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Posted to hdfs-dev@hadoop.apache.org by "Yongjun Zhang (JIRA)" <ji...@apache.org> on 2016/09/22 06:44:20 UTC
[jira] [Created] (HDFS-10887) Provide admin/debug tool to dump
block map
Yongjun Zhang created HDFS-10887:
------------------------------------
Summary: Provide admin/debug tool to dump block map
Key: HDFS-10887
URL: https://issues.apache.org/jira/browse/HDFS-10887
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs, namenode
Reporter: Yongjun Zhang
Assignee: Yongjun Zhang
From time to time, when NN restarts, we see
{code}
"The reported blocks X needs additional Y blocks to reach the threshold 0.9990 of total blocks Z. Safe mode will be turned off automatically.
{code}
We'd wonder what these blocks that still need block reports are, and what DNs they could possibly be located, what happened to these DNs.
This jira to to propose a new admin or debug tool to dump the block map info with the blocks that have fewer than minRepl replicas.
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