[HDFS-12204] Dfsclient Do not close file descriptor when using shortcircuit

• Type: Bug
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.7.3, 3.1.4
• Component/s: hdfs-client

Environment

HDFS 2.7.3, HBASE 1.2.6, centOS 6.8

• Assignee: HanRyong,Jung
• Reporter: HanRyong,Jung
• Created: 27/Jul/17 07:13
• Updated: 13/Oct/21 05:03

Description

I am a user using HDFS 2.7.3, HBASE 1.2.6, centOS 6.8.
The regionserver uses 11 hard disks(jbod) and uses the hbase short circuit.
At this time, when one disk fails in HDFS, I found a phenomenon that I did a hotswap but did not close file descriptor in hbase.
And the fd path on the umount disk is changed to an incorrect path.
If I check /proc/regionserver_pid/fd, if I used /data1/volumn and umounted data1, the path changed to /volumn.
And many file descriptors used in shortcircuit are in the delete state.

example )
ls -al /proc/regionserver_pid/fd

lr-x------ 1 dragonboy dragonboy 64 2017-07-26 20:54 946 -> /data8/volumn/hdfs/datanode/current/BP-199986352-10.114.243.73-1490077615453/current/finalized/subdir111/subdir21/blk_1215239490 (deleted)
lr-x------ 1 dragonboy dragonboy 64 2017-07-26 20:54 947 -> /data8/volumn/hdfs/datanode/current/BP-199986352-10.114.243.73-1490077615453/current/finalized/subdir111/subdir21/blk_1215239490_141511919.meta (deleted)
lr-x------ 1 dragonboy dragonboy 64 2017-07-26 20:54 948 -> /data7/volumn/hdfs/datanode/current/BP-199986352-10.114.243.73-1490077615453/current/finalized/subdir111/subdir27/blk_1215241080 (deleted)
lr-x------ 1 dragonboy dragonboy 64 2017-07-26 20:54 949 -> /data7/volumn/hdfs/datanode/current/BP-199986352-10.114.243.73-1490077615453/current/finalized/subdir111/subdir27/blk_1215241080_141513509.meta (deleted)
lr-x------ 1 dragonboy dragonboy 64 2017-07-26 20:54 192 -> /volumn/hdfs/datanode/current/BP-199986352-10.114.243.73-1490077615453/current/finalized/subdir244/subdir160/blk_1257545757 (deleted)
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when data4 fails, execute fuser)
/sbin/fuser -cu /data4

Cannot stat file /proc/regionserver_pid/fd/192: input/output error
Cannot stat file /proc/regionserver_pid/fd/1282: input/output error
Cannot stat file /proc/regionserver_pid/fd/1283: input/output error
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Issue Links

• is related to: HBASE-18454 RegionServer Do not close file descriptor when using shortcircuit