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From "Artem Ervits" <are9...@nyp.org>
Subject RE: Hadoop recovery test
Date Tue, 18 Sep 2012 13:57:11 GMT
No it only sees itself. It doesn't see the rest of the nodes.

-----Original Message-----
From: James Brown [mailto:jb.01@syndicate.net] 
Sent: Monday, September 17, 2012 5:49 PM
To: user@hadoop.apache.org
Subject: Re: Hadoop recovery test

Does the new NameNode server see all of the DataNodes?

On 9/17/2012 2:38 PM, Artem Ervits wrote:
> 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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