{"id":79675,"date":"2020-08-26T09:00:22","date_gmt":"2020-08-26T03:30:22","guid":{"rendered":"https:\/\/techvidvan.com\/tutorials\/?p=79675"},"modified":"2020-08-26T09:00:22","modified_gmt":"2020-08-26T03:30:22","slug":"apache-sqoop-troubleshooting","status":"publish","type":"post","link":"https:\/\/techvidvan.com\/tutorials\/apache-sqoop-troubleshooting\/","title":{"rendered":"Sqoop Troubleshooting &#8211; Issues while Using Apache sqoop"},"content":{"rendered":"<p>While working with Apache Sqoop, some failures may occur. For troubleshooting any failure that occurs while working on Apache Sqoop, we have to follow several steps.<\/p>\n<p>In this Sqoop Troubleshooting article, you will learn the \u201cSqoop Troubleshooting\u201d process and some known Apache Sqoop issues. You will also explore some known issues that generally occur in Sqoop.<\/p>\n<p><a href=\"https:\/\/techvidvan.com\/tutorials\/wp-content\/uploads\/sites\/2\/2020\/08\/Sqoop-troubleshooting-TV.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-79677\" src=\"https:\/\/techvidvan.com\/tutorials\/wp-content\/uploads\/sites\/2\/2020\/08\/Sqoop-troubleshooting-TV.jpg\" alt=\"Sqoop troubleshooting\" width=\"1200\" height=\"628\" \/><\/a><\/p>\n<h3>The General Troubleshooting Process<\/h3>\n<p>We have to follow the below mentioned steps to troubleshoot any failure that we encounter while running Apache Sqoop.<\/p>\n<ul>\n<li>At first, we have to turn on the verbose output by executing the same Sqoop command again with the &#8211;verbose option specified. This will produce more debug output on a console, which we can inspect easily to identify any obvious errors.<\/li>\n<li>Secondly, look at the task logs from the Hadoop in order to see that any specific failures recorded there. It may be possible that the failure which is encountered during task execution is not conveyed correctly to the console.<\/li>\n<li>We have to make sure that the required input files or the input or output tables were present and can be accessed by the user that Apache Sqoop is executing as. Sometimes it may be possible that the required files or tables are present but the user that Sqoop connects to doesn&#8217;t have the permissions required for accessing these files.<\/li>\n<li>If you are doing a compound action and faced some error then try to break the job into two separate actions in order to see from where the problem occurs. Suppose an import which creates and populates the Hive table fails, then in such a case we can break it in two steps, that is, doing the import alone, and secondly creating a Hive table by using create-hive-table tool. This helps to narrow down the problem.<\/li>\n<li>You can also search the JIRA and the mailing lists archives for keywords relating to your problem. It may be possible that you will find the solution of your problem discussed there which will help you in solving your problem.<\/li>\n<\/ul>\n<p>Now let\u2019s explore some specific Sqoop Troubleshooting Tips.<\/p>\n<h3>Specific Troubleshooting Tips<\/h3>\n<h4>1. Oracle: Connection Reset Errors<\/h4>\n<p><strong>Problem:<\/strong> It may happen that while using the default Sqoop connector for Oracle, then some data get transferred, but a lot of errors may occur during the map-reduce job.<\/p>\n<p><strong>Solution:<\/strong> The above problem generally occurs because of the shortage of the fast random number generation device on a host where the mappers execute.<br \/>\nOn the Linux systems we can address this issue by setting following property in a java.security file:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"null\">securerandom.source=file:\/dev\/..\/dev\/urandom\n<\/pre>\n<p>The file java.security is found under the $JAVA_HOME\/jre\/lib\/security directory.<br \/>\nAlternatively, we can also specify this property on the command line via:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"null\">-D mapred.child.java.opts=\"-Djava.security.egd=file:\/dev\/..\/dev\/urandom\u201d\n<\/pre>\n<h4>2. Oracle: Case-Sensitive Catalog Query Errors<\/h4>\n<p><strong>Problem:<\/strong> Sometimes, while working with Oracle, we may encounter the problems when ApacheSqoop can not figure out the column names.