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12-20-2019
12:11 AM
The issue is not with HDFS, Its with hive metastore and posted the question here : https://community.cloudera.com/t5/Support-Questions/create-database-race-condition-in-Hive-metastore/td-p/286069
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12-03-2019
11:55 PM
Hi, can someone please provide me at least some insights to where to look further or should I raise this in apache hadoop community? My suspicion is delete is executing before the rename is complete which seems unlikely but that's the only possible explanation I can think of. I'm not able to validate my suspicion as this is not always reproducible, When this occurs Yarn usage goes 100% but not vice versa. appreciate your help Thanks, Satish Tvv.
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11-29-2019
02:28 AM
Hi,
we are using HDP( 3.1.0.0-78) launched via cloudbreak. we are using spark over HDFS for our ETL. In the flow sometimes spark table data is getting deleted. we are getting either PathNotFound error or empty data to the next spark query. Spark writes the files first to a jobStaging directory and renames the file to final destination after the job is completed (in job commit).
I can see the block deletion logs in corresponding datanode for those files.
The deletion logs looks something like this
2019-11-29 08:38:39,387 INFO impl.FsDatasetAsyncDiskService (FsDatasetAsyncDiskService.java:deleteAsync(225)) - Scheduling blk_1073817155_76331 replica FinalizedReplica, blk_1073817155_76331 , FINALIZED
2019-11-29 08:38:39,402 INFO impl.FsDatasetAsyncDiskService (FsDatasetAsyncDiskService.java:run(333)) - Deleted BP-640580566-10.99.135.34-1575013055635 blk_1073817155_76331 URI file:/hadoopfs/fs1/hdfs/datanode/current/BP-640580566-10.99.135.34-1575013055635/current/finalized/subdir1/subdir6/blk_1073817155
The following are the logs for the file to which this block belongs.
1)Following the log in hdfs-audit.log is the creation of file in task temporary directory.
grep part-00000-3d064e1e-f2ac-4b3f-a47f-f8e67095ed36-c000 hdfs-audit.log | grep create
2019-11-29 08:12:50,927 INFO FSNamesystem.audit: allowed=true ugi=livy (auth:SIMPLE) ip=/10.99.135.20 cmd= create src=/apps/spark/warehouse/temporal_engine__hive_intermediate_15489__full.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-12-32_852_6021558610039812629-11/-ext-10000/_temporary/0/_temporary/attempt_20191129081250_0185_m_000000_0/part-00000-3d064e1e-f2ac-4b3f-a47f-f8e67095ed36-c000 dst=null perm=livy:hdfs:rw-r--r-- proto=rpc callerContext=SPARK_TASK_application_1575013160270_0010_1_JId_135_SId_185_0_TId_9888_0
2)corresponding log for the HDFS block assigned for this file is
2019-11-29 08:12:50,929 INFO hdfs.StateChange (FSDirWriteFileOp.java:logAllocatedBlock(790)) - BLOCK* allocate blk_1073817155_76331, replicas=10.99.135.28:50010, 10.99.135.56:50010 for /apps/spark/warehouse/temporal_engine__hive_intermediate_15489__full.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-12-32_852_6021558610039812629-11/-ext-10000/_temporary/0/_temporary/attempt_20191129081250_0185_m_000000_0/ part-00000-3d064e1e-f2ac-4b3f-a47f-f8e67095ed36-c000
2019-11-29 08:12:50,963 INFO hdfs.StateChange (FSNamesystem.java:completeFile(2865)) - DIR* completeFile: /apps/spark/warehouse/temporal_engine__hive_intermediate_15489__full.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-12-32_852_6021558610039812629-11/-ext-10000/_temporary/0/_temporary/attempt_20191129081250_0185_m_000000_0/ part-00000-3d064e1e-f2ac-4b3f-a47f-f8e67095ed36-c000 is closed by DFSClient_attempt_20191129074726_0004_m_000000_0_-1065101445_33
3)Block creation log in one of the Datanode:
2019-11-29 08:12:50,931 INFO datanode.DataNode (DataXceiver.java:writeBlock(738)) - Receiving BP-640580566-10.99.135.34-1575013055635: blk_1073817155_76331 src: /10.99.135.20:34394 dest: /10.99.135.28:50010
2019-11-29 08:12:50,962 INFO DataNode.clienttrace (BlockReceiver.java:finalizeBlock(1533)) - src: /10.99.135.20:34394, dest: /10.99.135.28:50010, bytes: 306, op: HDFS_WRITE, cliID: DFSClient_attempt_20191129074726_0004_m_000000_0_-1065101445_33, offset: 0, srvID: f1fb608e-f140-4736-ab22-2314840beea5, blockid: BP-640580566-10.99.135.34-1575013055635: blk_1073817155_76331 , duration(ns): 17248141
2019-11-29 08:12:50,962 INFO datanode.DataNode (BlockReceiver.java:run(1506)) - PacketResponder: BP-640580566-10.99.135.34-1575013055635: blk_1073817155_76331 , type=HAS_DOWNSTREAM_IN_PIPELINE, downstreams=1:[10.99.135.56:50010] terminating
4)After the write & blocks is complete there are two rename commands to this file. (hdfs-autit.log)
