[
https://issues.apache.org/jira/browse/HBASE-7765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
stack resolved HBASE-7765.
--------------------------
Resolution: Won't Fix
Closing lads because WALPlayer has a main already... Its a Tool. Has some nice
args:
{code}
45 private void usage(final String errorMsg) {
44 if (errorMsg != null && errorMsg.length() > 0) {
43 System.err.println("ERROR: " + errorMsg);
42 }
41 System.err.println("Usage: " + NAME + " [options] <wal inputdir>
<tables> [<tableMappings>]");
40 System.err.println("Read all WAL entries for <tables>.");
39 System.err.println("If no tables (\"\") are specific, all tables are
imported.");
38 System.err.println("(Careful, even -ROOT- and .META. entries will be
imported in that case.)");
37 System.err.println("Otherwise <tables> is a comma separated list of
tables.\n");
36 System.err.println("The WAL entries can be mapped to new set of tables
via <tableMapping>.");
35 System.err.println("<tableMapping> is a command separated list of
targettables.");
34 System.err.println("If specified, each table in <tables> must have a
mapping.\n");
33 System.err.println("By default " + NAME + " will load data directly
into HBase.");
32 System.err.println("To generate HFiles for a bulk data load instead,
pass the option:");
31 System.err.println(" -D" + BULK_OUTPUT_CONF_KEY + "=/path/for/output");
30 System.err.println(" (Only one table can be specified, and no mapping
is allowed!)");
29 System.err.println("Other options: (specify time range to WAL edit to
consider)");
28 System.err.println(" -D" + HLogInputFormat.START_TIME_KEY +
"=[date|ms]");
27 System.err.println(" -D" + HLogInputFormat.END_TIME_KEY +
"=[date|ms]");
26 System.err.println("For performance also consider the following
options:\n"
25 + " -Dmapred.map.tasks.speculative.execution=false\n"
24 + " -Dmapred.reduce.tasks.speculative.execution=false");
23 }
{code}
It even has a bit of doc going on: http://hbase.apache.org/book.html#walplayer
> A tool to replay HLog entries in case a log file is missed while log splitting
> ------------------------------------------------------------------------------
>
> Key: HBASE-7765
> URL: https://issues.apache.org/jira/browse/HBASE-7765
> Project: HBase
> Issue Type: New Feature
> Components: wal
> Affects Versions: 0.94.4
> Reporter: Himanshu Vashishtha
> Assignee: Himanshu Vashishtha
>
> There may be a case where a HLog can escape the Log splitting.
> It will be good to have a standalone tool that reads entries from a HLog, and
> replays it back to HBase.
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