<\/p>\n<p>This usually happens due to the catalog queries that Apache Sqoop uses for Oracle to expect the correct case which is to be specified for the user name and the table name. For example, using the &#8211;hive-import and resulting in the NullPointerException.<\/p>\n<p><strong>Solution:<\/strong> The solution to this problem is:<\/p>\n<ol>\n<li>Specify user name, which Apache Sqoop is connecting as, in the upper case (unless the username was created with the mixed\/lower case within the quotes).<\/li>\n<li>Specify table name, you are working with, in the upper case (unless the table name was created with the mixed\/lower case within the quotes).<\/li>\n<\/ol>\n<h4>3. MySQL: Connection Failure<\/h4>\n<p><strong>Problem:<\/strong> It may be possible that while importing the MySQL table into the Sqoop, if we don\u2019t have the necessary permissions for accessing our MySQL database over the network, then we may get error stating connection failure.<\/p>\n<p><strong>Solution:<\/strong> To solve this error, firstly, we have to verify that we can connect to a database from the machine where we are running Sqoop:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"null\">$ mysql --host=&lt;IP Address&gt; --database=test --user=&lt;username&gt; --password=&lt;password&gt;\n<\/pre>\n<p>If the above command works, it rules out the problem either with the client network configuration or the security\/authentication configuration.<br \/>\nSo, add network port for the server to your my.cnf file \/etc\/my.cnf:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"null\">[mysqld]\nport = xxxx\n<\/pre>\n<p>Now, set a user account to connect through Sqoop and grant permissions to a user to access the database over the network. For doing this:<\/p>\n<ol>\n<li>Log into MySQL as root mysql -u root -p&lt;ThisIsMyPassword&gt;.<\/li>\n<li>Issue the following command:<\/li>\n<\/ol>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"null\">mysql&gt; grant all privileges on test.* to 'testuser'@'%' identified by 'testpassword'\n<\/pre>\n<p><strong>Note :<\/strong> This is not advisable for the production environment. For the production environment, consult your DBA to grant the required privileges based on setup topology.<\/p>\n<h4>4. Oracle: ORA-00933 error (SQL command not properly ended)<\/h4>\n<p><strong>Problem:<\/strong> Sometimes while working with the Oracle we may face problems when Sqoop command explicitly specifies the option &#8211;driver &lt;driver name&gt;.<\/p>\n<p>When the option driver is included in a Sqoop command, the built-in connection manager selection defaults to the generic connection manager, which causes issues with Oracle.<\/p>\n<p>If in case the driver option is not specified, then the built-in connection manager selection mechanism selects Oracle-specific connection manager which will generate a valid SQL for the Oracle and uses a driver &#8220;oracle.jdbc.OracleDriver&#8221;.<\/p>\n<p>The error occur will be:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"null\">ERROR manager.SqlManager: Error executing statement:\njava.sql.SQLSyntaxErrorException: ORA-00933: SQL command not properly ended\n<\/pre>\n<p><strong>Solution:<\/strong> The solution for the above problem is to omit the option &#8211;driver oracle.jdbc.driver.OracleDriver. After omitting it, just re-run the Sqoop command.<\/p>\n<h4>6. MySQL: Import of TINYINT(1) from MySQL behaves strangely<\/h4>\n<p><strong>Problem:<\/strong> It may happen that the Apache Sqoop is treating TINYINT(1) columns as the booleans types. This may cause issues with the HIVE import.<\/p>\n<p>This issue occurs because, by default, the MySQL JDBC connector maps TINYINT(1) to the java.sql.Types.BIT, which Apache Sqoop by default maps to Boolean.<\/p>\n<p><strong>Solution:<\/strong> A more clean solution to this problem is to force the MySQL JDBC Connector to stop converting the TINYINT(1) to the java.sql.Types.BIT by adding the property tinyInt1isBit=false into your JDBC path (creating something like jdbc:mysql:\/\/localhost\/test?tinyInt1isBit=false).<br \/>\nAlternatively, we can explicitly override the column mapping for the TINYINT(1) datatype column.