Hello, I want to check the status of each coprocessor, in a given table. Let's say I have 3 CPs and one of them is removed due to some unhandled exception, so I want to see this status (3 deployed, 2 currently alive).
I found this from http://blogs.apache.org/hbase/entry/coprocessor_introduction so my question is: 1. is the coprocessor shown in shell the actually live one, i.e., excluding those loaded but removed later? 2. is there a way to get it from Java API? 3. as far as I understand, during an un-handled exception, the coprocessorhost will remove this cp from ALL region servers, not only the server where the exception occurs? Is it correct? Thanks, Wei HBase Shell Coprocessor Status After a coprocessor has been configured, you also need to check the coprocessor status using the shell or master and region server web UIs to determine if the coprocessor has been loaded successfully. Shell command: hbase(main):018:0> alter 't1', METHOD => 'table_att', 'coprocessor'=>'|org.apache.hadoop.hbase.coprocessor.AggregateImplementation|1001|arg1=1,arg2=2' Updating all regions with the new schema... 1/1 regions updated. Done. 0 row(s) in 1.1060 seconds hbase(main):019:0> enable 't1' 0 row(s) in 2.0620 seconds hbase(main):020:0> status 'detailed' version 0.92-tm-6 0 regionsInTransition master coprocessors: [] 1 live servers localhost:52761 1328082515520 requestsPerSecond=3, numberOfOnlineRegions=3, usedHeapMB=32, maxHeapMB=995 -ROOT-,,0 numberOfStores=1, numberOfStorefiles=1, storefileUncompressedSizeMB=0, storefileSizeMB=0, memstoreSizeMB=0, storefileIndexSizeMB=0, readRequestsCount=54, writeRequestsCount=1, rootIndexSizeKB=0, totalStaticIndexSizeKB=0, totalStaticBloomSizeKB=0, totalCompactingKVs=0, currentCompactedKVs=0, compactionProgressPct=NaN, coprocessors=[] .META.,,1 numberOfStores=1, numberOfStorefiles=0, storefileUncompressedSizeMB=0, storefileSizeMB=0, memstoreSizeMB=0, storefileIndexSizeMB=0, readRequestsCount=97, writeRequestsCount=4, rootIndexSizeKB=0, totalStaticIndexSizeKB=0, totalStaticBloomSizeKB=0, totalCompactingKVs=0, currentCompactedKVs=0, compactionProgressPct=NaN, coprocessors=[] t1,,1328082575190.c0491168a27620ffe653ec6c04c9b4d1. numberOfStores=2, numberOfStorefiles=1, storefileUncompressedSizeMB=0, storefileSizeMB=0, memstoreSizeMB=0, storefileIndexSizeMB=0, readRequestsCount=0, writeRequestsCount=0, rootIndexSizeKB=0, totalStaticIndexSizeKB=0, totalStaticBloomSizeKB=0, totalCompactingKVs=0, currentCompactedKVs=0, compactionProgressPct=NaN, coprocessors=[AggregateImplementation] 0 dead servers If you cannot find the coprocessor loaded, you need to check the server log files to discover the reason for its failure to load.
