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https://issues.apache.org/jira/browse/HDFS-5346?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee updated HDFS-5346:
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Description:
When initial block reports are being processed, checkMode() is called from
incrementSafeBlockCount(). This causes the replication queues to be initialized
in the middle of processing a block report in the IBR processing mode. If there
are many block reports waiting to be processed, SafeModeMonitor won't be able
to make name node leave the safe mode soon. It appears that the block report
processing speed degrades considerably during this time.
Update: The main issue can be resolved by config. The other issue of calling
was:When initial block reports are being processed, checkMode() is called
from incrementSafeBlockCount(). This causes the replication queues to be
initialized in the middle of processing a block report in the IBR processing
mode. If there are many block reports waiting to be processed, SafeModeMonitor
won't be able to make name node leave the safe mode soon. It appears that the
block report processing speed degrades considerably during this time.
> Avoid unnecessary call to getNumLiveDataNodes() for each block during IBR
> processing
> ------------------------------------------------------------------------------------
>
> Key: HDFS-5346
> URL: https://issues.apache.org/jira/browse/HDFS-5346
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode, performance
> Affects Versions: 0.23.9, 2.3.0
> Reporter: Kihwal Lee
> Assignee: Ravi Prakash
> Fix For: 2.3.0, 0.23.10
>
> Attachments: HDFS-5346.branch-23.patch, HDFS-5346.branch-23.patch,
> HDFS-5346.patch, HDFS-5346.patch, HDFS-5346.patch
>
>
> When initial block reports are being processed, checkMode() is called from
> incrementSafeBlockCount(). This causes the replication queues to be
> initialized in the middle of processing a block report in the IBR processing
> mode. If there are many block reports waiting to be processed,
> SafeModeMonitor won't be able to make name node leave the safe mode soon. It
> appears that the block report processing speed degrades considerably during
> this time.
> Update: The main issue can be resolved by config. The other issue of calling
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