<\/p>\n<p>For example, if a column name is foo, then you can pass the following option to Apache Sqoop during import:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"null\">--map-column-hive foo=tinyint\n<\/pre>\n<p>In a case of non-Hive imports to HDFS, use<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"null\">--map-column-java foo=integer<\/pre>\n<h3>Summary<\/h3>\n<p>In short, we can say that you have learned all the possible sqoop troubleshooting steps. This will help you to troubleshoot all the possible failures that may occur while using Sqoop.<\/p>\n<p>The article had enlisted the general Sqoop troubleshooting steps as well as some Apache sqoop known issues.<\/p>\n<p>If you want to ask any query, then feel free to share it through the comment section. We will get back to you soon.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>While working with Apache Sqoop, some failures may occur. For troubleshooting any failure that occurs while working on Apache Sqoop, we have to follow several steps. In this Sqoop Troubleshooting article, you will learn&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":79677,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3163],"tags":[3201],"class_list":["post-79675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sqoop","tag-sqoop-troubleshooting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sqoop Troubleshooting - Issues while Using Apache sqoop - TechVidvan<\/title>\n<meta name=\"description\" content=\"Learn Apache Sqoop troubleshooting Process - Learn the steps to be followed to troubleshoot any failure that you encounter while running Sqoop.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/techvidvan.com\/tutorials\/apache-sqoop-troubleshooting\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sqoop Troubleshooting - Issues while Using Apache sqoop - TechVidvan\" \/>\n<meta property=\"og:description\" content=\"Learn Apache Sqoop troubleshooting Process - Learn the steps to be followed to troubleshoot any failure that you encounter while running Sqoop.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/techvidvan.com\/tutorials\/apache-sqoop-troubleshooting\/\" \/>\n<meta property=\"og:site_name\" content=\"TechVidvan\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/TechVidvan\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-08-26T03:30:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/techvidvan.com\/tutorials\/wp-content\/uploads\/2020\/08\/Sqoop-troubleshooting-TV.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"628\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"TechVidvan Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@vidvantech\" \/>\n<meta name=\"twitter:site\" content=\"@vidvantech\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"TechVidvan Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Sqoop Troubleshooting - Issues while Using Apache sqoop - TechVidvan","description":"Learn Apache Sqoop troubleshooting Process - Learn the steps to be followed to troubleshoot any failure that you encounter while running Sqoop.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/techvidvan.com\/tutorials\/apache-sqoop-troubleshooting\/","og_locale":"en_US","og_type":"article","og_title":"Sqoop Troubleshooting - Issues while Using Apache sqoop - TechVidvan","og_description":"Learn Apache Sqoop troubleshooting Process - Learn the steps to be followed to troubleshoot any failure that you encounter while running Sqoop.","og_url":"https:\/\/techvidvan.com\/tutorials\/apache-sqoop-troubleshooting\/","og_site_name":"TechVidvan","article_publisher":"https:\/\/www.facebook.com\/TechVidvan\/","article_published_time":"2020-08-26T03:30:22+00:00","og_image":[{"width":1200,"height":628,"url":"https:\/\/techvidvan.com\/tutorials\/wp-content\/uploads\/2020\/08\/Sqoop-troubleshooting-TV.jpg","type":"image\/jpeg"}],"author":"TechVidvan Team","twitter_card":"summary_large_image","twitter_creator":"@vidvantech","twitter_site":"@vidvantech","twitter_misc":{"Written by":"TechVidvan Team","Est. reading time":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/techvidvan.com\/tutorials\/apache-sqoop-troubleshooting\/#article","isPartOf":{"@id":"https:\/\/techvidvan.com\/tutorials\/apache-sqoop-troubleshooting\/"},"author":{"name":"TechVidvan Team","@id":"https:\/\/techvidvan.com\/tutorials\/#\/schema\/person\/e9c26e74dd3d87421f7ada9433b8cd22"},"headline":"Sqoop Troubleshooting &#8211; 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