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documentation, see the <b><a href="/docs/troubleshooting">latest version</a></b> (<!-- -->0.14.1<!-- -->).</div></div><div class="docItemContainer_oiyr"><article><span class="theme-doc-version-badge badge badge--secondary">Version: <!-- -->0.10.0</span><div class="tocCollapsible_aw-L theme-doc-toc-mobile tocMobile_Tx6Y"><button type="button" class="clean-btn tocCollapsibleButton_zr6a">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Troubleshooting</h1></header><h2 class="anchor anchorWithStickyNavbar_y2LR" id="troubleshooting">Troubleshooting<a class="hash-link" href="#troubleshooting" title="Direct link to heading"></a></h2><p>Section below generally aids in debugging Hudi failures. Off the bat, the following metadata is added to every record to help triage issues easily using standard Hadoop SQL engines (Hive/PrestoDB/Spark)</p><ul><li><strong>_hoodie_record_key</strong> - Treated as a primary key within each DFS partition, basis of all updates/inserts</li><li><strong>_hoodie_commit_time</strong> - Last commit that touched this record</li><li><strong>_hoodie_file_name</strong> - Actual file name containing the record (super useful to triage duplicates)</li><li><strong>_hoodie_partition_path</strong> - Path from basePath that identifies the partition containing this record</li></ul><p>For performance related issues, please refer to the <a href="https://cwiki.apache.org/confluence/display/HUDI/Tuning+Guide" target="_blank" rel="noopener noreferrer">tuning guide</a></p><h3 class="anchor anchorWithStickyNavbar_y2LR" id="missing-records">Missing records<a class="hash-link" href="#missing-records" title="Direct link to heading"></a></h3><p>Please check if there were any write errors using the admin commands above, during the window at which the record could have been written. |
| If you do find errors, then the record was not actually written by Hudi, but handed back to the application to decide what to do with it.</p><h3 class="anchor anchorWithStickyNavbar_y2LR" id="duplicates">Duplicates<a class="hash-link" href="#duplicates" title="Direct link to heading"></a></h3><p>First of all, please confirm if you do indeed have duplicates <strong>AFTER</strong> ensuring the query is accessing the Hudi table <a href="/docs/querying_data">properly</a> .</p><ul><li>If confirmed, please use the metadata fields above, to identify the physical files & partition files containing the records .</li><li>If duplicates span files across partitionpath, then this means your application is generating different partitionPaths for same recordKey, Please fix your app</li><li>if duplicates span multiple files within the same partitionpath, please engage with mailing list. This should not happen. You can use the <code>records deduplicate</code> command to fix your data.</li></ul><h3 class="anchor anchorWithStickyNavbar_y2LR" id="spark-ui">Spark failures<a class="hash-link" href="#spark-ui" title="Direct link to heading"></a></h3><p>Typical upsert() DAG looks like below. Note that Hudi client also caches intermediate RDDs to intelligently profile workload and size files and spark parallelism. |
| Also Spark UI shows sortByKey twice due to the probe job also being shown, nonetheless its just a single sort.</p><figure><img class="docimage" src="/assets/images/hudi_upsert_dag-3b2d81de8560fad7af112e40a2f8c437.png" alt="hudi_upsert_dag.png"></figure><p>At a high level, there are two steps</p><p><strong>Index Lookup to identify files to be changed</strong></p><ul><li>Job 1 : Triggers the input data read, converts to HoodieRecord object and then stops at obtaining a spread of input records to target partition paths</li><li>Job 2 : Load the set of file names which we need check against</li><li>Job 3 & 4 : Actual lookup after smart sizing of spark join parallelism, by joining RDDs in 1 & 2 above</li><li>Job 5 : Have a tagged RDD of recordKeys with locations</li></ul><p><strong>Performing the actual writing of data</strong></p><ul><li>Job 6 : Lazy join of incoming records against recordKey, location to provide a final set of HoodieRecord which now contain the information about which file/partitionpath they are found at (or null if insert). Then also profile the workload again to determine sizing of files</li><li>Job 7 : Actual writing of data (update + insert + insert turned to updates to maintain file size)</li></ul><p>Depending on the exception source (Hudi/Spark), the above knowledge of the DAG can be used to pinpoint the actual issue. The most often encountered failures result from YARN/DFS temporary failures. |
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