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https://issues.apache.org/jira/browse/HDFS-3194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13286108#comment-13286108
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Eli Collins commented on HDFS-3194:
-----------------------------------
Here's the DN log from a recent trunk build with just one block, we start a new
period and re-scan the block every 5 seconds:
2012-05-30 14:53:46,380 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a new
period : work left in prev period : 0.00%
2012-05-30 14:53:46,380 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Verification
succeeded for BP-279320499-127.0.1.1-1338414133947:blk_6750362468537267405_1002
2012-05-30 14:53:*51*,381 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a new
period : work left in prev period : 0.00%
2012-05-30 14:53:56,383 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a new
period : work left in prev period : 0.00%
2012-05-30 14:53:56,385 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Verification
succeeded for BP-279320499-127.0.1.1-1338414133947:blk_6750362468537267405_1002
2012-05-30 14:54:01,386 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a new
period : work left in prev period : 0.00%
2012-05-30 14:54:06,388 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Starting a new
period : work left in prev period : 0.00%
2012-05-30 14:54:06,389 INFO
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Verification
succeeded for BP-279320499-127.0.1.1-1338414133947:blk_6750362468537267405_1002
> DataNode block scanner is running too frequently
> ------------------------------------------------
>
> Key: HDFS-3194
> URL: https://issues.apache.org/jira/browse/HDFS-3194
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 2.0.0-alpha
> Reporter: suja s
> Assignee: amith
> Attachments: HDFS-3194.patch, HDFS-3194_1.patch, HDFS-3194_2.patch,
> HDFS-3194_4.patch, HDFS-3194_6.patch
>
>
> Block scanning interval by default should be taken as 21 days(3 weeks) and
> each block scanning should happen once in 21 days.
> Here the block is being scanned continuosly.
> 2012-04-03 10:44:47,056 INFO
> org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Verification
> succeeded for
> BP-241703115-xx.xx.xx.55-1333086229434:blk_-2666054955039014473_1003
> 2012-04-03 10:45:02,064 INFO
> org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Verification
> succeeded for
> BP-241703115-xx.xx.xx.55-1333086229434:blk_-2666054955039014473_1003
> 2012-04-03 10:45:17,071 INFO
> org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Verification
> succeeded for
> BP-241703115-xx.xx.xx.55-1333086229434:blk_-2666054955039014473_1003
> 2012-04-03 10:45:32,079 INFO
> org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner: Verification
> succeeded for BP-241703115-xx.xx.xx.55-1333086229434:blk_-2666054955039014473
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