fuse_dfs is unable to connect to the dfs after a copying a large number of
files into the dfs over fuse
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Key: HADOOP-4932
URL: https://issues.apache.org/jira/browse/HADOOP-4932
Project: Hadoop Core
Issue Type: Bug
Components: contrib/fuse-dfs
Affects Versions: 0.19.0
Environment: Fedora core 10, x86_64, 2.6.27.7-134.fc10.x86_64 #1 SMP
(AMD 64), gcc 4.3.2, java 1.6.0 (IcedTea6 1.4 (fedora-7.b12.fc10-x86_64)
Runtime Environment (build 1.6.0_0-b12) OpenJDK 64-Bit Server VM (build
10.0-b19, mixed mode)
Reporter: Dima Brodsky
I run the following test:
1. Run hadoop DFS in single node mode
2. start up fuse_dfs
3. copy my source tree, about 250 megs, into the DFS
cp -av * /mnt/hdfs/
in /var/log/messages I keep seeing:
Dec 22 09:02:08 bodum fuse_dfs: ERROR: hdfs trying to utime
/bar/backend-trunk2/src/machinery/hadoop/output/2008/11/19 to
1229385138/1229963739
and then eventually
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1333
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1333
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1333
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1333
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1209
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1209
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1333
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1209
Dec 22 09:03:49 bodum fuse_dfs: ERROR: could not connect to dfs fuse_dfs.c:1037
and the file system hangs. hadoop is still running and I don't see any errors
in it's logs. I have to unmount the dfs and restart fuse_dfs and then
everything is fine again. At some point I see the following messages in the
/var/log/messages:
ERROR: dfs problem - could not close file_handle(139677114350528) for
/bar/backend-trunk2/src/machinery/hadoop/input/2008/12/14/actionrecordlog-8339-93825052368848-1229278807.log
fuse_dfs.c:1464
Dec 22 09:04:49 bodum fuse_dfs: ERROR: dfs problem - could not close
file_handle(139676770220176) for
/bar/backend-trunk2/src/machinery/hadoop/input/2008/12/14/actionrecordlog-8140-93825025883216-1229278759.log
fuse_dfs.c:1464
Dec 22 09:05:13 bodum fuse_dfs: ERROR: dfs problem - could not close
file_handle(139677114812832) for
/bar/backend-trunk2/src/machinery/hadoop/input/2008/12/14/actionrecordlog-8138-93825070138960-1229251587.log
fuse_dfs.c:1464
Is this a known issue? Am I just flooding the system too much. All of this is
being performed on a single, dual core, machine.
Thanks!
ttyl
Dima
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