a) first rename commiting from task directory to job staging directory:
2019-11-29 08:12:50,967 INFO FSNamesystem.audit: allowed=true ugi=livy (auth:SIMPLE) ip=/10.99.135.20 cmd= rename src=/apps/spark/warehouse/temporal_engine__hive_intermediate_15489__full.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-12-32_852_6021558610039812629-11/-ext-10000/_temporary/0/_temporary/attempt_20191129081250_0185_m_000000_0/part-00000-3d064e1e-f2ac-4b3f-a47f-f8e67095ed36-c000 dst=/apps/spark/warehouse/temporal_engine__hive_intermediate_15489__full.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-12-32_852_6021558610039812629-11/-ext-10000/part-00000-3d064e1e-f2ac-4b3f-a47f-f8e67095ed36-c000 perm=livy:hdfs:rw-r--r-- proto=rpc callerContext=SPARK_TASK_application_1575013160270_0010_1_JId_135_SId_185_0_TId_9888_0
b) second rename from job staging directory to final destination
2019-11-29 08:12:53,765 INFO FSNamesystem.audit: allowed=true ugi=livy (auth:SIMPLE) ip=/10.99.135.44 cmd= rename (options=[OVERWRITE]) src=/apps/spark/warehouse/temporal_engine__hive_intermediate_15489__full.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-12-32_852_6021558610039812629-11/-ext-10000/part-00000-3d064e1e-f2ac-4b3f-a47f-f8e67095ed36-c000 dst=/apps/spark/warehouse/temporal_engine__hive_intermediate_15489__full.db/milestones_repartition/part-00000-3d064e1e-f2ac-4b3f-a47f-f8e67095ed36-c000 perm=livy:hdfs:rw-r--r-- proto=rpc callerContext=SPARK_APPMASTER_application_1575013160270_0010_1
5)after this i don't see any requests for deleting this file or parent folder.
But at "2019-11-29 08:38:39,387" I can see Aysc block deletion logs in the corresponding datanodes
2019-11-29 08:38:39,387 INFO impl.FsDatasetAsyncDiskService (FsDatasetAsyncDiskService.java:deleteAsync(225)) - Scheduling blk_1073817155_76331 replica FinalizedReplica, blk_1073817155_76331 , FINALIZED
Posting all delete requests for this folder in hdfs-audit.log, there is no deletion request for the above blocks at that file
grep milestones_repartition hdfs-audit.log | grep delete
2019-11-29 08:12:53,733 INFO FSNamesystem.audit: allowed=true ugi=livy (auth:SIMPLE) ip=/10.99.135.44 cmd= delete src=/apps/spark/warehouse/temporal_engine__hive_intermediate_15489__full.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-12-32_852_6021558610039812629-11/-ext-10000/_temporary dst=null perm=null proto=rpc callerContext=SPARK_APPMASTER_application_1575013160270_0010_1
2019-11-29 08:12:53,742 INFO FSNamesystem.audit: allowed=true ugi=livy (auth:SIMPLE) ip=/10.99.135.44 cmd= delete src=/apps/spark/warehouse/temporal_engine__hive_intermediate_15489__full.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-12-32_852_6021558610039812629-11/-ext-10000/.spark-staging-3d064e1e-f2ac-4b3f-a47f-f8e67095ed36 dst=null perm=null proto=rpc callerContext=SPARK_APPMASTER_application_1575013160270_0010_1
2019-11-29 08:12:53,789 INFO FSNamesystem.audit: allowed=true ugi=livy (auth:SIMPLE) ip=/10.99.135.44 cmd= delete src=/apps/spark/warehouse/temporal_engine__hive_intermediate_15489__full.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-12-32_852_6021558610039812629-11 dst=null perm=null proto=rpc callerContext=SPARK_APPMASTER_application_1575013160270_0010_1
2019-11-29 08:14:56,929 INFO FSNamesystem.audit: allowed=true ugi=livy (auth:SIMPLE) ip=/10.99.135.70 cmd= delete src=/apps/spark/warehouse/temporal_engine__pre_dim_intermediate_15489.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-14-50_530_8634948911485589102-9/-ext-10000/_temporary dst=null perm=null proto=rpc callerContext=SPARK_APPMASTER_application_1575013160270_0081_1
2019-11-29 08:14:56,934 INFO FSNamesystem.audit: allowed=true ugi=livy (auth:SIMPLE) ip=/10.99.135.70 cmd= delete src=/apps/spark/warehouse/temporal_engine__pre_dim_intermediate_15489.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-14-50_530_8634948911485589102-9/-ext-10000/.spark-staging-abfb6223-6d5f-4909-a0ab-e725b2629f23 dst=null perm=null proto=rpc callerContext=SPARK_APPMASTER_application_1575013160270_0081_1
2019-11-29 08:14:56,972 INFO FSNamesystem.audit: allowed=true ugi=livy (auth:SIMPLE) ip=/10.99.135.70 cmd= delete src=/apps/spark/warehouse/temporal_engine__pre_dim_intermediate_15489.db/milestones_repartition/.hive-staging_hive_2019-11-29_08-14-50_530_8634948911485589102-9 dst=null perm=null proto=rpc callerContext=SPARK_APPMASTER_application_1575013160270_0081_1
This is not reproducible happen always.Please help me here, we are stuck with this interim issue.
Regards,
Satish Tvv.
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