Kevin Odell created HBASE-6262:
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Summary: Row Count hangs due to printing raw without filtering for
control codes/non-displayable characters
Key: HBASE-6262
URL: https://issues.apache.org/jira/browse/HBASE-6262
Project: HBase
Issue Type: Bug
Components: shell
Reporter: Kevin Odell
Attachments: hbase-shell.log
The problem is the key is printed raw without filtering for control
codes/non-displayable characters. Consequently, row 264000's row key includes
the data <ESC>P (hex: 1B 50) which initiates a VT100/ANSI DCS sequence, which
normally must be terminated by a DCS string terminator code, <ESC>\ (hex: 1B
5C) (cf.
At row 264000, <ESC>P appears, but is not followed by the <ESC>\ termination
code -- so instead of data being output to the display, it is getting buffered
by the terminal to complete the DCS command. Result: the data is not displayed
(xterminal) or the terminal locks up (gnome-terminal).
Note that this is a potential for abusing this "feature" to hide/alter
information displayed on the screen, since an arbitrary terminal control codes
could potentially be constructed and injected into a rowkey.
If you open a VT100-emulating terminal window can cat the attached file, as-is,
it would hang after displaying the starting portion of the line for row 264000.
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