Keith Turner created ACCUMULO-735:
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Summary: Add hooks to shell for transforming scan range
Key: ACCUMULO-735
URL: https://issues.apache.org/jira/browse/ACCUMULO-735
Project: Accumulo
Issue Type: New Feature
Reporter: Keith Turner
Assignee: Keith Turner
Fix For: 1.5.0
Hooks in the shell that can manipulate the range and columns passed to a scan
range would be nice.
My use case for this wanting to undo what a formatter did. For example,
suppose I use the new HexFormatter to view a table that has binary data like
the following.
Below, I scan my table w/o the hex formatter. And its hard to read.
{noformat}
root@test15 graph> scan
\x06\x07)d\x7F\x08\xA1\x00\x08\x01\x02\xEFd@\xC3\xD2S\xC8 edge:count [] 1
\x06\x07)d\x7F\x08\xA1\x00\x08\x08\x1C\xCE>\x8Ed\xE7\xDA edge:count [] 1
\x06\x07)d\x7F\x08\xA1\x00\x08\x0A\xC7\xCED\xA54\xC0, edge:count [] 1
\x06\x07)d\x7F\x08\xA1\x00\x08\x0C\x04\\Nz\x12}\x92 edge:count [] 1
\x06\x07)d\x7F\x08\xA1\x00\x08\x0E\x95\x80\x1A\xA6\xEE\xEF, edge:count [] 1
\x06\x07)d\x7F\x08\xA1\x00\x08\x0E\xCDBHYeP\xE0 edge:count [] 1
{noformat}
So I add the HexFormatter and scan again, now its easier to read.
{noformat}
root@test15 graph> formatter -t graph -f
org.apache.accumulo.core.util.format.HexFormatter
root@test15 graph> scan
0607-2964-7f08-a100-0801-02ef-6440-c3d2-53c8 6564-6765 636f-756e-74 [] 31
0607-2964-7f08-a100-0808-1cce-3e8e-64e7-da 6564-6765 636f-756e-74 [] 31
0607-2964-7f08-a100-080a-c7ce-44a5-34c0-2c 6564-6765 636f-756e-74 [] 31
0607-2964-7f08-a100-080c-045c-4e7a-127d-92 6564-6765 636f-756e-74 [] 31
0607-2964-7f08-a100-080e-9580-1aa6-eeef-2c 6564-6765 636f-756e-74 [] 31
0607-2964-7f08-a100-080e-cd42-4859-6550-e0 6564-6765 636f-756e-74 [] 31
0607-2964-7f08-a100-0816-ccf8-3526-daf4-27 6564-6765 636f-756e-74 [] 31
0607-2964-7f08-a100-0817-b645-dcf2-b73b-65 6564-6765 636f-756e-74 [] 31
{noformat}
However, if I want to scan a range of the table I have to use the \xXX
convention which is cumbersome. I would like to do the following :
{noformat}
scan -b 0607-2964-7f08-a100 -e 0607-2964-7f08-a101
{noformat}
To do this I propose adding the following hook to the shell. A user could
configure a scan interpreter on the shell like they configure a formatter.
The scan interpreter would take the command line arguments and translate or
interpret them. For example, a HexScanInterpeter could take in
0607-2964-7f08-a100 and output the binary representation for that hex string.
{code:java}
public interface ScanInterpreter {
public Text interpretRow(Text row);
public Text interpretBeginRow(Text row);
public Text interpretEndRow(Text row);
public Text interpretColumnFamily(Text cf);
public Text interpretColumnQualifier(Text cq);
}
{code}
Originally I was thinking of adding the methods above to the Formatter
interface. However Christopher Tubbs convinced me to create a separate
interface. His argument was that you may want to use something like the
HexScanInterpreter with different Formatters. Inorder to make configuration
easier we discussed adding a '-i' option to the shell formatter command. This
option would configure a Formatter that also implements the ScanInterpreter
interface, saving the user from entering two commands.
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