yuanboliu opened a new pull request, #4558:
URL: https://github.com/apache/hadoop/pull/4558
The key code is:
// code placeholder
try {
File blockFile = new File(info.getBlockURI());
if (blockFile != null && blockFile.getParentFile() == null) {
errors.add("Failed to delete replica " + invalidBlks[i]
+ ". Parent not found for block file: " + blockFile);
continue;
}
} catch(IllegalArgumentException e) {
LOG.warn("Parent directory check failed; replica " + info
+ " is not backed by a local file");
}
DN is trying to locate parent path of block file, thus there is a disk I/O
in pool-level lock. When the disk becomes very busy with high io wait, All the
pending threads will be blocked by the pool-level lock, and the time of
heartbeat is high. We proposal to change the pool-level lock to volume-level
lock for block invalidation
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