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java.lang.Objectorg.apache.hadoop.hbase.regionserver.wal.HLogPrettyPrinter
public class HLogPrettyPrinter
HLogPrettyPrinter prints the contents of a given HLog with a variety of options affecting formatting and extent of content. It targets two usage cases: pretty printing for ease of debugging directly by humans, and JSON output for consumption by monitoring and/or maintenance scripts. It can filter by row, region, or sequence id. It can also toggle output of values.
Constructor Summary | |
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HLogPrettyPrinter()
Basic constructor that simply initializes values to reasonable defaults. |
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HLogPrettyPrinter(boolean outputValues,
boolean outputJSON,
long sequence,
String region,
String row,
boolean persistentOutput,
PrintStream out)
Fully specified constructor. |
Method Summary | |
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void |
beginPersistentOutput()
enables output as a single, persistent list. |
void |
disableJSON()
turns JSON output off, and turns on "pretty strings" for human consumption |
void |
disableValues()
turns value output off |
void |
enableJSON()
turns JSON output on |
void |
enableValues()
turns value output on |
void |
endPersistentOutput()
ends output of a single, persistent list. |
void |
processFile(org.apache.hadoop.conf.Configuration conf,
org.apache.hadoop.fs.Path p)
reads a log file and outputs its contents, one transaction at a time, as specified by the currently configured options |
static void |
run(String[] args)
Pass one or more log file names and formatting options and it will dump out a text version of the contents on stdout . |
void |
setRegionFilter(String region)
sets the region by which output will be filtered |
void |
setRowFilter(String row)
sets the region by which output will be filtered |
void |
setSequenceFilter(long sequence)
sets the region by which output will be filtered |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public HLogPrettyPrinter()
public HLogPrettyPrinter(boolean outputValues, boolean outputJSON, long sequence, String region, String row, boolean persistentOutput, PrintStream out)
outputValues
- when true, enables output of values along with other log
informationoutputJSON
- when true, enables output in JSON format rather than a
"pretty string"sequence
- when nonnegative, serves as a filter; only log entries with this
sequence id will be printedregion
- when not null, serves as a filter; only log entries from this
region will be printedrow
- when not null, serves as a filter; only log entries from this row
will be printedpersistentOutput
- keeps a single list running for multiple files. if enabled, the
endPersistentOutput() method must be used!out
- Specifies an alternative to stdout for the destination of this
PrettyPrinter's output.Method Detail |
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public void enableValues()
public void disableValues()
public void enableJSON()
public void disableJSON()
public void setSequenceFilter(long sequence)
sequence
- when nonnegative, serves as a filter; only log entries with this
sequence id will be printedpublic void setRegionFilter(String region)
region
- when not null, serves as a filter; only log entries from this
region will be printedpublic void setRowFilter(String row)
row
- when not null, serves as a filter; only log entries from this row
will be printedpublic void beginPersistentOutput()
public void endPersistentOutput()
public void processFile(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.fs.Path p) throws IOException
conf
- the HBase configuration relevant to this log filep
- the path of the log file to be read
IOException
- may be unable to access the configured filesystem or requested
file.public static void run(String[] args) throws IOException
stdout
.
args
- Command line arguments
IOException
- Thrown upon file system errors etc.
org.apache.commons.cli.ParseException
- Thrown if command-line parsing fails.
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