I am trying to run a hive query using gcloud compute ssh via scala
First, here is what i tried
scala> import sys.process._
scala> val results = Seq("hive", "-e", "show databases;").!!
asd
zxc
qwe
scala>
which is good. Now, i want to run the same hive command, but against a GCP cluster. I have gcloud setup on my VM and from the command line, i can easily do
$ gcloud compute ssh --zone myZone myNode --internal-ip -- 'hive -e "show databases;"'
Updating project ssh metadata...⠶Updated [https://www.googleapis.com/compute/v1/projects/myProject].
Updating project ssh metadata...done.
Waiting for SSH key to propagate.
Warning: Permanently added 'compute.2746937995265952194' (RSA) to the list of known hosts.
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 19 100 19 0 0 2982 0 --:--:-- --:--:-- --:--:-- 3166
Logging initialized using configuration in file:/etc/hive/conf.dist/hive-log4j2.properties Async: true
OK
asd
zxc
qwe
Now, I want to run the above using scala. Here is what i tried
scala> val results = Seq("gcloud", "compute", "ssh", "--zone", "myZone", "myNode", "--internal-ip", "--", "hive", "-e" ,"show databases").!!
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 19 100 19 0 0 3270 0 --:--:-- --:--:-- --:--:-- 3800
Pseudo-terminal will not be allocated because stdin is not a terminal.
Logging initialized using configuration in file:/etc/hive/conf.dist/hive-log4j2.properties Async: true
NoViableAltException(-1@[846:1: ddlStatement : ( createDatabaseStatement | switchDatabaseStatement | dropDatabaseStatement | createTableStatement | dropTableStatement | truncateTableStatement | alterStatement | descStatement | showStatement | metastoreCheck | createViewStatement | createMaterializedViewStatement | dropViewStatement | dropMaterializedViewStatement | createFunctionStatement | createMacroStatement | createIndexStatement | dropIndexStatement | dropFunctionStatement | reloadFunctionStatement | dropMacroStatement | analyzeStatement | lockStatement | unlockStatement | lockDatabase | unlockDatabase | createRoleStatement | dropRoleStatement | ( grantPrivileges )=> grantPrivileges | ( revokePrivileges )=> revokePrivileges | showGrants | showRoleGrants | showRolePrincipals | showRoles | grantRole | revokeRole | setRole | showCurrentRole | abortTransactionStatement );])
at org.antlr.runtime.DFA.noViableAlt(DFA.java:158)
at org.antlr.runtime.DFA.predict(DFA.java:144)
at org.apache.hadoop.hive.ql.parse.HiveParser.ddlStatement(HiveParser.java:3757)
at org.apache.hadoop.hive.ql.parse.HiveParser.execStatement(HiveParser.java:2382)
at org.apache.hadoop.hive.ql.parse.HiveParser.statement(HiveParser.java:1333)
at org.apache.hadoop.hive.ql.parse.ParseDriver.parse(ParseDriver.java:208)
at org.apache.hadoop.hive.ql.parse.ParseUtils.parse(ParseUtils.java:77)
at org.apache.hadoop.hive.ql.parse.ParseUtils.parse(ParseUtils.java:70)
at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:468)
at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1317)
at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1457)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1237)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1227)
at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:233)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:184)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:336)
at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:787)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:759)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:686)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.util.RunJar.run(RunJar.java:244)
at org.apache.hadoop.util.RunJar.main(RunJar.java:158)
FAILED: ParseException line 1:4 cannot recognize input near 'show' '<EOF>' '<EOF>' in ddl statement
java.lang.RuntimeException: Nonzero exit value: 64
at scala.sys.package$.error(package.scala:27)
at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.slurp(ProcessBuilderImpl.scala:132)
at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.$bang$bang(ProcessBuilderImpl.scala:102)
... 50 elided
scala>
why am i getting this error ? I also tried
scala> val results = Seq("gcloud", "compute", "ssh", "--zone", "myZone", "myNode", "--internal-ip", "--", "hive", "-e" ,"show databases;").!!
but got the same error. Then i tried
scala> val results = Seq("gcloud", "compute", "ssh", "--zone", "myZone", "myNode", "--internal-ip", "--", "'hive -e \"show databases;\"'").!!
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 19 100 19 0 0 3245 0 --:--:-- --:--:-- --:--:-- 3800
Pseudo-terminal will not be allocated because stdin is not a terminal.
bash: hive -e "show databases;": command not found
java.lang.RuntimeException: Nonzero exit value: 127
at scala.sys.package$.error(package.scala:27)
at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.slurp(ProcessBuilderImpl.scala:132)
at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.$bang$bang(ProcessBuilderImpl.scala:102)
... 50 elided
How can I run the gcloud comput ssh properly using scala ?
You don't need the single quotes in your last example. You're trying to pass the string:
hive -e "show databases;"
For fun, I would use triple quotes in Scala:
"""hive -e "show databases;""""
to avoid backslash. Single quotes in your good command line are processed by bash.
This is what worked in bash:
$ gcloud compute ssh --zone myZone myNode --internal-ip -- 'hive -e "show databases;"'
scala.sys.process got some basic parsing at some point. There is a space in this file name that must be quoted. Amazingly, it seems to do shell-style quotes:
$ scala
Welcome to Scala 2.13.0 (OpenJDK 64-Bit Server VM, Java 11.0.3).
Type in expressions for evaluation. Or try :help.
scala> import scala.sys.process._
import scala.sys.process._
scala> "ls -l /tmp/skypeforlinux Crashes".!!
ls: cannot access '/tmp/skypeforlinux': No such file or directory
ls: cannot access 'Crashes': No such file or directory
java.lang.RuntimeException: Nonzero exit value: 2
at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.slurp(ProcessBuilderImpl.scala:155)
at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.$bang$bang(ProcessBuilderImpl.scala:112)
... 28 elided
scala> """ls -l "/tmp/skypeforlinux Crashes"""".!!
res1: String =
"total 0
"
scala> """ls -l '/tmp/skypeforlinux Crashes'""".!!
res2: String =
"total 0
"
scala> """ls -l /tmp/skypeforlin'ux Cr'ashes""".!!
res3: String =
"total 0
"
scala> """echo 'hive -e "show databases;"'""".!!
res4: String =
"hive -e "show databases;"
"
The double quotes around "my house" are part of the file name:
scala> """ls '/tmp/"my house"'""".!!
res5: String =
"/tmp/"my house"
"
I guess that code is where I learned how shell-style quotes work, though I never have a chance to use that knowledge. Except for this answer, so thanks for the opportunity.