CODEWITHSUNDEEP
hadoophbaseclouderaopentsdb
shubham003
shubham003

Reputation: 731

Monitoring HBase Cluster

I found out that Hbase provides various metrics which could be used to monitor the cluster and tune the configuration parameters for best performance. So can someone tell what does these metrics means and what are the most important metrics to consider?

Upvotes: 1

Views: 862

Answers (1)

Mukrram Rahman
Mukrram Rahman

Reputation: 426

Metric Name Explanation of value

hbase.regionserver.blockCacheCount

Block cache item count in memory. This is the number of blocks of StoreFiles (HFiles) in the cache.

hbase.regionserver.blockCacheEvictedCount

Number of blocks that had to be evicted from the block cache due to heap size constraints.

hbase.regionserver.blockCacheFree

Block cache memory available (bytes).

hbase.regionserver.blockCacheHitCachingRatio

Block cache hit caching ratio (0 to 100). The cache-hit ratio for reads configured to look in the cache (i.e., cacheBlocks=true).

hbase.regionserver.blockCacheHitCount

Number of blocks of StoreFiles (HFiles) read from the cache.

hbase.regionserver.blockCa
cheHitRatio

Block cache hit ratio (0 to 100). Includes all read requests, although those with cacheBlocks=false will always read from disk and be counted as a “cache miss.”

hbase.regionserver.blockCacheMissCount

Number of blocks of StoreFiles (HFiles) requested but not read from the cache.

hbase.regionserver.blockCacheSize

Block cache size in memory (bytes), that is, memory in use by the BlockCache.

hbase.regionserver.compactionQueueSize

Size of the compaction queue. This is the number of Stores in the RegionServer that have been targeted for compaction.

hbase.regionserver.flushQueueSize

Number of enqueued regions in the MemStore awaiting flush.

hbase.regionserver.fsReadLatency_avg_time

Filesystem read latency (ms). This is the average time to read from HDFS.

hbase.regionserver.fsReadLatency_num_ops

Filesystem read operations.

hbase.regionserver.memstoreSizeMB

Sum of all the memstore sizes in this RegionServer (MB). hbase.regionserver.regions Number of regions served by the RegionServer.

hbase.regionserver.requests

Total number of read and write requests. Requests correspond to RegionServer RPC calls; thus, a single Get will result in 1 request, but a Scan with caching set to 1,000

All these metrics have their own significance you can decide on your own after reading above given description of each metric.

Upvotes: 1

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