Wellington Chevreuil created HDFS-12182:
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Summary: BlockManager.metSave does not distinguish between "under
replicated" and "corrupt" blocks
Key: HDFS-12182
URL: https://issues.apache.org/jira/browse/HDFS-12182
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Reporter: Wellington Chevreuil
Priority: Trivial
Fix For: 3.0.0-alpha3
Currently, *BlockManager.metaSave* method (which is called by "-metasave" dfs
CLI command) reports both "under replicated" and "corrupt" blocks under same
metric *Metasave: Blocks waiting for reconstruction:* as shown on below code
snippet:
{noformat}
synchronized (neededReconstruction) {
out.println("Metasave: Blocks waiting for reconstruction: "
+ neededReconstruction.size());
for (Block block : neededReconstruction) {
dumpBlockMeta(block, out);
}
}
{noformat}
*neededReconstruction* is an instance of *LowRedundancyBlocks*, which actually
wraps 5 priority queues currently. 4 of these queues store different under
replicated scenarios, but the 5th one is dedicated for corrupt blocks.
Thus, metasave report may suggest some corrupt blocks are just under
replicated. This can be misleading for admins and operators trying to track
block corruption issues, and/or other issues related to *BlockManager* metrics.
I would like to propose a patch with trivial changes that would report corrupt
blocks separately.
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