Kihwal Lee created HDFS-6088:
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Summary: Add configurable maximum block count for datanode
Key: HDFS-6088
URL: https://issues.apache.org/jira/browse/HDFS-6088
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Currently datanode resources are protected by the free space check and the
balancer. But datanodes can run out of memory simply storing too many blocks.
If the sizes of blocks are small, datanodes will appear to have plenty of space
to put more blocks.
I propose adding a configurable max block count to datanode. Since datanodes
can have different heap configurations, it will make sense to make it
datanode-level, rather than something enforced by namenode.
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