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From "Artem Ervits" <are9...@nyp.org>
Subject Hadoop recovery test
Date Mon, 17 Sep 2012 21:38:28 GMT
Hello all,

I am testing the Hadoop recovery as per http://wiki.apache.org/hadoop/NameNode document. But
instead of using an NFS share, I am copying to another directory. Then when I shut down the
cluster, I scp that directory to another server and start Hadoop cluster using that machine
as the namenode. I see in the log that some blocks are corrupt and/or missing. Do I have to
wait for replication to recover all blocks or am I doing something else altogether? I am using
Hadoop 1.0.3. Can someone point me to a more detailed document than the wiki in case I'm doing
something wrong.

p.s. if I restart the cluster using the original namenode, filesystem reports as healthy.

Thank you.

.
/hdfs/hadoop/tmp/mapred/system/jobtracker.info: CORRUPT block blk_9043419219670949307

/hdfs/hadoop/tmp/mapred/system/jobtracker.info: MISSING 1 blocks of total size 4 B...
/user/hduser/teragen/_logs/history/job_201209120941_0002_1347458152167_hduser_TeraGen:  Under
replicated blk_-976282286234272458_1079. Target Replicas is 3 but found 1 replica(s).
.
/user/hduser/teragen/_logs/history/job_201209120941_0002_conf.xml:  Under replicated blk_137658109390447967_1075.
Target Replicas is 3 but found 1 replica(s).
.
/user/hduser/teragen/_partition.lst:  Under replicated blk_-3005280481530403302_1080. Target
Replicas is 3 but found 1 replica(s).
.
/user/hduser/teragen/part-00000:  Under replicated blk_-7008813028808832816_1077. Target Replicas
is 3 but found 1 replica(s).
.
/user/hduser/teragen/part-00001:  Under replicated blk_-5256967771026054061_1078. Target Replicas
is 3 but found 1 replica(s).
..
/user/hduser/teragen-out/_logs/history/job_201209120941_0003_1347458249920_hduser_TeraSort:
 Under replicated blk_1137779303840586677_1089. Target Replicas is 3 but found 1 replica(s).
.
/user/hduser/teragen-out/_logs/history/job_201209120941_0003_conf.xml:  Under replicated blk_7701720691642589882_1086.
Target Replicas is 3 but found 1 replica(s).
.
/user/hduser/teragen-out/part-00000: CORRUPT block blk_8059469267617478950

/user/hduser/teragen-out/part-00000: MISSING 1 blocks of total size 1000000 B...
/user/hduser/teragen-validate/_logs/history/job_201209120941_0004_1347458495941_hduser_TeraValidate:
 Under replicated blk_5680565744062298575_1098. Target Replicas is 3 but found 1 replica(s).
.
/user/hduser/teragen-validate/_logs/history/job_201209120941_0004_conf.xml:  Under replicated
blk_1566253937037013126_1095. Target Replicas is 3 but found 1 replica(s).
.Status: CORRUPT
Total size:    1050720258 B
Total dirs:    39
Total files:   32
Total blocks (validated):      42 (avg. block size 25017149 B)
  ********************************
  CORRUPT FILES:        2
  MISSING BLOCKS:       2
  MISSING SIZE:         1000004 B
  CORRUPT BLOCKS:       2
  ********************************
Minimally replicated blocks:   40 (95.2381 %)
Over-replicated blocks:        0 (0.0 %)
Under-replicated blocks:       40 (95.2381 %)
Mis-replicated blocks:         0 (0.0 %)
Default replication factor:    3
Average block replication:     0.95238096
Corrupt blocks:                2
Missing replicas:              80 (200.0 %)
Number of data-nodes:          1
Number of racks:               1
FSCK ended at Mon Sep 17 17:29:08 EDT 2012 in 21 milliseconds


The filesystem under path '/' is CORRUPT


Artem Ervits
Data Analyst
New York Presbyterian Hospital


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