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https://issues.apache.org/jira/browse/HBASE-14468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Rodionov updated HBASE-14468:
--------------------------------------
Description:
h2. FIFO Compaction
h3. Introduction
FIFO compaction policy selects only files which have all cells expired. The
column family MUST have non-default TTL.
Essentially, FIFO compactor does only one job: collects expired store files.
These are some applications which could benefit the most:
# Use it for very high volume raw data which has low TTL and which is the
source of another data (after additional processing). Example: Raw time-series
vs. time-based rollup aggregates and compacted time-series. We collect raw
time-series and store them into CF with FIFO compaction policy, periodically we
run task which creates rollup aggregates and compacts time-series, the
original raw data can be discarded after that.
# Use it for data which can be kept entirely in a a block cache (RAM/SSD). Say
we have local SSD (1TB) which we can use as a block cache. No need for
compaction of a raw data at all.
Because we do not do any real compaction, we do not use CPU and IO (disk and
network), we do not evict hot data from a block cache. The result: improved
throughput and latency both write and read.
See: https://github.com/facebook/rocksdb/wiki/FIFO-compaction-style
h3. To enable FIFO compaction policy
For table:
{code}
HTableDescriptor desc = new HTableDescriptor(tableName);
desc.setConfiguration(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY,
FIFOCompactionPolicy.class.getName());
{code}
For CF:
{code}
HColumnDescriptor desc = new HColumnDescriptor(family);
desc.setConfiguration(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY,
FIFOCompactionPolicy.class.getName());
{code}
Although region splitting is supported, for optimal performance it should be
disabled, either by setting explicitly DisabledRegionSplitPolicy or by setting
ConstantSizeRegionSplitPolicy and very large max region size. You will have to
increase to a very large number store's blocking file number :
*hbase.hstore.blockingStoreFiles* as well.
h3. Limitations
Do not use FIFO compaction if :
* Table/CF has MIN_VERSION > 0
* Table/CF has TTL = FOREVER (HColumnDescriptor.DEFAULT_TTL)
was:
h2. FIFO Compaction
h3. Introduction
FIFO compaction policy selects only files which have all cells expired. The
column family MUST have non-default TTL.
Essentially, FIFO compactor does only one job: collects expired store files. I
see many applications for this policy:
# Use it for very high volume raw data which has low TTL and which is the
source of another data (after additional processing). Example: Raw time-series
vs. time-based rollup aggregates and compacted time-series. We collect raw
time-series and store them into CF with FIFO compaction policy, periodically we
run task which creates rollup aggregates and compacts time-series, the
original raw data can be discarded after that.
# Use it for data which can be kept entirely in a a block cache (RAM/SSD). Say
we have local SSD (1TB) which we can use as a block cache. No need for
compaction of a raw data at all.
Because we do not do any real compaction, we do not use CPU and IO (disk and
network), we do not evict hot data from a block cache. The result: improved
throughput and latency both write and read.
See: https://github.com/facebook/rocksdb/wiki/FIFO-compaction-style
h3. To enable FIFO compaction policy
For table:
{code}
HTableDescriptor desc = new HTableDescriptor(tableName);
desc.setConfiguration(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY,
FIFOCompactionPolicy.class.getName());
{code}
For CF:
{code}
HColumnDescriptor desc = new HColumnDescriptor(family);
desc.setConfiguration(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY,
FIFOCompactionPolicy.class.getName());
{code}
Although region splitting is supported, for optimal performance it should be
disabled, either by setting explicitly DisabledRegionSplitPolicy or by setting
ConstantSizeRegionSplitPolicy and very large max region size. You will have to
increase to a very large number store's blocking file number :
*hbase.hstore.blockingStoreFiles* as well.
h3. Limitations
Do not use FIFO compaction if :
* Table/CF has MIN_VERSION > 0
* Table/CF has TTL = FOREVER (HColumnDescriptor.DEFAULT_TTL)
> Compaction improvements: FIFO compaction policy
> -----------------------------------------------
>
> Key: HBASE-14468
> URL: https://issues.apache.org/jira/browse/HBASE-14468
> Project: HBase
> Issue Type: Improvement
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
> Fix For: 2.0.0, 1.2.0, 1.3.0
>
> Attachments: HBASE-14468-v1.patch, HBASE-14468-v10.patch,
> HBASE-14468-v2.patch, HBASE-14468-v3.patch, HBASE-14468-v4.patch,
> HBASE-14468-v5.patch, HBASE-14468-v6.patch, HBASE-14468-v7.patch,
> HBASE-14468-v8.patch, HBASE-14468-v9.patch
>
>
> h2. FIFO Compaction
> h3. Introduction
> FIFO compaction policy selects only files which have all cells expired. The
> column family MUST have non-default TTL.
> Essentially, FIFO compactor does only one job: collects expired store files.
> These are some applications which could benefit the most:
> # Use it for very high volume raw data which has low TTL and which is the
> source of another data (after additional processing). Example: Raw
> time-series vs. time-based rollup aggregates and compacted time-series. We
> collect raw time-series and store them into CF with FIFO compaction policy,
> periodically we run task which creates rollup aggregates and compacts
> time-series, the original raw data can be discarded after that.
> # Use it for data which can be kept entirely in a a block cache (RAM/SSD).
> Say we have local SSD (1TB) which we can use as a block cache. No need for
> compaction of a raw data at all.
> Because we do not do any real compaction, we do not use CPU and IO (disk and
> network), we do not evict hot data from a block cache. The result: improved
> throughput and latency both write and read.
> See: https://github.com/facebook/rocksdb/wiki/FIFO-compaction-style
> h3. To enable FIFO compaction policy
> For table:
> {code}
> HTableDescriptor desc = new HTableDescriptor(tableName);
>
> desc.setConfiguration(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY,
> FIFOCompactionPolicy.class.getName());
> {code}
> For CF:
> {code}
> HColumnDescriptor desc = new HColumnDescriptor(family);
>
> desc.setConfiguration(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY,
> FIFOCompactionPolicy.class.getName());
> {code}
> Although region splitting is supported, for optimal performance it should be
> disabled, either by setting explicitly DisabledRegionSplitPolicy or by
> setting ConstantSizeRegionSplitPolicy and very large max region size. You
> will have to increase to a very large number store's blocking file number :
> *hbase.hstore.blockingStoreFiles* as well.
>
> h3. Limitations
> Do not use FIFO compaction if :
> * Table/CF has MIN_VERSION > 0
> * Table/CF has TTL = FOREVER (HColumnDescriptor.DEFAULT_TTL)
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