399465745 2016-08-16 15:13
> /tmp/tpcds-generate/25/store_sales/data-m-00020
> -rw-r--r-- 0 root supergroup 399208235 2016-08-16 15:13
> /tmp/tpcds-generate/25/store_sales/data-m-00021
> -rw-r--r-- 0 root supergroup 399198296 2016-08-16 15:13
> /tmp/tpcds-generate/25/store_sales/data-m-00022
> -rw-r--r-- 0 root supergroup 399599711 2016-08-16 15:13
> /tmp/tpcds-generate/25/store_sales/data-m-00023
> -rw-r--r-- 0 root supergroup 395150855 2016-08-16 15:13
> /tmp/tpcds-generate/25/store_sales/data-m-00024
> {code}
> NameNodes:
> namenode1(active)
> namenode2(standby)
> The directory which there is "Under-erasure-coded block groups":
> /tmp/tpcds-generate/test
> {code}
> $ sudo -u hdfs hdfs erasurecode -getPolicy /tmp/tpcds-generate/test
> ErasureCodingPolicy=[Name=RS-DEFAULT-3-2-64k,
> Schema=[ECSchema=[Codec=rs-default, numDataUnits=3, numParityUnits=2]],
> CellSize=65536 ]
> {code}
> The following is the steps to reproduce:
> 1) hdfs dfs -cp /tmp/tpcds-generate/25/store_sales/* /tmp/tpcds-generate/test
> 2) datanode1: (in the middle of the copy) sudo pkill -9 -f datanode
> 3) start a process of datanode1 two minutes later
> 4) carry out hdfs fsck and confirm that Under-Replicated Blocks occurred
> 5) wait until Under-Replicated Blocks becomes 0
> 6) (namenode1) /etc/init.d/hadoop-hdfs-namenode restart
> 7) (namenode2) /etc/init.d/hadoop-hdfs-namenode restart
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