cndaimin opened a new pull request, #4178:
URL: https://github.com/apache/hadoop/pull/4178
`WARN datanode.DirectoryScanner (DirectoryScanner.java:<init>(300)) -
dfs.datanode.directoryscan.throttle.limit.ms.per.sec set to value above 1000
ms/sec. Assuming default value of -1`
A warning log like above will be printed when datanode is starting. The
reason of that is the default value of
`dfs.datanode.directoryscan.throttle.limit.ms.per.sec` is 1000 in
hdfs-site.xml, and is -1 in
`DFS_DATANODE_DIRECTORYSCAN_THROTTLE_LIMIT_MS_PER_SEC_DEFAULT`. We should try
to keep it consistent, and value -1 looks is better to 1000.
The code segment that print the warning log:
```
if (throttle >= TimeUnit.SECONDS.toMillis(1)) {
LOG.warn(
"{} set to value above 1000 ms/sec. Assuming default value of {}",
DFSConfigKeys.DFS_DATANODE_DIRECTORYSCAN_THROTTLE_LIMIT_MS_PER_SEC_KEY,
DFSConfigKeys.DFS_DATANODE_DIRECTORYSCAN_THROTTLE_LIMIT_MS_PER_SEC_DEFAULT);
throttle =
DFSConfigKeys.DFS_DATANODE_DIRECTORYSCAN_THROTTLE_LIMIT_MS_PER_SEC_DEFAULT;
}
```
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