[
https://issues.apache.org/jira/browse/HDFS-2635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
[email protected] updated HDFS-2635:
----------------------------------
Target Version/s: 0.20.203.0
Status: Patch Available (was: Open)
--- NNBench.java 2011-12-06 12:03:49.000000000 -0800
+++ NNBench.new 2011-12-06 12:03:31.000000000 -0800
@@ -722,16 +722,16 @@
if (barrier()) {
if (op.equals(OP_CREATE_WRITE)) {
startTimeTPmS = System.currentTimeMillis();
- doCreateWriteOp("file_" + hostName + "_", reporter);
+ doCreateWriteOp("file_" + hostName + "_" + key, reporter);
} else if (op.equals(OP_OPEN_READ)) {
startTimeTPmS = System.currentTimeMillis();
- doOpenReadOp("file_" + hostName + "_", reporter);
+ doOpenReadOp("file_" + hostName + "_" + key, reporter);
} else if (op.equals(OP_RENAME)) {
startTimeTPmS = System.currentTimeMillis();
- doRenameOp("file_" + hostName + "_", reporter);
+ doRenameOp("file_" + hostName + "_" + key, reporter);
} else if (op.equals(OP_DELETE)) {
startTimeTPmS = System.currentTimeMillis();
- doDeleteOp("file_" + hostName + "_", reporter);
+ doDeleteOp("file_" + hostName + "_" + key, reporter);
}
endTimeTPms = System.currentTimeMillis();
> NNBench creates duplicate files if multiple maps are run from the same client
> -----------------------------------------------------------------------------
>
> Key: HDFS-2635
> URL: https://issues.apache.org/jira/browse/HDFS-2635
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 0.20.205.0, 0.20.204.0, 0.20.203.0
> Reporter: [email protected]
> Priority: Minor
>
> NNBench creates files in the format:
> file_<hostname>__<filenum>
> This works seamlessly as long as all of the Hadoop clients in the cluster are
> each running with a single map slot. If multiple map slots are available on a
> single client, each mapper tries to create the same set of files. This can
> result in lock contention on some non-Hadoop HDFS implementations thereby
> defeating the purpose of the NNBench test.
> Making the files unique per mapper, not per host, resolves this.
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