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HBASE-29947 Improve CopyTable usage instructions for copying between secure and non-secure clusters #7829

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Merged
NihalJain merged 3 commits into from
Mar 26, 2026
Merged

HBASE-29947 Improve CopyTable usage instructions for copying between secure and non-secure clusters #7829

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7a88780
HBASE-29947 Improve CopyTable command usage to execute in secure clus…
srinireddy2020 Mar 1, 2026
3475011
HBASE-29947 Improve CopyTable command usage to execute in secure clus…
srinireddy2020 Mar 23, 2026
2313b0a
HBASE-29947 Improve CopyTable command usage to execute in secure clus…
srinireddy2020 Mar 25, 2026
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32 changes: 32 additions & 0 deletions hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/CopyTable.java
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Original file line number Diff line number Diff line change
Expand Up @@ -251,6 +251,38 @@ private static void printUsage(final String errorMsg) {
System.err.println(" To copy data from 'sourceTableSnapshot' and bulk load to 'destTable': ");
System.err.println(" $ hbase org.apache.hadoop.hbase.mapreduce.CopyTable "
+ "--new.name=destTable --snapshot --bulkload sourceTableSnapshot");
System.err.println();
System.err.println(
" To copy the data of 'TestTable' from the secured local cluster to a non-secured peer"
+ " cluster (cluster-b)");
System.err.println(" $ hbase org.apache.hadoop.hbase.mapreduce.CopyTable "
+ "-Dhbase.mapred.output.hbase.security.authentication=simple "
+ "--peer.adr=cluster-b-1.example.com,cluster-b-2.example.com,cluster-b-3.example.com:"
+ "2181:/cluster-b" + " TestTable");
System.err.println();
System.err.println(
" To copy the data of 'TestTable' from the local secured cluster to a peer secured cluster "
+ "in a different Kerberos realm.");
System.err.println(" Assume cluster-b uses a different Kerberos principal "
+ "(cluster-b/_HOST@EXAMPLE.COM) for its master and regionserver.");
System.err.println(" $ hbase org.apache.hadoop.hbase.mapreduce.CopyTable "
+ "-Dhbase.mapred.output.hbase.regionserver.kerberos.principal="
+ "cluster-b/_HOST@EXAMPLE.COM "
+ "-Dhbase.mapred.output.hbase.master.kerberos.principal=cluster-b/_HOST@EXAMPLE.COM "
+ "--peer.adr=cluster-b-1.example.com,cluster-b-2.example.com,cluster-b-3.example.com:"
+ "2181:/cluster-b" + " TestTable");
System.err.println();
System.err.println(
" To copy the data of 'TestTable' from a non-secured local cluster to a secured peer cluster"
+ " (cluster-b)");
System.err.println(" $ hbase org.apache.hadoop.hbase.mapreduce.CopyTable "
+ "-Dhbase.mapred.output.hbase.security.authentication=kerberos "
+ "-Dhbase.mapred.output.hbase.regionserver.kerberos.principal="
+ "cluster-b/_HOST@EXAMPLE.COM "
+ "-Dhbase.mapred.output.hbase.master.kerberos.principal=cluster-b/_HOST@EXAMPLE.COM "
+ "--peer.adr=cluster-b-1.example.com,cluster-b-2.example.com,cluster-b-3.example.com:"
+ "2181:/cluster-b" + " TestTable");
System.err.println();
System.err.println("For performance consider the following general option:\n"
+ " It is recommended that you set the following to >=100. A higher value uses more memory but\n"
+ " decreases the round trip time to the server and may increase performance.\n"
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